Exhibit 4.1

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                              TERRA CAPITAL, INC.,
                                   as Company,

                           THE GUARANTORS party hereto

                                       and

                         U.S. BANK NATIONAL ASSOCIATION,
                                   as Trustee

              11 1/2% Second Priority Senior Secured Notes due 2010

                              --------------------

                                    INDENTURE

                            Dated as of May 21, 2003

                              --------------------



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                                TABLE OF CONTENTS



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                                              ARTICLE 1

                             DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.1.   Definitions.......................................................................    1
SECTION 1.2.   Other Definitions.................................................................   29
SECTION 1.3.   Incorporation by Reference of Trust Indenture Act.................................   30
SECTION 1.4.   Rules of Construction.............................................................   30

                                              ARTICLE 2

                                              THE NOTES

SECTION 2.1.   Form and Dating...................................................................   31
SECTION 2.2.   Execution and Authentication......................................................   32
SECTION 2.3.   Registrar and Paying Agent........................................................   32
SECTION 2.4.   Paying Agent To Hold Money in Trust...............................................   33
SECTION 2.5.   Holder Lists......................................................................   33
SECTION 2.6.   Transfer and Exchange.............................................................   33
SECTION 2.7.   Replacement Notes.................................................................   35
SECTION 2.8.   Outstanding Notes.................................................................   35
SECTION 2.9.   Temporary Notes...................................................................   36
SECTION 2.10.  Cancellation......................................................................   36
SECTION 2.11.  Defaulted Interest................................................................   36
SECTION 2.12.  CUSIP Numbers.....................................................................   36
SECTION 2.13.  Restrictive Legends...............................................................   36
SECTION 2.14.  Special Transfer Provisions.......................................................   38

                                              ARTICLE 3

                                             REDEMPTION

SECTION 3.1.   Notices to Trustee................................................................   40
SECTION 3.2.   Selection of Notes To Be Redeemed.................................................   40
SECTION 3.3.   Notice of Redemption..............................................................   40
SECTION 3.4.   Effect of Notice of Redemption....................................................   41
SECTION 3.5.   Deposit of Redemption Price.......................................................   41
SECTION 3.6.   Notes Redeemed in Part............................................................   41

                                              ARTICLE 4

                                              COVENANTS

SECTION 4.1.   Payment of Notes..................................................................   42


                                      -i-





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SECTION 4.2.   Corporate Existence...............................................................   42
SECTION 4.3.   Maintenance of Office or Agency...................................................   42
SECTION 4.4.   Payment of Taxes and Other Claims.................................................   42
SECTION 4.5.   Additional Guarantees.............................................................   43
SECTION 4.6.   SEC Reports.......................................................................   43
SECTION 4.7.   Compliance Certificate............................................................   44
SECTION 4.8.   Change of Control.................................................................   44
SECTION 4.9.   Limitation on Incurrence of Indebtedness..........................................   45
SECTION 4.10.  Limitation on Restricted Payments.................................................   48
SECTION 4.11.  Limitation on Liens...............................................................   50
SECTION 4.12.  Limitation on Transactions with Affiliates........................................   50
SECTION 4.13.  Limitation on Asset Sales.........................................................   52
SECTION 4.14.  Limitation on Dividend and Other Restrictions Affecting Restricted Subsidiaries...   55
SECTION 4.15.  Limitation on Sale and Leaseback Transactions.....................................   56
SECTION 4.16.  Impairment of Security Interest...................................................   57
SECTION 4.17.  Conduct of Business...............................................................   57
SECTION 4.18.  Maintenance of Properties; Insurance; Compliance with Law.........................   57

                                              ARTICLE 5

                                          SUCCESSOR COMPANY

SECTION 5.1.   Merger, Consolidation and Sale of Assets..........................................   58

                                              ARTICLE 6

                                       DEFAULTS AND REMEDIES

SECTION 6.1.   Events of Default.................................................................   61
SECTION 6.2.   Acceleration......................................................................   64
SECTION 6.3.   Other Remedies....................................................................   64
SECTION 6.4.   Waiver of Past Defaults...........................................................   64
SECTION 6.5.   Control by Majority...............................................................   64
SECTION 6.6.   Limitation on Suits...............................................................   65
SECTION 6.7.   Rights of Holders To Receive Payment..............................................   65
SECTION 6.8.   Collection Suit by Trustee........................................................   65
SECTION 6.9.   Trustee May File Proofs of Claim..................................................   65
SECTION 6.10.  Priorities........................................................................   66
SECTION 6.11.  Undertaking for Costs.............................................................   66

                                              ARTICLE 7

                                               TRUSTEE

SECTION 7.1.   Duties of Trustee.................................................................   66
SECTION 7.2.   Rights of Trustee.................................................................   67


                                      -ii-





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SECTION 7.3.   Individual Rights of Trustee......................................................   69
SECTION 7.4.   Trustee's Disclaimer..............................................................   69
SECTION 7.5.   Notice of Defaults................................................................   69
SECTION 7.6.   Reports by Trustee to Holders.....................................................   69
SECTION 7.7.   Compensation and Indemnity........................................................   69
SECTION 7.8.   Replacement of Trustee............................................................   70
SECTION 7.9.   Successor Trustee by Merger.......................................................   71
SECTION 7.10.  Eligibility; Disqualification.....................................................   71
SECTION 7.11.  Preferential Collection of Claims Against Terra Capital...........................   71

                                              ARTICLE 8

                                   DISCHARGE OF INDENTURE; DEFEASANCE

SECTION 8.1.   Discharge of Liability on Notes; Defeasance.......................................   72
SECTION 8.2.   Conditions to Defeasance..........................................................   72
SECTION 8.3.   Application of Trust Money........................................................   74
SECTION 8.4.   Repayment to Terra Capital........................................................   74
SECTION 8.5.   Indemnity for Government Obligations..............................................   74
SECTION 8.6.   Reinstatement.....................................................................   74

                                              ARTICLE 9

                                        AMENDMENTS AND WAIVERS

SECTION 9.1.   Without Consent of Holders........................................................   74
SECTION 9.2.   With Consent of Holders...........................................................   75
SECTION 9.3.   Compliance with Trust Indenture Act...............................................   77
SECTION 9.4.   Revocation and Effect of Consents and Waivers.....................................   77
SECTION 9.5.   Notation on or Exchange of Notes..................................................   77
SECTION 9.6.   Trustee To Sign Amendments........................................................   77

                                              ARTICLE 10

                                              GUARANTEES

SECTION 10.1.  Guarantees........................................................................   77
SECTION 10.2.  Limitation on Liability...........................................................   79
SECTION 10.3.  Successors and Assigns............................................................   79
SECTION 10.4.  No Waiver.........................................................................   79
SECTION 10.5.  Modification......................................................................   80
SECTION 10.6.  Release of Guarantor..............................................................   80
SECTION 10.7.  Execution of Supplemental Indenture for Future Guarantors.........................   80
SECTION 10.8.  Joinder of Additional Guarantors..................................................   80


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                                              ARTICLE 11

                                             MISCELLANEOUS

SECTION 11.1.  Trust Indenture Act Controls......................................................   81
SECTION 11.2.  Notices...........................................................................   81
SECTION 11.3.  Communication by Holders with Other Holders.......................................   81
SECTION 11.4.  Certificate and Opinion as to Conditions Precedent................................   82
SECTION 11.5.  Statements Required in Certificate or Opinion.....................................   82
SECTION 11.6.  When Notes Disregarded............................................................   82
SECTION 11.7.  Rules by Trustee, Paying Agent and Registrar......................................   83
SECTION 11.8.  Legal Holidays....................................................................   83
SECTION 11.9.  Governing Law.....................................................................   83
SECTION 11.10. No Recourse Against Others........................................................   83
SECTION 11.11. Successors........................................................................   83
SECTION 11.12. Multiple Originals................................................................   83
SECTION 11.13. Table of Contents; Headings.......................................................   83
SECTION 11.14. Severability Clause...............................................................   83

                                              ARTICLE 12

                                         SECURITY DOCUMENTS

SECTION 12.1.  Security Documents; Additional Collateral.........................................   84
SECTION 12.2.  Recording, Etc....................................................................   85
SECTION 12.3.  Possession, Use and Release of Collateral.........................................   86
SECTION 12.4.  Trust Indenture Act Requirements..................................................   87
SECTION 12.5.  Suits To Protect the Collateral...................................................   87
SECTION 12.6.  Purchaser Protected...............................................................   88
SECTION 12.7.  Powers Exercisable by Receiver or Trustee.........................................   88
SECTION 12.8.  Disposition of Obligations Received...............................................   88
SECTION 12.9.  Determinations Relating to Collateral.............................................   88
SECTION 12.10. Renewal and Refunding.............................................................   89
SECTION 12.11. Release upon Termination of Issuer's Obligations..................................   89
SECTION 12.12. Casualty Events Relating to Collateral............................................   89

                                              ARTICLE 13

                                      APPLICATION OF TRUST MONIES

SECTION 13.1.  Trust Monies......................................................................   89
SECTION 13.2.  Retirement of Notes...............................................................   90
SECTION 13.3.  Withdrawals of Net Insurance Proceeds.............................................   91
SECTION 13.4.  Powers Exercisable Notwithstanding Event of Default...............................   92
SECTION 13.5.  Powers Exercisable by Trustee or Receiver.........................................   93
SECTION 13.6.  Disposition of Notes Retired......................................................   93
SECTION 13.7.  Investment of Trust Monies........................................................   93


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                                                                            Page
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Signatures................................................................   S-1

Exhibit A  -  Form of Note................................................   A-1
Exhibit B  -  Form of Exchange Note.......................................   B-1
Exhibit C  -  Form of Certificate To Be Delivered in Connection with
                 Transfers to Non-QIB Accredited Investors................   C-1
Exhibit D  -  Form of Certificate To Be Delivered in Connection with
                 Transfers Pursuant to Regulation S.......................   D-1
Exhibit E  -  Form of Guarantee...........................................   E-1
Exhibit F  -  Form of Supplemental Indenture..............................   F-1
Exhibit I  -  Forms of Security Agreement.................................   I-1

Note: This Table of Contents shall not, for any purpose, be deemed to be part of
the Indenture.

                                      -v-




                              CROSS-REFERENCE TABLE



TIA Section                                                                      Indenture Section
- -----------                                                                      -----------------
                                                                              
310(a)(1).................................................................       7.9; 7.10
   (a)(2).................................................................       7.10
   (a)(3).................................................................       N.A.
   (a)(4).................................................................       N.A.
   (b)....................................................................       7.8; 7.10
   (b)(1).................................................................       7.10
   (c)....................................................................       N.A.
311(a)....................................................................       7.11
   (b)....................................................................       7.11
312(a)....................................................................       2.5
   (b)....................................................................       2.5; 11.3
   (c)....................................................................       11.3
313(a)....................................................................       7.6
   (b)....................................................................       7.6
   (c)....................................................................       13.2
   (d)....................................................................       7.6
314(a)....................................................................       4.6; 4.7; 11.2
   (b)....................................................................       N.A.
   (c)(1).................................................................       11.4
   (c)(2).................................................................       11.4
   (c)(3).................................................................       N.A.
   (d)....................................................................       12.6
   (e)....................................................................       11.5
   (f)....................................................................       N.A.
315(a)....................................................................       7.1
   (b)....................................................................       7.5; 11.2
   (c)....................................................................       7.1
   (d)....................................................................       7.1
   (e)....................................................................       6.11
316(a)(last sentence).....................................................       11.6
   (a)(1)(A)..............................................................       6.5
   (a)(1)(B)..............................................................       6.4
   (a)(2).................................................................       N.A.
   (b)....................................................................       6.7
317(a)(1).................................................................       6.9
   (a)(2).................................................................       6.9
   (b)....................................................................       2.4
318(a)....................................................................       11.1


N.A. means Not Applicable.

Note: This Cross-Reference Table shall not, for any purpose, be deemed to be a
part of the Indenture.



          INDENTURE dated as of May 21, 2003, among TERRA CAPITAL, INC., a
Delaware corporation ("Terra Capital," "Issuer" or the "Company"), TERRA
INDUSTRIES INC., a Maryland corporation, as parent guarantor ("Parent"), certain
of Parent's subsidiaries party hereto (each a "Guarantor" and, collectively with
Parent, the "Guarantors") and U.S. BANK NATIONAL ASSOCIATION, a national banking
association, as trustee (the "Trustee").

          Each party agrees as follows for the benefit of the other parties and
for the equal and ratable benefit of the Holders of Terra Capital's 11 1/2%
Second Priority Senior Secured Notes due 2010:

                                   ARTICLE 1

                   DEFINITIONS AND INCORPORATION BY REFERENCE

          SECTION 1.1. Definitions.

          "Acquired Indebtedness" means (1) with respect to any Person that
becomes a Restricted Subsidiary after the Issue Date, Indebtedness of such
Person and its Subsidiaries existing at the time such Person becomes a
Restricted Subsidiary that was not incurred in connection with, or in
contemplation of, such Person becoming a Restricted Subsidiary and (2) with
respect to Parent or any Restricted Subsidiary, any Indebtedness of a Person
(other than Parent or a Restricted Subsidiary) existing at the time such Person
is merged with or into Parent or a Restricted Subsidiary, or Indebtedness
expressly assumed by Parent or any Restricted Subsidiary in connection with the
acquisition of an asset or assets from another Person, which Indebtedness was
not, in any case, incurred by such other Person in connection with, or in
contemplation of, such merger or acquisition.

          "Additional Notes" means any additional Notes having identical terms
and conditions to the Notes issued pursuant to Article 2 and in compliance with
Section 4.9.

          "affiliate" of any specified Person means any other Person, directly
or indirectly, controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any Person means the power to direct the
management and policies of such Person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise; and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.

          "After-Acquired Property" means (i) in the case of Issuer or any
Guarantor, any and all assets or property of the type constituting Collateral
acquired after the Issue Date including any assets or property of the type
constituting Collateral acquired by Issuer or any Guarantor from a transfer from
Issuer or a Guarantor and (ii) in the case of any Restricted Subsidiary that is
not a Guarantor, any and all assets or property of the type constituting
Collateral acquired after the Issue Date including any assets or property of the
type constituting Collateral acquired by such Restricted Subsidiary from a
transfer from any other Subsidiary.

          "amend" means amend, modify, supplement, restate or amend and restate,
including successively; and "amending" and "amended" have correlative meanings.



                                      -2-

          "asset" means any asset or property, whether real, personal or mixed,
tangible or intangible.

          "Asset Sale" means any Transfer by Parent or any Restricted Subsidiary
of:

          .    any shares of Capital Stock of a Restricted Subsidiary (other
               than directors' qualifying shares and, to the extent required by
               local ownership laws in foreign countries, shares owned by
               foreign shareholders);

          .    all or substantially all the assets of any division, business
               segment or comparable line of business of Parent or any
               Restricted Subsidiary; or

          .    any other assets of Parent or any Restricted Subsidiary outside
               of the ordinary course of business of Parent or such Restricted
               Subsidiary.

          Notwithstanding the foregoing, the term "Asset Sale" shall not
include:

          (1) for purposes of Section 4.13, a Transfer (a) that constitutes a
     Permitted Investment or a Restricted Payment permitted by Section 4.10 or
     (b) consummated in compliance with Section 5.1;

          (2) sales of accounts receivable of the type specified in the
     definition of "Qualified Securitization Transaction" to a Securitization
     Entity for the Fair Market Value thereof;

          (3) sales or grants of non-exclusive licenses to use the patents,
     trade secrets, know-how and other intellectual property of Parent or any
     Restricted Subsidiary to the extent that such licenses are granted in the
     ordinary course of business, and do not prohibit Parent or any Restricted
     Subsidiary from using the technologies licensed and do not require Parent
     or any Restricted Subsidiary to pay any fees for any such use;

          (4) a Transfer pursuant to any foreclosure of assets or other remedy
     provided by applicable law by a creditor of Parent or any Restricted
     Subsidiary with a Lien on such assets, if such Lien is permitted under this
     Indenture;

          (5) a Transfer involving only Temporary Cash Investments or inventory
     in the ordinary course of business;

          (6) any Transfer of damaged, worn-out or obsolete equipment in the
     ordinary course of business;

          (7) the lease or sublease of any real or personal property in the
     ordinary course of business; provided that, to the extent such property
     constitutes Collateral, such lease or sublease shall comply with the
     provisions of the applicable Security Documents;


                                      -3-

          (8) the sale at cost of equipment pursuant to a program in which
     participants agree to purchase or construct and maintain specific spare
     parts necessary to operate production facilities in the Permitted Business;
     or

          (9) a Transfer of assets having a Fair Market Value and a sale price
     of less than $1.0 million.

          "Attributable Debt" in respect of a Sale and Leaseback Transaction
means, as at the time of determination, the present value (discounted at the
implied interest rate in such transaction) of the total obligations of the
lessee for rental payments during the remaining term of the lease included in
such Sale and Leaseback Transaction (including any period for which such lease
has been extended).

          "Bank Collateral Agent" means the Person designated as such under the
Credit Facility or a Person otherwise performing the duties typical of a
collateral agent under a credit facility like the Credit Facility.

          "Basket" has the meaning set forth in Section 4.10.

          "Board of Directors" means the Board of Directors of Parent or any
committee thereof duly authorized to act on behalf of such Board under this
Indenture.

          "Business Day" means each day which is not a Legal Holiday.

          "Capital Lease Obligations" means an obligation that is required to be
classified and accounted for as a capital lease for financial reporting purposes
in accordance with GAAP. The amount of Indebtedness represented by such
obligation shall be the capitalized amount of such obligation determined in
accordance with GAAP, and the Stated Maturity thereof shall be the date of the
last payment of rent or any other amount due under such lease prior to the first
date upon which such lease may be terminated by the lessee without payment of a
penalty.

          "Capital Stock" of any Person means any and all shares, interests,
rights to purchase, warrants, options, participations or other equivalents of or
interests in (however designated) equity of such Person, including any Preferred
Stock, but excluding any debt securities convertible into such equity.

          "Casualty Event" shall mean, with respect to any property of any
Person, any loss of title with respect to such property or any loss of or damage
to or destruction of, or any condemnation or other taking (including by any
Governmental Authority) of, such property for which such Person or any of its
Subsidiaries receives insurance proceeds or proceeds of a condemnation award or
other compensation. "Casualty Event" shall include but not be limited to any
taking of all or any part of any property of any Person or any part thereof, in
or by condemnation or other eminent domain proceedings pursuant to any law, or
by reason of the temporary requisition of the use or occupancy of all or any
part of any property of any person or any part thereof by any Governmental
Authority, civil or military.



                                      -4-

          "Change of Control" means the occurrence of any of the following
events:

          (i)   Issuer ceases to be a Wholly Owned Subsidiary of Parent;

          (ii)  any "person" or "group" (as such terms are used in Sections
     13(d) and 14(d) of the Exchange Act), other than one or more Permitted
     Holders, is or becomes the beneficial owner (as defined in Rules 13d-3 and
     13d-5 under the Exchange Act, except that for purposes of this clause such
     person or group shall be deemed to have "beneficial ownership" of all
     securities that any such person or group has the right to acquire, whether
     such right is exercisable immediately or only after the passage of time),
     directly or indirectly, of Voting Stock representing 50% or more of the
     voting power of the total outstanding Voting Stock of Parent;

          (iii) during any period of two consecutive years, individuals who at
     the beginning of such period constituted the Board of Directors (together
     with any new directors whose election to the Board of Directors or whose
     nomination for election by the shareholders of Parent was approved by a
     vote of 66 2/3% of the directors of Parent then still in office who were
     either directors at the beginning of such period or whose election or
     nomination for election was previously so approved) cease for any reason to
     constitute a majority of the Board of Directors then in office;

          (iv)  Parent consolidates with or merges with or into another Person
     or another Person merges with or into Parent, or all or substantially all
     the assets of Parent and the Restricted Subsidiaries, taken as a whole, are
     Transferred to another Person (other than to a Person that is controlled by
     the Permitted Holders), and, in the case of any such merger or
     consolidation, the securities of Parent that are outstanding immediately
     prior to such transaction and which represent 100% of the aggregate voting
     power of the Voting Stock of Parent are changed into or exchanged for cash,
     securities or property, unless pursuant to such transaction such securities
     are changed into or exchanged for, in addition to any other consideration,
     securities of the surviving Person that represent, immediately after such
     transaction, at least a majority of the aggregate voting power of the
     Voting Stock of the surviving Person; or

          (v)   Parent or Issuer liquidates or dissolves or the stockholders of
     Parent adopt a plan of liquidation or dissolution.

          "Code" means the Internal Revenue Code of 1986, as amended.

          "Collateral" has the meaning assigned to such term in the applicable
Security Document.

          "Collateral Account" means the collateral account established pursuant
to Section 13.1.

          "Collateral Agent" has the meaning assigned to such term in the
applicable Security Document.

          "Collateral Permitted Liens" means the Liens permitted by Section
4.11(2).



                                      -5-

          "Commission" or "SEC" means the Securities and Exchange Commission.

          "Comparable Treasury Issue" means the United States Treasury security
selected by a Reference Treasury Dealer as having a maturity comparable to the
Stated Maturity of the principal of the Notes that would be utilized, at the
time of selection and in accordance with customary financial practice, in
pricing new issues of corporate debt securities of comparable maturity to the
remaining life of the Notes.

          "Comparable Treasury Price" means, with respect to any date of
redemption or purchase:

          .    the average of the bid and asked prices for the Comparable
               Treasury Issue (expressed in each case as a percentage of its
               principal amount) on the third business day preceding such date
               of redemption or purchase, as set forth in the daily statistical
               release (or any successor release) published by the Federal
               Reserve Bank of New York and designated "Composite 3:30 p.m.
               Quotations for U.S. Government Securities"; or

          .    if such release (or any successor release) is not published or
               does not contain such prices on such business day, the average of
               the Reference Treasury Dealer Quotations.

          "Consolidated Coverage Ratio" as of any date of determination means
the ratio of (i) the aggregate amount of EBITDA for the period of the most
recent four consecutive fiscal quarters for which internal financial statements
are available to (ii) Consolidated Fixed Charges for such four fiscal quarters;
provided that:

          (1)  if Parent or any Restricted Subsidiary has incurred any
     Indebtedness since the beginning of such period that remains outstanding on
     such date of determination or if the transaction giving rise to the need to
     calculate the Consolidated Coverage Ratio is an incurrence of Indebtedness,
     or both, EBITDA and Consolidated Fixed Charges for such period shall be
     calculated after giving effect on a pro forma basis to such Indebtedness as
     if such Indebtedness had been incurred on the first day of such period and
     the discharge of any other Indebtedness repaid, repurchased, defeased or
     otherwise discharged with the proceeds of such new Indebtedness as if such
     discharge had occurred on the first day of such period (except that, in the
     case of Indebtedness used to finance working capital needs incurred under a
     revolving credit or similar arrangement, the amount thereof shall be deemed
     to be the average daily balance of such Indebtedness during such
     four-fiscal-quarter period)

          (2)  if since the beginning of such period Parent or any Restricted
     Subsidiary shall have Transferred any assets outside the ordinary course of
     business, the EBITDA for such period shall be reduced by an amount equal to
     the EBITDA (if positive) directly attributable to the assets which are the
     subject of such Transfer for such period, or increased by an amount equal
     to the EBITDA (if negative) directly attributable thereto for such period,
     and Consolidated Fixed Charges for such period shall be reduced by an
     amount equal to the Consolidated Fixed Charges directly attributable to any
     Indebtedness of Parent or any Restricted Subsidiary



                                      -6-

     repaid, repurchased, defeased, assumed by a third person (to the extent
     Parent and its Restricted Subsidiaries are no longer liable for such
     Indebtedness) or otherwise discharged with respect to Parent and its
     continuing Restricted Subsidiaries in connection with such Transfer for
     such period (or, if the Capital Stock of any Restricted Subsidiary is sold,
     the Consolidated Fixed Charges for such period directly attributable to the
     Indebtedness of such Restricted Subsidiary to the extent Parent and its
     continuing Restricted Subsidiaries are no longer liable for such
     Indebtedness after such sale);

          (3)  if since the beginning of such period Parent or any Restricted
     Subsidiary (by merger or otherwise) shall have made an Investment in any
     Restricted Subsidiary (or any Person which becomes a Restricted Subsidiary)
     or an acquisition of assets, which acquisition constitutes all or
     substantially all of an operating unit of a business, including any such
     Investment or acquisition occurring in connection with a transaction
     requiring a calculation to be made hereunder, EBITDA and Consolidated Fixed
     Charges for such period shall be calculated after giving pro forma effect
     thereto (including the incurrence of any Indebtedness) as if such
     Investment or acquisition occurred on the first day of such period; and

          (4)  if since the beginning of such period any Person (that
     subsequently became a Restricted Subsidiary or was merged with or into
     Parent or any Restricted Subsidiary since the beginning of such period)
     shall have made any Transfer of assets outside the ordinary course of
     business, any Investment or acquisition of assets that would have required
     an adjustment pursuant to clause (2) or clause (3) above if made by Parent
     or a Restricted Subsidiary during such period, EBITDA and Consolidated
     Fixed Charges for such period shall be calculated after giving pro forma
     effect thereto as if such Transfer, Investment or acquisition occurred on
     the first day of such period.

          For purposes of this definition, whenever pro forma effect is to be
given to an acquisition of assets, the amount of income, earnings or expense
relating thereto and the amount of Consolidated Fixed Charges associated with
any Indebtedness incurred in connection therewith, the pro forma calculations
shall be prepared in accordance with Regulation S-X promulgated by the
Commission and after giving effect to any Pro Forma Cost Savings. If any
Indebtedness bears a floating rate of interest and is being given pro forma
effect, the interest of such Indebtedness shall be calculated as if the rate in
effect on the date of determination had been the applicable rate for the entire
period (taking into account any Interest Rate Agreement applicable to such
Indebtedness if such Interest Rate Agreement has a remaining term in excess of
12 months).

          "Consolidated Fixed Charges" means, with respect to any period, the
sum (without duplication) of:

          (i)  the interest expense of Parent and the Restricted Subsidiaries
     for such period, determined on a consolidated basis in accordance with GAAP
     consistently applied, including, without limitation, (a) amortization of
     debt issuance costs and debt discount, (b) the net payments, if any, under
     Interest Rate Agreements (including amortization of discounts), (c) the
     interest portion of any deferred payment obligation, (d) accrued interest
     and (e) commissions, discounts and other fees and charges incurred in
     respect of letters of credit or bankers' acceptance financings;



                                      -7-

          (ii)  the interest component of the Capital Lease Obligations paid or
     accrued during such period;

          (iii) all interest capitalized during such period;

          (iv)  interest accrued during such period on Indebtedness of the type
     described in clause (6) or (7) of the definition of "Indebtedness"; and

          (v)   the product of

                (x)  the amount of all dividends on any series of Preferred
                     Stock of Parent and the Restricted Subsidiaries (other than
                     dividends paid in Qualified Stock and other than dividends
                     paid to Parent or to a Restricted Subsidiary) paid, accrued
                     or scheduled to be paid or accrued during such period
                     times;

                (y)  a fraction, the numerator of which is one and the
                     denominator of which is one minus the then current
                     effective consolidated Federal, state and local tax rate of
                     Parent, expressed as a decimal;

excluding, however, any amount of such interest of any Restricted Subsidiary if
the net income (or loss) of such Restricted Subsidiary is excluded in the
calculation of Consolidated Net Income pursuant to clause (iii) of the proviso
in the definition thereof (but only in the same proportion as the net income (or
loss) of such Restricted Subsidiary is so excluded from the calculation of
Consolidated Net Income).

          "Consolidated Net Income" means, for any period, the net income (or
loss) of Parent and the Restricted Subsidiaries for such period, determined on a
consolidated basis in accordance with GAAP consistently applied; provided that
there shall not be included in such Consolidated Net Income:

          (i)   any extraordinary gains or extraordinary losses;

          (ii)  any net income or loss of any Person if such Person is not a
     Restricted Subsidiary, except that the equity of Parent or any Restricted
     Subsidiary in the net income of any such Person for such period shall be
     included in such Consolidated Net Income up to the aggregate amount of cash
     actually distributed by such Person during such period to Parent or a
     Restricted Subsidiary as a dividend or other distribution (subject, in the
     case of a dividend or other distribution paid to a Restricted Subsidiary,
     to the limitations contained in clause (iii) below);

          (iii) the net income of any Restricted Subsidiary to the extent that
     the declaration of dividends or similar distributions by that Restricted
     Subsidiary of that income is not at the time permitted, directly or
     indirectly, without prior approval (that has not been obtained), pursuant
     to the terms of its charter or any agreement, instrument and governmental
     regulation applicable to such Restricted Subsidiary or its stockholders;



                                      -8-

          (iv)  any gain or loss realized upon the sale or other disposition of
     (x) any assets (including pursuant to Sale and Leaseback Transactions)
     which are not sold or otherwise disposed of in the ordinary course of
     business or (y) any Capital Stock of any Person; and

          (v)   the cumulative effect of a change in accounting principles;

provided further that Consolidated Net Income shall be reduced by the product of
(x) the amount of all dividends on Designated Preferred Stock (other than
dividends paid in Qualified Stock and other than dividends paid to Parent or to
a Restricted Subsidiary) paid, accrued or scheduled to be paid or accrued during
such period times (y) a fraction, the numerator of which is one and the
denominator of which is one minus the then current effective consolidated
Federal, state and local tax rate of Parent, expressed as a decimal.

          "Consolidated Net Worth" means, with respect to any Person on any
date, the equity of the common and preferred stockholders of such Person and its
Restricted Subsidiaries as of such date, determined on a consolidated basis in
accordance with GAAP consistently applied, less any amount attributable to
Unrestricted Subsidiaries.

          "Contested Liens" shall have the meaning assigned to such term in the
applicable Security Document.

          "Corporate Trust Office" means the office of the Trustee located at
180 East Fifth Street, St. Paul, Minnesota 55101; provided that corporate trust
office or Trustee's Office located in New York shall mean the office of the
Trustee located at 100 Wall Street, Suite 1600, New York, New York 10005.

          "Coverage Ratio Exception" has the meaning set forth in the proviso in
Section 4.9(a).

          "Credit Facility" means one or more unsubordinated credit agreements,
including the Amended and Restated Revolving Credit Agreement dated October 10,
2001 (as amended, including on June 1, 2002 and on or about the Issue Date)
among Issuer, Terra UK, TNLP, the guarantors party thereto, the lenders party
thereto and Citicorp USA, Inc., as administrative agent, including any notes,
guarantees, collateral and security documents (including mortgages, pledge
agreements and other security arrangements), instruments and agreements executed
in connection therewith, and in each case as amended or Refinanced from time to
time, including any agreement or agreements extending the maturity of, or
Refinancing (including increasing the amount of borrowings or other Indebtedness
outstanding or available to be borrowed thereunder), all or any portion of the
Indebtedness under such agreement, and any successor or replacement agreement or
agreements with the same or any other agents, creditor, lender or group of
creditors or lenders.

          "Credit Facility Obligations" means (i) all Indebtedness outstanding
under any Credit Facility, (ii) all other Obligations of Issuer or any Guarantor
under or with respect to the Credit Facility, including, without limitation,
Obligations in respect of cash management services or Hedging Obligations that
are included as Obligations under and as defined in any Credit Facility, and
(iii) all other Obligations of the Issuer or any Guarantor in respect of cash
management services or Hedging Obliga-



                                      -9-

ations that (pursuant to this clause (iii)) are designated by Issuer to be
Credit Facility Obligations for the purposes of this Indenture.

          "Currency Agreement" means, with respect to any Person, any foreign
exchange contract, currency swap agreement or other similar agreement to which
such Person is a party or a beneficiary.

          "Default" means any event which is, or after notice or passage of time
or both would be, an Event of Default.

          "Depository" means The Depository Trust Company, its nominees and
their respective successors.

          "Designated Preferred Stock" means preferred stock of Parent that is
designated as Designated Preferred Stock pursuant to an officers' certificate
executed by the principal executive officer and the principal financial officer
of Parent on the issuance date thereof, the Net Cash Proceeds of which do not
increase the Basket and are not used for purposes of Section 4.10(b)(2).

          "Discharge" means, with respect to the Credit Facility Obligations,
the payment in full in cash of the principal of, premium, if any, and interest
on all Credit Facility Obligations and, with respect to Hedging Obligations or
letters of credit outstanding thereunder, delivery of cash collateral or
backstop letters of credit in respect thereof in compliance with the Credit
Facility, in each case after or concurrently with termination of all commitments
thereunder, and payment in full in cash of any other Credit Facility Obligations
that are due and payable at or prior to the time such principal, premium and
interest are paid.

          "Disqualified Stock" means, with respect to any Person, any Capital
Stock which by its terms (or by the terms of any security into which it is
convertible or for which it is exchangeable) or upon the happening of any event:

          (i)  matures or is mandatorily redeemable pursuant to a sinking fund
     obligation or otherwise; or

          (ii) is redeemable at the option of the holder thereof, in whole or in
     part, in each case on or prior to the date that is 91 days after the Stated
     Maturity of the Notes;

provided that any class of Capital Stock of such Person that, by its terms,
authorizes such Person to satisfy in full its obligations with respect to the
payment of dividends or upon maturity, redemption (pursuant to a sinking fund or
otherwise) or repurchase thereof or otherwise by the delivery of Qualified
Stock, and that is not convertible, puttable or exchangeable for Disqualified
Stock or Indebtedness, will not be deemed to be Disqualified Stock so long as
such Person satisfies its obligations with respect thereto solely by the
delivery of Qualified Stock; provided further that any Capital Stock that would
not constitute Disqualified Stock but for provisions thereof giving holders
thereof (or the holders of any security into or for which such Capital Stock is
convertible, exchangeable or exercisable) the right to require Parent or any
Restricted Subsidiary to redeem or purchase such Capital Stock upon the
occurrence of a change in control occurring prior to the final maturity date of
the Notes shall not



                                      -10-

constitute Disqualified Stock if the change in control provisions applicable to
such Capital Stock are no more favorable to such holders than Section 4.8 and
such Capital Stock specifically provides that Parent or such Restricted
Subsidiary will not redeem or purchase any such Capital Stock pursuant to such
provisions prior to Issuer's purchase of the Notes as required pursuant to
Section 4.8.

          "Domestic Subsidiary" means a Restricted Subsidiary of Parent that is
not a Foreign Subsidiary.

          "EBITDA" for any period means the sum of Consolidated Net Income for
such period plus, without duplication, the following to the extent deducted in
calculating such Consolidated Net Income:

          (i)   Consolidated Fixed Charges;

          (ii)  income tax expense determined on a consolidated basis in
     accordance with GAAP;

          (iii) depreciation expense determined on a consolidated basis in
     accordance with GAAP;

          (iv)  amortization expense determined on a consolidated basis in
     accordance with GAAP;

          (v)   minority interest; and

          (vi)  all other non-cash items reducing such Consolidated Net Income
     (excluding (x) any non-cash item to the extent that it represents an
     accrual of, or reserve for, cash disbursements to be made in any subsequent
     period and (y) the amount attributable to minority interests) for such
     period;

provided that EBITDA shall be reduced by the following:

          (a)   all non-cash items increasing such Consolidated Net Income
     (excluding (x) any non-cash item to the extent that it represents an
     accrual of cash receipts to be received in a subsequent period and (y) the
     amount attributable to minority interests); and

          (b)   amounts paid as dividends or distributions to any Person other
     than Parent or any Restricted Subsidiary.

          Notwithstanding the foregoing, the provision for taxes based on the
income or profits of, and the depreciation and amortization of, a Subsidiary of
Parent shall be added to Consolidated Net Income to compute EBITDA only to the
extent (and in the same proportion) that the net income of such Subsidiary was
included in calculating Consolidated Net Income and only if a corresponding
amount would be permitted at the date of determination to be dividended or
otherwise distributed to Parent by such Subsidiary without prior approval (that
has not been obtained), pursuant to the terms of its charter and all agreements,
instruments and governmental regulations applicable to such Subsidiary or its
stockholders.



                                      -11-

          "Equity Offering" means a public offering or private placement of
Capital Stock of Parent or Issuer (other than Disqualified Stock) that generates
gross proceeds to the issuer thereof of at least $50.0 million.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended.

          "Exchange and Registration Rights Agreement" has the meaning set forth
under "Exchange Offer; Registration Rights."

          "Exchange Notes" means the 11 1/2% Second Priority Senior Secured
Notes due 2010 to be issued in exchange for the Initial Notes pursuant to the
Registration Rights Agreement.

          "Fair Market Value" means, with respect to any asset, the price (after
taking into account any liabilities relating to such assets) that would be
negotiated in an arm's-length transaction for cash between a willing seller and
a willing and able buyer, neither of which is under any compulsion to complete
the transaction. Fair Market Value (other than of any asset with a public
trading market) in excess of $5.0 million shall be determined by the Board of
Directors acting reasonably and in good faith and shall be evidenced by a board
resolution delivered to the Trustee. Fair Market Value (other than of any asset
with a public trading market) in excess of $15.0 million shall be determined by
an Independent Financial Advisor, which determination shall be evidenced by an
opinion delivered to the Trustee.

          "Foreign Subsidiary" means a Restricted Subsidiary that is
incorporated in a jurisdiction other than the United States or a State thereof
or the District of Columbia and with respect to which a majority of its sales
(determined on a consolidated basis in accordance with GAAP) is generated from
or derived from operations outside the United States of America and a majority
of its assets is located outside the United States of America.

          "GAAP" means generally accepted accounting principles in the United
States of America as in effect on the date hereof, except that Statement of
Financial Accounting Statements No. 142, "Goodwill and Other Intangible Assets,"
shall be given effect when adopted by Parent and its Subsidiaries.

          "Governmental Authority" shall mean any federal, state, local or
foreign court, central bank or governmental agency, authority, instrumentality
or regulatory body.

          "guarantee" means any obligation, contingent or otherwise, of any
Person directly or indirectly guaranteeing any Indebtedness or other obligation
of any Person and any obligation, direct or indirect, contingent or otherwise,
of such Person:

          (1)   to purchase or pay (or advance or supply funds for the purchase
     or payment of) such Indebtedness or other obligation of such Person
     (whether arising by virtue of partnership arrangements, or by agreements to
     keep-well, to purchase assets, goods, securities or services, to
     take-or-pay or to maintain financial statement conditions or otherwise); or



                                      -12-

          (2)   entered into for the purpose of assuring in any other manner the
     obligee of such Indebtedness or other obligation of the payment thereof or
     to protect such obligee against loss in respect thereof (in whole or in
     part);

provided that the term "guarantee" shall not include endorsements for collection
or deposit in the ordinary course of business. The term "guarantee" used as a
verb has a corresponding meaning. The term "guarantor" shall mean any Person
guaranteeing any obligation.

          "Guarantee" means a full and unconditional senior guarantee of the
Notes pursuant to Article 10, secured pursuant to the Security Documents.

          "Guarantor" means (i) each of Beaumont Ammonia Inc., a Delaware
corporation; Beaumont Holdings Corporation, a Delaware corporation; BMC Holdings
Inc., a Delaware corporation; Port Neal Corporation, a Delaware corporation;
Terra (UK) Holdings Inc., a Delaware corporation; Terra Capital Holdings, Inc.,
a Delaware corporation; Terra Industries Inc., a Maryland corporation; Terra
International (Oklahoma) Inc., a Delaware corporation; Terra International,
Inc., a Delaware corporation; Terra Methanol Corporation, a Delaware
corporation; Terra Nitrogen Corporation, a Delaware corporation; and Terra Real
Estate Corp., an Iowa corporation, and (ii) any other Restricted Subsidiary of
Parent that issues a Guarantee of the Notes, in each case, until such Person is
released from its Guarantee in accordance with Section 10.6.

          "Hedging Obligations" of any Person means the obligations of such
Person pursuant to any Interest Rate Agreement or Currency Agreement entered
into in the ordinary course of business and not for speculative purposes.

          "Holder" or "Noteholder" means the Person in whose name a Note is
registered on the Registrar's books.

          "incur" means issue, create, assume, guarantee, incur or otherwise
become liable for; provided that any Indebtedness or Capital Stock of a Person
existing at the time such Person becomes a Restricted Subsidiary (whether by
merger, consolidation, acquisition or otherwise) shall be deemed to be incurred
by such Subsidiary at the time it becomes a Restricted Subsidiary. Neither the
accrual of interest nor the accretion of original issue discount shall be
considered an incurrence of Indebtedness. The term "incurrence" when used as a
noun shall have a correlative meaning.

          "Indebtedness" means, with respect to any Person, without duplication,
and whether or not contingent:

          (1)   all indebtedness of such Person for borrowed money or for the
     deferred purchase price of assets or services or which is evidenced by a
     note, bond, debenture or similar instrument, to the extent it would appear
     as a liability upon a balance sheet of such Person prepared in accordance
     with GAAP;

          (2)   all Capital Lease Obligations of such Person;



                                      -13-

          (3)   all obligations of such Person in respect of letters of credit
     or bankers' acceptances issued or created for the account of such Person;

          (4)   net obligations of such Person under Interest Rate Agreements or
     Currency Agreements;

          (5)   all Disqualified Stock issued by such Person and all preferred
     stock issued by any Subsidiary of such Person, in each case, valued at the
     greater of its voluntary or involuntary maximum fixed repurchase price plus
     accrued and unpaid dividends thereon;

          (6)   to the extent not otherwise included, any guarantee by such
     Person of any other Person's indebtedness or other obligations described in
     clauses (1) through (5) above; and

          (7)   all Indebtedness of others secured by a Lien on any asset of
     such Person, whether or not such Indebtedness is assumed by such Person;
     provided that the amount of such Indebtedness shall be the lesser of (x)
     the Fair Market Value of such asset at such date of determination and (y)
     the amount of such Indebtedness.

          For the avoidance of doubt, "Indebtedness" shall not include:

          (a)   current trade payables incurred in the ordinary course of
     business and payable in accordance with customary practices;

          (b)   deferred tax obligations;

          (c)   minority interest;

          (d)   uncapitalized interest;

          (e)   non-interest bearing installment obligations and accrued
     liabilities incurred in the ordinary course of business; and

          (f)   obligations of Parent or any Restricted Subsidiary pursuant to
     contracts for, or options, puts or similar arrangements relating to, the
     purchase of raw materials or the sale of inventory at a time in the future
     entered into in the ordinary course of business.

For purposes hereof, the "maximum fixed repurchase price" of any Disqualified
Stock which does not have a fixed repurchase price shall be calculated in
accordance with the terms of such Disqualified Stock as if such Disqualified
Stock were purchased on any date on which Indebtedness shall be required to be
determined pursuant to this Indenture, and if such price is based upon, or
measured by the Fair Market Value of, such Disqualified Stock, such Fair Market
Value is to be determined in good faith by the board of directors of the issuer
of such Disqualified Stock. The amount of Indebtedness of any Person at any date
shall be the outstanding balance at such date of all unconditional obligations
as described above and the maximum liability, upon the occurrence of the
contingency giving rise to the obligation, of any contingent obligations as
described above at such date; provided that the amount outstanding at any time
of any Indebtedness issued with original issue discount shall be deemed to be



                                  -14-

the face amount of such Indebtedness less the remaining unamortized portion of
the original issue discount of such Indebtedness at such time as determined in
conformity with GAAP.

          "Indenture" means this Indenture as amended or supplemented from time
to time by one or more supplemental indentures entered into pursuant to the
applicable provisions hereof or otherwise in accordance with the terms hereof.

          "Independent Financial Advisor" means a firm (i) which does not, and
whose directors, officers or Affiliates do not, have a material financial
interest in Parent or any of its Subsidiaries; and (ii) which, in the judgment
of the Board of Directors, is otherwise independent and qualified to perform the
task for which it is to be engaged.

          "Initial Notes" means the 11 1/2% Second Priority Senior Secured Notes
due 2010 of Terra Capital originally issued on the Issue Date.

          "Initial Purchasers" means, collectively, Citigroup Global Markets
Inc. and Credit Suisse First Boston LLC.

          "Intercreditor Agreement" means the intercreditor agreement dated as
of the date hereof entered into among the Trustee, the trustee for the 2008
Notes, the agent under the Credit Facility, Issuer and certain Guarantors, with
respect to the Collateral, as amended (including any amendment and restatement
thereof), supplemented or otherwise modified from time to time.

          "interest" means, with respect to the Notes, the sum of any interest
and any Liquidated Damages on the Notes.

          "Interest Rate Agreement" means any interest rate swap agreement,
interest rate cap agreement or other similar financial agreement or arrangement.

          "Investment" in any Person means any direct or indirect advance, loan
or other extension of credit (including by way of guarantee or similar
arrangement) or capital contribution to, or any purchase or acquisition of
Capital Stock, Indebtedness or other similar instruments issued by, such Person.
"Investment" excludes (a) any Restricted Payment of the type described in clause
(ii) of the definition thereof and (b) any purchase or acquisition of
Indebtedness of Parent or any of its Subsidiaries.

          For purposes of the definition of "Unrestricted Subsidiary," the
definition of "Restricted Payment" and Section 4.10:

          (i)  "Investment" shall include the portion (proportionate to Parent's
     direct and indirect equity interest in such Subsidiary) of the Fair Market
     Value of the net assets of any Restricted Subsidiary at the time that such
     Restricted Subsidiary is designated an Unrestricted Subsidiary;

          (ii) any asset Transferred to or from an Unrestricted Subsidiary shall
     be valued at its Fair Market Value at the time of such Transfer; and



                                      -15-

          (iii) if Parent or any Restricted Subsidiary Transfers any Capital
     Stock of any direct or indirect Restricted Subsidiary, or any Restricted
     Subsidiary issues Capital Stock, such that, after giving effect to any such
     Transfer or issuance, such Person is no longer a Restricted Subsidiary,
     Parent shall be deemed to have made an Investment on the date of any such
     Transfer or issuance equal to the Fair Market Value of the Capital Stock of
     such Person held by Parent or such Restricted Subsidiary immediately
     following any such Transfer or issuance.

          "Issue Date" means May 21, 2003.

          "Issuer Surviving Entity" has the meaning set forth in Section 5.1.

          "Lien" means, with respect to any asset, any mortgage, deed of trust,
lien, pledge, charge, debenture, security interest or encumbrance of any kind in
respect of such asset, whether or not filed, recorded or otherwise perfected
under applicable law (including any conditional sale or other title retention
agreement, any lease in the nature thereof, any option or other agreement to
sell or give a security interest in any asset and any filing of, or agreement to
give, any financing statement under the UCC or equivalent statutes) of any
jurisdiction other than to evidence a lease.

          "Liquidated Damages" has the meaning set forth in paragraph 8 of the
Initial Notes.

          "Make Whole Amount" means the excess, if any, of (i) an amount equal
to the sum of the present values of the remaining scheduled payments of
principal of the Notes to be redeemed or purchased and the scheduled payment of
interest thereon to originally scheduled maturity, discounted to the redemption
or purchase date (assuming a 360-day year consisting of twelve 30-day months) at
the Special Adjusted Treasury Rate from the respective dates on which such
principal and interest would have been payable over (ii) the principal amount of
the Notes being redeemed or purchased.

          "Net Available Proceeds" from an Asset Sale means the aggregate cash
proceeds received by such Person and/or its affiliates in respect of such
transaction, which amount is equal to the excess, if any, of:

          (i)   the cash received by such Person and/or its affiliates
     (including any cash payments received by way of deferred payment pursuant
     to, or monetization of, a note or installment receivable or otherwise, but
     only as and when received) in connection with such transaction, over

          (ii)  the sum of (a) the amount of any Indebtedness that is secured by
     such asset and which is required to be repaid by such Person in connection
     with such transaction, plus (b) all fees, commissions, and other expenses
     incurred by such Person in connection with such transaction, plus (c)
     provision for taxes, including income taxes, attributable to the
     transaction or attributable to required prepayments or repayments of
     Indebtedness with the proceeds of such transaction, plus (d) a reasonable
     reserve for the after-tax cost of any indemnification payments (fixed or
     contingent) attributable to seller's indemnities to purchaser in respect of
     such transaction undertaken by Parent or any of its Restricted Subsidiaries
     in connection with such transaction, plus (e) if such Person is a
     Restricted Subsidiary, any dividends or distribu-



                                      -16-

     tions payable to holders of minority interests in such Restricted
     Subsidiary from the proceeds of such transaction.

          "Net Cash Proceeds," with respect to any issuance or sale of Capital
Stock, means the cash proceeds of such issuance or sale net of attorneys' fees,
accountants' fees, underwriters' or placement agents' fees, discounts or
commissions and brokerage, consultant and other fees actually incurred in
connection with such issuance or sale and net of taxes paid or payable as a
result thereof.

          "Non-U.S. Person" means a Person who is not a U.S. Person, as defined
in Regulation S.

          "Notes" means the Initial Notes and the Exchange Notes.

          "Obligations" means, with respect to any Indebtedness, any principal,
interest, penalties, fees, indemnification, reimbursements, costs, expenses,
damages and other liabilities payable under the documentation governing such
Indebtedness.

          "Offering Memorandum" means the offering memorandum, dated May 16,
2003, relating to the Initial Notes.

          "Officer" means, with respect to Parent, the Chairman of the Board,
any Vice Chairman, the Chief Executive Officer, the Chief Financial Officer, the
President, any Executive Vice President or Vice President, the Secretary or any
Assistant Secretary.

          "Officers' Certificate" means, with respect to any Person, a
certificate signed by two Officers, one of which is the Chairman of the Board,
the Chief Executive Officer, the Chief Financial Officer, the President or any
Executive Vice President.

          "Opinion of Counsel" means a written opinion from legal counsel who is
reasonably acceptable to the Trustee. The counsel may be an employee of or
counsel to Parent or the Trustee.

          "Parent Surviving Entity" has the meaning set forth in Section 5.1.

          "Permitted Business" means (i) the same or a similar line of business
as Parent and the Restricted Subsidiaries are engaged in on the date hereof as
described in the Offering Memorandum and (ii) such business activities as are
complementary, incidental, ancillary or related to, or are reasonable extensions
of, the foregoing.

          "Permitted Holders" means Anglo American plc, an English public
limited company, and its affiliates.

          "Permitted Indebtedness" has the meaning set forth in Section 4.9(b).

          "Permitted Investment" means:

          (1) any Investment in Temporary Cash Investments or the Notes or the
     Exchange Notes;



                                      -17-

          (2)  any Investment in Issuer or any Guarantor;

          (3)  any Investment by Parent or any Restricted Subsidiary in a
     Person, if as a result of such Investment: (x) such Person becomes a
     Guarantor; or (y) such Person is merged or consolidated with or into, or
     Transfers or conveys all or substantially all of its assets to, or is
     liquidated into, Issuer or a Guarantor;

          (4)  any Investment by any Foreign Subsidiary in (x) any other Foreign
     Subsidiary; or (y) any Person, if as a result of such Investment, (x) such
     Person becomes a Foreign Subsidiary, or (y) such Person is merged or
     consolidated with or into, or Transfers or conveys all or substantially all
     of its assets to, or is liquidated into, any Foreign Subsidiary;

          (5)  receivables owing to Parent or any Restricted Subsidiary if
     created or acquired in the ordinary course of business and payable or
     dischargeable in accordance with customary trade terms; provided that such
     trade terms may include such concessionary trade terms as Parent or any
     such Restricted Subsidiary deems reasonable under the circumstances;

          (6)  loans or advances to employees of Parent or any Restricted
     Subsidiary that are made in the ordinary course of business consistent with
     past practices of Parent or such Restricted Subsidiary;

          (7)  Investments in any Person to the extent such Investment
     represents the non-cash portion of the consideration received in an Asset
     Sale as permitted pursuant Section 4.13;

          (8)  Investments of cash or Temporary Cash Investments in any
     Restricted Subsidiary that is not a Guarantor in the form of Indebtedness
     that is not subordinated by its terms to any other obligations;

          (9)  Investments in securities of trade creditors or customers
     received pursuant to any plan of reorganization or similar arrangement upon
     the bankruptcy or insolvency of such trade creditors or customers;

          (10) Hedging Obligations incurred pursuant to clause (7) of the
     definition of "Permitted Indebtedness";

          (11) Investments in joint ventures not to exceed $10.0 million at any
     time outstanding; provided that each such joint venture is engaged only in
     a Permitted Business;

          (12) any Investment by Parent or a Wholly Owned Subsidiary of Parent
     in a Securitization Entity; provided that such Investment is in the form of
     a Purchase Money Note or an equity interest or interests in accounts
     receivable generated by Parent or any of its Subsidiaries;

          (13) any Indebtedness of Parent to any of its Subsidiaries incurred in
     connection with the purchase of accounts receivable and related assets by
     Parent from any such Subsidi-



                                      -18-

     ary which assets are subsequently conveyed by Parent to a Securitization
     Entity in a Qualified Securitization Transaction;

          (14) any guarantees of Indebtedness permitted by clause (6) or (17) of
     the definition of "Permitted Indebtedness";

          (15) any Investment by TNCLP or TNLP in the other; and

          (16) additional Investments in an aggregate amount not to exceed $10.0
     million at any time outstanding.

          The amount of any Investments outstanding for purposes of clause (11)
or (16) above and the amount of Investments deemed made since the Issue Date for
purposes of Section 4.10(b) shall be equal to the aggregate amount of
Investments made pursuant to such clause reduced (but not below zero) by the
following (to the extent not included in the calculation of Consolidated Net
Income for purposes of determining the Basket and without duplication):

          (a)  the aggregate net proceeds (including the Fair Market Value of
     assets other than cash) received by Parent or any Restricted Subsidiary
     upon the sale or other disposition of any Investment made pursuant to such
     clause;

          (b)  the net reduction in Investments made pursuant to such clause
     resulting from dividends, repayments of loans or advances or other
     Transfers of assets to Parent or any Restricted Subsidiary;

          (c)  to the extent that the amount available for Investments under
     such clause was reduced as the result of the designation of an Unrestricted
     Subsidiary, the portion (proportionate to Parent's equity interest in such
     Subsidiary) of the Fair Market Value of the net assets of such Unrestricted
     Subsidiary at the time such Unrestricted Subsidiary is redesignated, or
     liquidated or merged into, a Restricted Subsidiary; and

          (d)  the net reduction in Investments made pursuant to such clause
     resulting from repayment of letters of credit or the expiration of letters
     of credit undrawn.

          "Permitted Liens" means:

          (1)  Liens on the Collateral created pursuant to the terms of the
     Security Documents securing obligations under this Indenture, the Notes,
     the Guarantees, the 2008 Notes, the Indenture governing the 2008 Notes, the
     guarantees of the 2008 Notes and the Security Documents in favor of the
     Trustee;

          (2)  Liens on assets of a Person at the time such Person becomes a
     Subsidiary; provided that (a) such Lien was not incurred in anticipation of
     or in connection with the transaction or series of related transactions
     pursuant to which such Person became a Subsidiary and (b) such Lien does
     not extend to or cover any assets of Parent or any other Restricted
     Subsidiary;



                                      -19-

          (3)  Liens existing on the Issue Date;

          (4)  Liens imposed by law that are incurred in the ordinary course of
     business and do not secure Indebtedness for borrowed money, such as
     carriers', warehousemen's, mechanics', landlords', materialmen's,
     employees', laborers', employers', suppliers', banks', repairmen's and
     other like Liens, in each case, for sums not yet due or that are being
     contested in good faith by appropriate proceedings and that are
     appropriately reserved for in accordance with GAAP if required by GAAP;

          (5)  Liens for taxes, assessments and governmental charges not yet due
     or payable or subject to penalties for non-payment or that are being
     contested in good faith by appropriate proceedings and that are
     appropriately reserved for in accordance with GAAP if required by GAAP;

          (6)  Liens on assets acquired or constructed after the Issue Date
     securing Purchase Money Indebtedness and Capital Lease Obligations;
     provided that such Liens shall in no event extend to or cover any assets
     other than the assets acquired or constructed after the Issue Date with the
     proceeds of such Purchase Money Indebtedness of Capital Lease Obligations;

          (7)  zoning restrictions, easements, rights-of-way, restrictions on
     the use of real property, other similar encumbrances on real property
     incurred in the ordinary course of business and minor irregularities of
     title to real property that do not (a) secure Indebtedness, or (b)
     individually or in the aggregate materially impair the value or
     marketability of the real property affected thereby or the occupation, use
     and enjoyment in the ordinary course of business of Parent and the
     Restricted Subsidiaries at such real property;

          (8)  terminable or short-term leases or permits for occupancy, which
     leases or permits (a) expressly grant to Parent or any Restricted
     Subsidiary the right to terminate them at any time on not more than six
     months' notice, (b) do not individually or in the aggregate interfere with
     the operation of the business of Parent or any Restricted Subsidiary or
     individually or in the aggregate impair the use (for its intended purpose)
     or the value of the property subject thereto and (c) are subordinated to
     the Liens granted and evidenced by the Security Documents in accordance
     with the provisions thereof;

          (9)  Liens resulting from operation of law with respect to any
     judgments, awards or orders to the extent that such judgments, awards or
     orders do not cause or constitute an Event of Default; provided that any
     such Liens shall be paid, discharged, bonded or stayed prior to the sale or
     forfeiture of any portion of the Collateral on account of such Liens;

          (10) bankers' Liens, rights of setoff and other similar Liens existing
     solely with respect to cash and cash equivalents on deposit in one or more
     accounts maintained by Parent or any Restricted Subsidiary in accordance
     with the provisions of this Indenture or applicable Security Documents, in
     each case granted in the ordinary course of business in favor of the bank
     or banks with which such accounts are maintained, securing amounts owing to
     such bank with respect to cash management and operating account
     arrangements; provided that in no case shall any such Liens secure (either
     directly or indirectly) the repayment of any Indebtedness;



                                      -20-

          (11) Liens securing Refinancing Indebtedness relating to Permitted
     Liens of the type described in clauses (2), (3) and (6) of this definition;
     provided that such Liens extend only to the assets securing the
     Indebtedness being Refinanced;

          (12) other Liens securing obligations (not constituting indebtedness
     for money borrowed) in an aggregate amount not to exceed $2.0 million at
     any time outstanding;

          (13) Liens securing the Credit Facility;

          (14) Liens securing Hedging Obligations of the type described in
     clause (7) of the definition of "Permitted Indebtedness";

          (15) Liens securing Indebtedness of Foreign Subsidiaries;

          (16) Liens in favor of Issuer or any Guarantor; provided that such
     Liens do not secure obligations that are assigned to any Person other than
     (i) the Bank Collateral Agent pursuant to the Credit Facility, (ii) the
     2008 Notes trustee to the extent that such assignment is required pursuant
     to the terms of the indenture governing the 2008 Notes as in effect on the
     Issue Date, and (iii) the trustee or collateral agent for any Refinancing
     Indebtedness incurred to Refinance the 2008 Notes; provided that the terms
     of such Refinancing Indebtedness requiring such assignment are
     substantially similar to those contained in the indenture governing the
     2008 Notes as in effect on the Issue Date;

          (17) Liens on assets or shares of stock of a Person at the time such
     Person becomes a Subsidiary; provided that such Lien was not incurred in
     anticipation of or in connection with the transaction or series of related
     transactions pursuant to which such Person became a Subsidiary;

          (18) pledges of or Liens on raw materials or on manufactured products
     as security for any drafts or bills of exchange drawn in connection with
     the importation of such raw materials or manufactured products;

          (19) Liens in favor of banks that arise under Article 4 of the UCC on
     items in collection and documents relating thereto and proceeds thereof and
     Liens arising under Section 2-711 of the UCC;

          (20) Liens arising or that may be deemed to arise in favor of a
     Securitization Entity arising in connection with a Qualified Securitization
     Transaction;

          (21) pledges or deposits by such Person under workers' compensation
     laws, unemployment insurance laws or similar legislation, or good faith
     deposits in connection with bids, tenders, contracts (other than for the
     payment of Indebtedness) or leases to which such Person is a party, or
     deposits to secure public or statutory obligations of such Person or
     deposits of cash or United States government bonds to secure surety or
     appeal bonds to which such Person is a party, or deposits as security for
     contested taxes or import duties or for the payment of rent or deposits as
     security for the payment of insurance-related obligations (including, but
     not



                                      -21-

     limited to, in respect of deductibles, self-insured retention amounts and
     premiums and adjustments thereto), in each case incurred in the ordinary
     course of business;

          (22) Liens in favor of issuers of surety, performance, judgment,
     appeal and like bonds or letters of credit issued in the ordinary course of
     business;

          (23) Liens occurring solely by the filing of a UCC statement, which
     filing has not been consented to by Parent or any Restricted Subsidiary;

          (24) any obligations or duties affecting any property of Parent or any
     Restricted Subsidiary to any municipality or public authority with respect
     to any franchise, grant, license or permit that do not materially impair
     the use of such property for the purposes for which it is held;

          (25) Liens on any property in favor of domestic or foreign
     governmental bodies to secure partial, progress, advance or other payments
     pursuant to any contract or statute, not yet due and payable;

          (26) Liens encumbering deposits made to secure obligations arising
     from statutory, regulatory, contractual or warranty requirements; and

          (27) deposits, pledges or other Liens to secure obligations under
     purchase or sale agreements.

          "Person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization,
government or any agency or political subdivision thereof or any other entity.

          "Pledgor" has the meaning assigned to such term in the applicable
Security Document.

          "Preferred Stock" as applied to the Capital Stock of any corporation,
means Capital Stock of any class or classes (however designated) which is
preferred as to the payment of dividends, or as to the distribution of assets
upon any voluntary or involuntary liquidation or dissolution of such
corporation, over shares of Capital Stock of any other class of such
corporation.

          "principal" of a Note means the principal of the Note plus the
premium, if any, payable on the Note which is due or overdue or is to become due
at the relevant time.

          "Private Placement Legend" means the legend initially set forth on the
Notes in the form set forth in Section 2.13.

          "Pro Forma Cost Savings" means, with respect to any period, the
reduction in costs that occurred during the period that were (1) directly
attributable to an acquisition and calculated on a basis that is consistent with
Article 11 of Regulation S-X under the Securities Act as in effect on the date
hereof or (2) implemented by the business that was the subject of any such
acquisition within one year of the date of the acquisition and that are
supportable and quantifiable by the underlying account-



                                      -22-

ing records of such business, as if, in the case of each of clauses (1) and (2),
all such reductions in costs had been effected as of the beginning of such
period, decreased by any incremental expenses (except to the extent capitalized
on Parent's consolidated balance sheet) incurred or to be incurred for the
period in order to achieve such reduction in costs.

          "Prudent Operator" has the meaning set forth in the applicable
Security Document.

          "Purchase Money Indebtedness" mean Indebtedness (i) consisting of the
deferred purchase price of assets, conditional sale obligations, obligations
under any title retention agreement, other purchase money obligations and
obligations in respect of industrial revenue bonds or similar Indebtedness, in
each case where the maturity of such Indebtedness does not exceed the
anticipated useful life of the asset being financed, and (ii) incurred to
finance the acquisition by Parent or a Restricted Subsidiary of such asset,
including additions and improvements; provided that any Lien arising in
connection with any such Indebtedness shall be limited to the specified asset
being financed or, in the case of real property or fixtures, including additions
and improvements, the real property on which such asset is attached; provided
further that such Indebtedness is incurred within 120 days after such
acquisition of, or the completion of construction of, such asset by Parent or
Restricted Subsidiary

          "Purchase Money Note" means a promissory note evidencing a line of
credit, which may be irrevocable, from, or evidencing other Indebtedness owed
to, Parent or any of its Subsidiaries in connection with a Qualified
Securitization Transaction, which note shall be repaid from cash available to
the maker of such note, other than amounts required to be established as
reserves pursuant to agreements, amounts paid to investors in respect of
interest, principal and other amounts owing to such investors and amounts paid
in connection with the purchase of newly generated receivables.

          "Qualified Institutional Buyer" or "QIB" shall have the meaning
specified in Rule 144A under the Securities Act.

          "Qualified Securitization Transaction" means any transaction or series
of transactions that may be entered into by Parent, any Restricted Subsidiary or
a Securitization Entity pursuant to which Parent or such Restricted Subsidiary
or that Securitization Entity may, pursuant to customary terms, sell, convey or
otherwise transfer to, or grant a security interest in for the benefit of, (i) a
Securitization Entity or Parent or any Restricted Subsidiary which subsequently
transfers to a Securitization Entity (in the case of a transfer by Parent or
such Restricted Subsidiary) and (ii) any other Person (in the case of transfer
by a Securitization Entity), any accounts receivable (whether now existing or
arising or acquired in the future) of Parent or any Restricted Subsidiary which
arose in the ordinary course of business of Parent or such Restricted
Subsidiary, and any assets related thereto, including, without limitation, all
collateral securing such accounts receivable, all contracts and contract rights
and all guarantees or other obligations in respect of such accounts receivable,
proceeds of such accounts receivable and other assets (including contract
rights) which are customarily transferred or in respect of which security
interests are customarily granted in connection with asset securitization
transactions involving accounts receivable.

          "Qualified Stock" means any Capital Stock of Parent other than
Disqualified Stock.



                                      -23-

          "Reference Treasury Dealer" means each of (i) Salomon Smith Barney
Inc. or any successor; provided that if the foregoing shall not be a primary U.S
Government securities dealer in New York City (a "Primary Treasury Dealer"),
Issuer shall substitute therefor another Primary Treasury Dealer and (ii) any
Primary Treasury Dealer selected by Issuer.

          "Reference Treasury Dealer Quotations" means, with respect to each
Reference Treasury Dealer on any date of redemption, the average, as determined
by the Trustee, of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) quoted in
writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m. on the
third business day preceding such date of redemption.

          "Refinance" means, in respect of any Indebtedness, to refinance,
extend, increase, replace, renew, refund, repay, prepay, redeem, defease or
retire, or to issue other Indebtedness in exchange or replacement for, such
Indebtedness. "Refinanced" and "Refinancing" shall have correlative meanings.

          "Refinancing Indebtedness" means, with respect to any Indebtedness,
Indebtedness incurred to Refinance such Indebtedness that does
not:

          (1)  result in an increase in the aggregate principal amount of
     Indebtedness being Refinanced as of the date of such proposed Refinancing
     (plus the amount of any premium required to be paid under the terms of the
     instrument governing such Indebtedness and plus the amount of reasonable
     expenses incurred in connection with such Refinancing) or

          (2)  create Indebtedness with (a) a Weighted Average Life to Maturity
     that is less than the Weighted Average Life to Maturity of the Indebtedness
     being Refinanced or (b) a final maturity earlier than the final maturity of
     the Indebtedness being Refinanced;

provided that (x) if the Indebtedness being Refinanced is subordinated by its
terms to the Notes or a Guarantee, then such Refinancing Indebtedness shall be
subordinated by its terms to the Notes or such Guarantee at least to the same
extent and in the same manner as the Indebtedness being Refinanced and (y) the
obligor(s) on the Refinancing Indebtedness shall not include any Person that is
not Issuer or a Guarantor or a Person that is an obligor on the Indebtedness
being Refinanced.

          "Registration Rights Agreement" means the Registration Rights
Agreement dated the Issue Date among Terra Capital, the Guarantors party thereto
and the Initial Purchasers.

          "Regulation S" means Regulation S under the Securities Act.

          "Regulation S-X" means Regulation S-X under the Securities Act.

          "Released Interests" has the meaning set forth in Section 12.4.

          "Responsible Officer" means, when used with respect to the Trustee,
any officer assigned to the Corporate Trust Office, including any vice
president, assistant vice president, assistant



                                      -24-

secretary or any other officer of the Trustee to whom any corporate trust matter
is referred because of his or her knowledge or familiarity with the particular
subject.

          "Restricted Payment" means, with respect to any Person:

          (i)   any dividend or other distribution declared or paid on any
     Capital Stock of Parent (other than dividends or distributions payable
     solely in Qualified Stock);

          (ii)  any payment to purchase, redeem or otherwise acquire or retire
     for value any Capital Stock of Parent or any affiliate of Parent (other
     than any Restricted Subsidiary);

          (iii) any payment to purchase, redeem, defease or otherwise acquire or
     retire for value any Subordinated Obligations prior to the Stated Maturity
     thereof (other than any Purchase Money Indebtedness incurred after the
     Issue Date upon the sale of the related asset); or

          (iv)  the making of an Investment (other than a Permitted Investment),
     including any Investment in an Unrestricted Subsidiary (including by the
     designation of any Subsidiary of Parent as an Unrestricted Subsidiary).

          "Restricted Security" has the meaning assigned to "Restricted
Security" in Rule 144(a)(3) under the Securities Act; provided, however, that
the Trustee shall be entitled to request and conclusively rely on an Opinion of
Counsel with respect to whether any Note constitutes a Restricted Security.

          "Restricted Subsidiary" means Issuer and each other Subsidiary of
Parent that is not an Unrestricted Subsidiary.

          "Rule 144A" means Rule 144A under the Securities Act.

          "Sale and Leaseback Transaction" means an arrangement relating to
property now owned or hereafter acquired whereby Parent or a Restricted
Subsidiary transfers such property to a Person and Parent or a Restricted
Subsidiary leases it from such Person.

          "Securities Act" shall mean the Securities Act of 1933, as amended.

          "Securitization Entity" means a Wholly Owned Subsidiary of Parent (or
another Person in which Parent or any Subsidiary of Parent makes an Investment
and to which Parent or any Subsidiary of Parent transfers accounts receivable):

          (1)   which is designated by the Board of Directors (as provided
     below) as a Securitization Entity and engages in no activities other than
     in connection with the financing of accounts receivable;

          (2)   no portion of the Indebtedness or any other obligations
     (contingent or otherwise) of which (a) is guaranteed by Parent or any of
     its Subsidiaries (other than the Securitization Entity) (excluding
     guarantees of obligations (other than the principal of, and interest on,
     Indebtedness)) pursuant to Standard Securitization Undertakings), (b) has
     recourse to or obli-



                                      -25-

     gates Parent or any of its Subsidiaries (other than the Securitization
     Entity) in any way other than pursuant to Standard Securitization
     Undertakings or (c) subjects any asset of Parent or any of its Subsidiaries
     (other than the Securitization Entity), directly or indirectly,
     contingently or otherwise, to the satisfaction thereof, other than pursuant
     to Standard Securitization Undertakings and other than any interest in the
     accounts receivable (whether in the form of an equity interest in such
     assets or subordinated indebtedness payable primarily from such financed
     assets) retained or acquired by Parent or any of its Subsidiaries;

          (3) with which neither Parent nor any of its Subsidiaries has any
     material contract, agreement, arrangement or understanding other than on
     terms no less favorable to Parent or such Subsidiary than those that might
     be obtained at the time from Persons that are not affiliates of Parent,
     other than fees payable in the ordinary course of business in connection
     with servicing receivables of such entity; and

          (4) to which neither Parent nor any of its Subsidiaries has any
     obligation to maintain or preserve such entity's financial condition or
     cause such entity to achieve certain levels of operating results.

          Any such designation by the Board of Directors shall be evidenced to
the Trustee by filing with the Trustee a certified copy of the resolution giving
effect to such designation and an Officers' Certificate certifying that such
designation complied with the foregoing conditions.

          "Security Documents" means, collectively, (1) the Security Agreement
among Parent, Issuer, the Guarantors and the Trustee, as collateral agent, and
(2) all security agreements, mortgages, deeds of trust, pledges, collateral
assignments, charges, debentures and other agreements or instruments evidencing
or creating any security interest or Lien in favor of the Trustee whether
directly or by assignment on behalf of itself and the Holders in any or all of
the Collateral, in each case as amended from time to time in accordance with
their terms.

          "Security Interests" means the Liens on the Collateral created by the
Security Documents in favor of the Trustee, for its benefit and for the benefit
of the Holders.

          "Significant Subsidiary" means (i) any Restricted Subsidiary that is a
"significant subsidiary" of Parent on a consolidated basis within the meaning of
Regulation S-X promulgated by the SEC or (ii) any Restricted Subsidiary that,
when aggregated with all other Restricted Subsidiaries that are not otherwise
Significant Subsidiaries and as to which any event described in Section
6.1(vii), (viii), or (ix) has occurred and is continuing, would constitute a
Significant Subsidiary under clause (i) of this definition.

          "Special Adjusted Treasury Rate" means, with respect to any date of
redemption or purchase, the rate per annum equal to the semiannual equivalent
yield to maturity of the Comparable Treasury Issue, assuming a price equal to
the Comparable Treasury Issue (expressed as a percentage of its principal
amount) equal to the Comparable Treasury Price for such date of redemption or
purchase, plus 0.50%.



                                      -26-

          "Standard Securitization Undertakings" means representations,
warranties, covenants and indemnities entered into by Parent or any of its
Subsidiaries which are reasonably customary in an accounts receivable
securitization transaction.

          "Stated Maturity" means, with respect to any security, the date
specified in such security as the fixed date on which the final payment of
principal of such security is due and payable, including pursuant to any
mandatory redemption provision (but excluding any provision providing for the
repurchase of such security at the option of the holder thereof upon the
happening of any contingency unless such contingency has occurred).

          "Subordinated Obligation" means any Indebtedness of Parent, Issuer or
a Guarantor (whether outstanding on the Issue Date or thereafter incurred) which
is subordinated by its terms in right of payment to the Notes or the Guarantee
of Parent or such Guarantor.

          "Subsidiary" means, in respect of any Person, any corporation,
association, partnership or other business entity of which Voting Stock
representing more than 50% of the total voting power of all outstanding Voting
Stock of such Person is at the time owned, directly or indirectly, by (i) such
Person, (ii) such Person and one or more Subsidiaries of such Person or (iii)
one or more Subsidiaries of such Person.

          "Taxes" means any tax, duty, levy, impost, assessment or other
governmental charge (including penalties, interest, expenses and any other
liabilities related thereto) levied, imposed or assessed by or on behalf of any
taxing authority.

          "Temporary Cash Investments" means any of the following:

          (i)   any investment in direct obligations of the United States of
     America or any agency thereof or obligations guaranteed by the United
     States of America or any agency thereof;

          (ii)  investments in time or demand deposit accounts, certificates of
     deposit and money market deposits maturing within 180 days of the date of
     acquisition thereof issued by a bank or trust company which is organized
     under the laws of the United States of America, any State thereof or any
     foreign country recognized by the United States, and which bank or trust
     company has capital, surplus and undivided profits aggregating in excess of
     $50,000,000 (or the foreign currency equivalent thereof) and has
     outstanding debt which is rated "A-2" or higher by Moody's Investors
     Service, Inc. ("Moody's"), "A" or higher by Standard & Poor's Ratings Group
     ("S&P") or the equivalent rating by any other nationally recognized
     statistical rating organization (as defined in Rule 436 under the
     Securities Act) or any money-market fund sponsored by a registered broker
     dealer or mutual fund distributor;

          (iii) repurchase obligations with a term of not more than 30 days for
     underlying securities of the types described in clause (i) above entered
     into with a bank meeting the qualifications described in clause (ii) above;



                                      -27-

          (iv) investments in commercial paper, maturing not more than 90 days
     after the date of acquisition, issued by a corporation (other than an
     affiliate of Issuer) organized and in existence under the laws of the
     United States of America, any State thereof or the District of Columbia or
     any foreign country recognized by the United States of America with a
     rating at the time as of which any investment therein is "P-2" or higher
     from Moody's, "A-2" or higher from S&P or the equivalent rating by any
     other nationally recognized statistical rating organization (as defined
     above);

          (v) investments in securities with maturities of six months or less
     from the date of acquisition issued or fully guaranteed by any state,
     commonwealth or territory of the United States of America, or by any
     political subdivision or taxing authority thereof, and rated at least "A"
     by Moody's or "A" by S & P; and

          (vi) shares of any money market mutual fund rated at least AAA or the
     equivalent thereof by S&P, at least Aaa or the equivalent thereof by
     Moody's or any other mutual fund at least 95% of whose assets consist of
     the type specified in clauses (i) through (v) above.

          "Terra Canada" means Terra International (Canada) Inc., an Ontario
corporation.

          "Terra UK" means Terra Nitrogen (U.K.) Ltd., an English company.

          "Terra UK Customer Debt" means Indebtedness for borrowed money of a
customer of Terra UK owing to a financial institution in the United Kingdom;
provided that:

          (i)   such customer uses the entire principal proceeds of such
     Indebtedness to pay for goods and services purchased from Terra UK;

          (ii)  such customer is required to repay such Indebtedness in full
     within 12 months of the date on which such Indebtedness is incurred;

          (iii) in the reasonable opinion of Terra UK, such customer is
     creditworthy; and

          (iv)  it is a condition of the extension of credit by such financial
     institution to such customer that Terra UK guarantee a portion of such
     Indebtedness.

          "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. ss.ss.
77aaa-77bbbb) as in effect on the date of this Indenture, except as provided in
Section 9.3.

          "TNCLP" means Terra Nitrogen Company, L.P., a Delaware limited
partnership.

          "TNLP" means Terra Nitrogen, Limited Partnership, a Delaware limited
partnership.

          "Transfer" means to sell, assign, transfer, lease (other than pursuant
to an operating lease entered into in the ordinary course of business), convey
or otherwise dispose of, including by Sale and Leaseback Transaction,
consolidation, merger or otherwise, in one transaction or a series of
transactions. "Transferred," "Transferor" and "Transferee" have correlative
meanings.



                                      -28-

          "Trustee" means the party named as such in this Indenture until a
successor replaces it and, thereafter, means the successor.

          "Trust Monies" means all cash and Temporary Cash Investments received
by the Trustee as proceeds from a Casualty Event to the extent it relates to all
or any part of the Collateral pursuant to Section 12.12.

          "Trust Officer" means the Chairman of the Board, the President or any
other officer or assistant officer of the Trustee assigned by the Trustee to
administer its corporate trust matters.

          "2008 Notes" means Issuer's 12 7/8% Senior Secured Notes due 2008.

          "2008 Notes Collateral" means the collateral from time to time
securing Obligations with respect to the 2008 Notes; provided that the
Collateral or any other collateral from time to time securing the Notes shall
not be 2008 Notes Collateral for the purposes of this Indenture.

          "UCC " means the Uniform Commercial Code in effect in the applicable
jurisdiction.

          "Unrestricted Subsidiary" means (i) any Subsidiary of Parent that at
the time of determination shall have been designated an Unrestricted Subsidiary
by the Board of Directors; and (ii) any Subsidiary of an Unrestricted
Subsidiary. The Board of Directors may designate any Subsidiary of Parent
(including any newly acquired or newly formed Subsidiary) to be an Unrestricted
Subsidiary unless such Subsidiary or any of its Subsidiaries owns any Capital
Stock or Indebtedness of, or holds any Lien on any assets of, Issuer or any
other Subsidiary of Parent that is not a Subsidiary of the Subsidiary to be so
designated; provided that (i) no Default has occurred and is continuing or would
occur as a consequence thereof, (ii) Issuer could incur at least $1.00 of
additional Indebtedness under Section 4.9(a) and (iii) either (x) the Subsidiary
to be so designated has total assets of $1,000 or less or (y) if such Subsidiary
has assets greater than $1,000, such designation would be permitted under
Section 4.10 (treating the Fair Market Value of Issuer's proportionate interest
in the net worth of such Subsidiary on such date calculated in accordance with
GAAP as the amount of the Investment). The Board of Directors may redesignate
any Unrestricted Subsidiary to be a Restricted Subsidiary; provided that (i) no
Default shall have occurred and is continuing and (ii) Indebtedness of such
Unrestricted Subsidiary and all Liens on any asset of such Unrestricted
Subsidiary outstanding immediately following such redesignation would, if
incurred at such time, be permitted to be incurred under this Indenture.

          "U.S. Government Obligations" means direct obligations (or
certificates representing an ownership interest in such obligations) of the
United States of America (including any agency or instrumentality thereof) for
the payment of which the full faith and credit of the United States of America
is pledged and which are not callable at the issuer's option.

          "U.S. Legal Tender" means such coin or currency of the United States
of America as at the time of payment shall be legal tender for the payment of
public or private debts.



                                      -29-

          "Voting Stock" of a Person means all classes of Capital Stock
or other interests (including partnership interests) of such Person then
outstanding and normally entitled (without regard to the occurrence of any
contingency) to vote in the election of directors, managers or trustees thereof.

          "Weighted Average Life to Maturity" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing:

          (1)  the then outstanding aggregate principal amount of such
     Indebtedness into

          (2)  the sum of the total of the products obtained by multiplying (x)
     the amount of each then remaining installment, sinking fund, serial
     maturity or other required payment of principal, including payment at final
     maturity, in respect thereof, by (y) the number of years (calculated to the
     nearest one-twelfth) that will elapse between such date and the making of
     such payment.

          "Wholly Owned Subsidiary" means a Restricted Subsidiary all the
Capital Stock of which (other than directors' qualifying shares) is owned by
Parent and/or one or more Wholly Owned Subsidiaries.

          SECTION 1.2.  Other Definitions./1/

                    Term                               Defined in Section
                    ----                               ------------------

"Affiliate Transaction"                                      4.12
"Bankruptcy Law"                                             6.1
"covenant defeasance option"                                 8.1(b)
"Custodian"                                                  6.1
"defeasance trust"                                           8.2
"Event of Default"                                           6.1
"Excess Proceeds"                                            4.13(f)
"Global Notes"                                               2.1(b)
"Guaranteed Obligations"                                    10.1
"legal defeasance option"                                    8.1(b)
"maximum fixed repurchase price"                             1.1
"Moody's"                                                    1.1
"Net Proceeds Deficiency"                                    4.13(f)
"Net Proceeds Offer"                                         4.13(f)
"Net Proceeds Offer Amount"                                  4.13(i)
"Net Proceeds Offer Period"                                  4.13(i)

_________

/1/  Update section.



                                      -30-

                    Term                               Defined in Section
                    ----                               ------------------

"Notes Register"                                             2.3
"Participants"                                               2.6
"Paying Agent"                                               2.3
"Payment Default                                             6.1
"Physical Notes"                                             2.1(b)
"Private Placement Legend"                                   2.13
"Purchase Date"                                              4.13(h)
"Registrar"                                                  2.3
"Related Investment"                                         4.13(e)
"Release Notice"                                            12.4
"Required Filing Dates"                                      4.6
"S&P"                                                        1.1
"Unused Proceeds"                                            4.14(c)
"Unused Proceeds Offer"                                      4.15(d)
"Unused Proceeds Offer Amount"                               4.15(d)
"Unused Proceeds Offer Period"                               4.15(d)

          SECTION 1.3. Incorporation by Reference of Trust Indenture Act. This
Indenture is subject to the mandatory provisions of the TIA, which are
incorporated by reference in and made a part of this Indenture. The following
TIA terms have the following meanings:

          "Commission" means the SEC.

          "indenture securities" means the Notes.

          "indenture security holder" means a Noteholder.

          "indenture to be qualified" means this Indenture.

          "indenture trustee" or "institutional trustee" means the Trustee.

          "obligor" on the indenture securities means Terra Capital, the
     Guarantors or any other obligor on the indenture securities.

          All other TIA terms used in this Indenture that are defined by the
TIA, defined by TIA reference to another statute or defined by SEC rule have the
meanings assigned to them by such definitions.

          SECTION 1.4. Rules of Construction. (a) Unless the context otherwise
requires:

          (1)  a term has the meaning assigned to it;

          (2)  an accounting term not otherwise defined has the meaning assigned
     to it in accordance with GAAP;



                                      -31-

          (3)  "or" is not exclusive;

          (4)  "including" means including without limitation;

          (5)  words in the singular include the plural and words in the plural
     include the singular;

          (6)  the principal amount of any non-interest-bearing or other
     discount security at any date shall be the principal amount thereof that
     would be shown on a balance sheet of Parent dated such date prepared in
     accordance with GAAP;

          (7)  all references to $, US$, dollars or United States dollars shall
     refer to the lawful currency of the United States; and

          (8)  "herein," "hereof" and other words of similar import refer to
     this Indenture as a whole and not to any particular Article, Section or
     other subdivision.

                                    ARTICLE 2

                                    THE NOTES

          SECTION 2.1. Form and Dating.

          (a)  The Initial Notes and the Trustee's certificate of authentication
relating thereto shall be substantially in the form of Exhibit A hereto. The
Exchange Notes and the Trustee's certificate of authentication relating thereto
shall be substantially in the form of Exhibit B hereto. The Notes may have
notations, legends or endorsements required by law, stock exchange rules,
agreements to which Parent or Terra Capital is subject, if any, or usage
(provided that any such notation, legend or endorsement is in a form acceptable
to Parent or Terra Capital, as the case may be). Each Note shall be dated the
date of its authentication. If required, the Notes may bear the appropriate
legend regarding any original issue discount for federal income tax purposes.
Each Note shall have an executed Guarantee from each of the Guarantors.

          The terms and provisions contained in the Notes, annexed hereto as
Exhibits A and B, shall constitute, and are hereby expressly made, a part of
this Indenture and, to the extent applicable, Terra Capital, the Guarantors and
the Trustee, by their execution and delivery of this Indenture, expressly agree
to such terms and provisions and to be bound thereby.

          (b)  Global Notes. The Notes offered and sold in reliance on Rule 144A
and Notes offered and sold in reliance on Regulation S shall be issued initially
in the form of one or more permanent Global Notes ("Global Notes") in
definitive, fully registered form without interest coupons, in substantially the
form of Exhibit A, which shall be deposited on behalf of the purchasers of the
Notes represented thereby with the Trustee, at the Trustee's office in New York
City, as custodian for the Depository, and registered in the name of the
Depository or a nominee of the Depository, duly executed by Terra Capital (and
having an executed Guarantee endorsed thereon) and authenticated by the Trustee
as hereinafter provided and shall bear the legend set forth in Section 2.13. The
aggregate



                                      -32-

principal amount of the Global Notes may from time to time be increased or
decreased by adjustments made on the records of the Trustee and the Depository
or its nominee in the limited circumstances hereinafter provided.

          Securities issued in exchange for interests in Global Notes pursuant
to Section 2.6 may be issued in the form of permanent certificated Securities in
registered form in substantially the form set forth in Exhibit A (the "Physical
Notes").

          SECTION 2.2. Execution and Authentication. An Officer of Terra Capital
and each Guarantor shall sign the Notes and the Guarantees, respectively, by
manual or facsimile signature. If an Officer whose signature is on a Note no
longer holds that office at the time the Trustee authenticates the Note, the
Note shall be valid nevertheless. A Note shall not be valid until an authorized
signatory of the Trustee manually signs the certificate of authentication on the
Note. The signature shall be conclusive evidence that the Note has been
authenticated under this Indenture. The Trustee shall authenticate and make
available for delivery (i) Initial Notes for original issue in an aggregate
principal amount of $202,000,000, (ii) Exchange Notes from time to time for
issue only in exchange for a like principal amount of Initial Notes, in each
case, upon a written order of Terra Capital signed by an Officer of Terra
Capital and (iii) subject to Section 4.9, Additional Notes. Such order shall
specify the amount of the Notes to be authenticated and the date on which the
Notes are to be authenticated. The aggregate principal amount of Notes
outstanding at any time may not exceed $202,000,000 except as provided in
Section 2.7. The Trustee may appoint an authenticating agent acceptable to Terra
Capital to authenticate the Notes, upon the consent of Terra Capital to such
appointment. Unless limited by the terms of such appointment, an authenticating
agent may authenticate Notes whenever the Trustee may do so. Each reference in
this Indenture to authentication by the Trustee includes authentication by such
agent. An authenticating agent has the same rights as any Registrar, Paying
Agent or agent for service of notices and demands.

          SECTION 2.3. Registrar and Paying Agent. Terra Capital shall maintain
an office or agency where Notes may be presented for registration of transfer or
for exchange (the "Registrar") and an office or agency where Securities may be
presented for payment (the "Paying Agent"). The Registrar, acting on behalf of
and as agent for Terra Capital, shall keep a register (the "Notes Register") of
the Notes and of their transfer and exchange. Terra Capital may have one or more
co-registrars and one or more additional paying agents.

          The term "Paying Agent" includes any additional paying agent. Terra
Capital shall enter into an appropriate agency agreement with any Registrar,
Paying Agent or co-registrar not a party to this Indenture, which shall
incorporate the terms of the TIA. The agreement shall implement the provisions
of this Indenture that relate to such agent. Terra Capital shall notify the
Trustee of the name and address of any such agent. If Terra Capital fails to
maintain a Registrar or Paying Agent, the Trustee shall act as such and shall be
entitled to appropriate compensation therefor pursuant to Section 7.7. Terra
Capital or a Subsidiary thereof may act as Paying Agent, Registrar, co-Registrar
or transfer agent.

          Terra Capital initially appoints the Trustee as Registrar and Paying
Agent in connection with the Notes, until such time as the Trustee has resigned
or a successor has been appointed.



                                      -33-

Any of the Registrar, the Paying Agent or any other agent may resign upon 30
days' notice to Terra Capital.

          SECTION 2.4. Paying Agent To Hold Money in Trust. On or prior to each
due date of the principal and interest on any Note, Terra Capital shall deposit
with the Paying Agent a sum sufficient to pay such principal and interest when
so becoming due. Terra Capital shall require each Paying Agent (other than the
Trustee) to agree in writing that the Paying Agent shall hold in trust for the
benefit of Holders or the Trustee all money held by the Paying Agent for the
payment of principal of or interest on the Notes and shall notify the Trustee of
any default by Terra Capital in making any such payment. If Terra Capital or a
Subsidiary acts as Paying Agent, it shall segregate the money held by it as
Paying Agent and hold it as a separate trust fund. Terra Capital at any time may
require a Paying Agent to pay all money held by it to the Trustee and to account
for any funds disbursed by the Paying Agent. Upon complying with this Section,
the Paying Agent shall have no further liability for the money delivered to the
Trustee.

          SECTION 2.5. Holder Lists. The Trustee shall preserve in as current a
form as is reasonably practicable the most recent list available to it of the
names and addresses of Holders. If the Trustee is not the Registrar, Terra
Capital shall furnish to the Trustee, in writing at least five Business Days
before each interest payment date and at such other times as the Trustee may
request in writing, a list in such form and as of such date as the Trustee may
reasonably require of the names and addresses of Holders; provided, however,
that as long as the Trustee is the Registrar, no such list need be furnished.

          SECTION 2.6. Transfer and Exchange. The Notes shall be issued in
registered form and shall be transferable only upon the surrender of a Note for
registration of transfer. When a Note is presented to the Registrar or a
co-registrar with a request to register a transfer, the Registrar and the
Trustee may require a Holder, among other things, to furnish appropriate
endorsements and transfer documents and the Registrar shall record in the Notes
Register the transfer as requested if the requirements of Section 8-401(1) of
the UCC are met, and thereupon one or more new Notes in the same aggregate
principal amount shall be issued to the designated assignee or transferee and
the old Note will be returned to Terra Capital. When Notes are presented to the
Registrar or a co-registrar with a request to exchange them for an equal
principal amount of Notes of other denominations, the Registrar shall make the
exchange as requested, in the same manner, if the same requirements are met. To
permit registration of transfers and exchanges, Terra Capital shall execute and
the Trustee shall authenticate Notes and each of the Guarantors shall execute a
Guarantee thereon at the Registrar's or co-registrar's request. Terra Capital
may require payment of a sum sufficient to pay all taxes, assessments or other
governmental charges in connection with any transfer or exchange pursuant to
this Section. Terra Capital shall not be required to make and the Registrar need
not register transfers or exchanges of Notes selected for redemption (except, in
the case of Notes to be redeemed in part, the portion thereof not to be
redeemed) or any Notes for a period of 15 days before a selection of Notes to be
redeemed or 15 days before an interest payment date.

          Prior to the due presentation for registration of transfer of any
Note, Terra Capital, the Trustee, the Paying Agent, the Registrar or any
co-registrar may deem and treat the person in whose name a Note is registered as
the absolute owner of such Note for the purpose of receiving payment of
principal of and interest on such Note and for all other purposes whatsoever,
whether or not such Note



                                      -34-

is overdue, and none of Terra Capital, the Trustee, the Paying Agent, the
Registrar or any co-registrar shall be affected by notice to the contrary.

          All Notes issued upon any transfer or exchange pursuant to the terms
of this Indenture will evidence the same debt and will be entitled to the same
benefits under this Indenture as the Notes surrendered upon such transfer or
exchange.

          With respect to Global Notes:

          (1) Each Global Note authenticated under this Indenture shall (i) be
     registered in the name of the Depository designated for such Global Note or
     a nominee thereof, (ii) be deposited with such Depository or a nominee
     thereof or custodian therefor, (iii) bear legends as set forth in Section
     2.13 and (iv) constitute a single Note for all purposes of this Indenture.

          (2) Transfers of a Global Note shall be limited to transfers in whole
     but not in part to the Depository, its successors or their respective
     nominees. Interests of beneficial owners in a Global Note may be
     transferred or exchanged for Physical Notes in accordance with the rules
     and procedures of the Depository and the provisions of Section 2.14. In
     addition, a Global Note is exchangeable for certificated Notes if (i) the
     Depository notifies Terra Capital that it is unwilling or unable to
     continue as a Depository for such Global Note or if at any time the
     Depository ceases to be a clearing agency registered under the Exchange
     Act, (ii) Terra Capital executes and delivers to the Trustee a notice that
     such Global Note shall be so transferable, registrable, and exchangeable,
     and such transfers shall be registrable or (iii) there shall have occurred
     and be continuing a Default. Any Global Note that is exchangeable for
     certificated Notes pursuant to the preceding sentence will be transferred
     to, and registered and exchanged for, certificated Notes in authorized
     denominations, without legends applicable to a Global Note, and registered
     in such names as the Depository holding such Global Note may direct.
     Subject to the foregoing, a Global Note is not exchangeable, except for a
     Global Note of like denomination to be registered in the name of the
     Depository or its nominee. In the event that a Global Note becomes
     exchangeable for certificated Notes, (i) certificated Notes will be issued
     only in fully registered form in denominations of $1,000 or integral
     multiples thereof, (ii) payment of principal, any repurchase price, and
     interest on the certificated Notes will be payable, and the transfer of the
     certificated Notes will be registrable, at the office or agency of Terra
     Capital maintained for such purposes, and (iii) no service charge will be
     made for any registration or transfer or exchange of the certificated
     Notes, although Terra Capital may require payment of a sum sufficient to
     cover any tax or governmental charge imposed in connection therewith.

          (3) Notes issued in exchange for a Global Note or any portion thereof
     shall have an aggregate principal amount equal to that of such Global Note
     or portion thereof to be so exchanged, shall be registered in such names
     and be in such authorized denominations as the Depository shall designate
     and shall bear the applicable legends provided for herein. Any Global Note
     to be exchanged in whole shall be surrendered by the Depository to the
     Trustee. With respect to any Global Note to be exchanged in part, either
     such Global Note shall be so surrendered for exchange or, if the Trustee is
     acting as custodian for the Depository or its nominee with respect to such
     Global Note, the principal amount thereof shall be reduced, by



                                      -35-

     an amount equal to the portion thereof to be so exchanged, by means of an
     appropriate adjustment made on the records of the Trustee. Upon any such
     surrender or adjustment, the Trustee shall authenticate and deliver the
     Note issuable on such exchange to or upon the order of the Depository or an
     authorized representative thereof.

          (4) Every Note authenticated and delivered upon registration of
     transfer of, or in exchange for or in lieu of, a Global Note or any portion
     thereof, whether pursuant to this Section 2.6, Section 2.7, 2.9, 2.14 or
     otherwise, shall be authenticated and delivered in the form of, and shall
     be, a Global Note, unless such Note is registered in the name of a Person
     other than the Depository for such Global Note or a nominee thereof.
     Members of, or participants in, the Depository ("Participants") shall have
     no rights under this Indenture with respect to any Global Note held on
     their behalf by the Depository or by the Trustee as the custodian of the
     Depository or under such Global Note, and the Depository may be treated by
     Terra Capital, the Trustee and any agent of Terra Capital or the Trustee as
     the absolute owner of such Global Note for all purposes whatsoever.
     Notwithstanding the foregoing, nothing herein shall prevent Terra Capital,
     the Trustee or any agent of Terra Capital or the Trustee from giving effect
     to any written certification, proxy or other authorization furnished by the
     Depository or impair, as between the Depository and its Participants, the
     operation of customary practices of such Depository governing the exercise
     of the rights of a holder of a beneficial interest in any Global Note.

          SECTION 2.7. Replacement Notes. If a mutilated Note is surrendered to
the Trustee or Registrar or if the Holder of a Note claims that the Note has
been lost, destroyed or wrongfully taken, Terra Capital shall issue and the
Trustee shall authenticate a replacement Note and the Guarantors shall execute a
Guarantee thereon if the requirements of Section 8-405 of the UCC are met and
the Holder satisfies any other reasonable requirements of the Trustee and Terra
Capital. Such Holder shall furnish an indemnity bond sufficient in the judgment
of Terra Capital, the Guarantors and the Trustee to protect Terra Capital, the
Guarantors, the Trustee, the Paying Agent, the Registrar and any co-registrar
from any loss which any of them may suffer if a Note is replaced. Terra Capital
and the Trustee may charge the Holder for their expenses in replacing a Note.

          Every replacement Note issued pursuant to the terms of this Section
shall constitute an additional obligation of Terra Capital and the Guarantors
under this Indenture.

          The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the replacement
or payment of mutilated, destroyed, lost or stolen Notes.

          SECTION 2.8. Outstanding Notes. Notes outstanding at any time are all
Notes authenticated by the Trustee except for those canceled by it, those
delivered to it for cancellation and those described in this Section as not
outstanding. Subject to the provisions of Section 11.6, a Note does not cease to
be outstanding because Terra Capital or an Affiliate of Terra Capital holds the
Note.

          If a Note is replaced pursuant to Section 2.7, it ceases to be
outstanding unless the Trustee and Terra Capital receive proof satisfactory to
them that the replaced Note is held by a bona fide purchaser.



                                      -36-

          If the Paying Agent segregates and holds in trust, in accordance with
this Indenture, on a redemption date or maturity date or, pursuant to Section
8.1(a), within 91 days prior thereto, money sufficient to pay all principal and
interest payable on that redemption or maturity date with respect to the Notes
(or portions thereof) to be redeemed or maturing, as the case may be, then on
and after such date such Notes (or portions thereof) cease to be outstanding and
on and after such redemption or maturity date interest on them ceases to accrue.

          SECTION 2.9.  Temporary Notes. Until definitive Notes are ready for
delivery, Terra Capital may prepare and the Trustee shall authenticate temporary
Notes. Temporary Notes shall be substantially in the form of definitive Notes
but may have variations that Terra Capital considers appropriate for temporary
Notes. Without unreasonable delay, Terra Capital shall prepare and the Trustee
shall authenticate definitive Notes and deliver them in exchange for temporary
Notes.

          SECTION 2.10. Cancellation. Terra Capital at any time may deliver
Notes to the Trustee for cancellation. The Registrar and the Paying Agent shall
forward to the Trustee any Notes surrendered to them for registration of
transfer, exchange or payment. The Trustee and no one else shall cancel all
Notes surrendered for registration of transfer, exchange, payment or
cancellation and deliver such canceled Securities to Terra Capital. The Trustee
shall from time to time provide Terra Capital a list of all Securities that have
been canceled as requested by Terra Capital. Terra Capital may not issue new
Securities to replace Securities it has redeemed, paid or delivered to the
Trustee for cancellation.

          SECTION 2.11. Defaulted Interest. If Terra Capital defaults in a
payment of interest on the Notes, Terra Capital shall pay defaulted interest
(plus interest on such defaulted interest to the extent lawful) in any lawful
manner in accordance with Section 4.1. Terra Capital may pay the defaulted
interest to the Persons who are Holders on a subsequent special record date.
Terra Capital shall fix or cause to be fixed any such special record date and
payment date to the reasonable satisfaction of the Trustee and shall promptly
mail to each Holder a notice that states the special record date, the payment
date and the amount of defaulted interest to be paid.

          SECTION 2.12. CUSIP Numbers. Terra Capital in issuing the Notes may
use "CUSIP" numbers (if then generally in use), and, if so, the Trustee shall
use "CUSIP" numbers in notices of redemption as a convenience to Holders;
provided that any such notice may state that no representation is made as to the
correctness of such numbers either as printed on the Notes or as contained in
any notice of a redemption and that reliance may be placed only on the other
identification numbers printed on the Notes, and any such redemption shall not
be affected by any defect in or omission of such numbers. Terra Capital will
promptly notify the Trustee of any change in the CUSIP numbers.

          SECTION 2.13. Restrictive Legends. Each Global Note and Physical Note
that constitutes a Restricted Security or is sold in compliance with Regulation
S shall bear the following legend (the "Private Placement Legend") on the face
thereof until after the second anniversary of the later of the Issue Date and
the last date on which Terra Capital or any Affiliate of Terra Capital was the
owner of such Note (or any predecessor note) (or such shorter period of time as
permitted by Rule 144(k) under the Securities Act or any successor provision
thereunder), or such longer period of time as may be required under the
Securities Act or applicable state securities laws in the opinion of counsel for
Terra Capital, unless otherwise agreed by Terra Capital and the Holder thereof:



                                      -37-

          "This security (or its predecessor) has not been registered under the
     U.S. Securities Act of 1933, as amended (the "Securities Act"), and,
     accordingly, may not be offered, sold, pledged or otherwise transferred
     within the United States or to, or for the account or benefit of, U.S.
     persons, except as set forth in the next sentence. By its acquisition
     hereof or of a beneficial interest herein, the Holder:

          (1) Represents that (a) it is a "qualified institutional buyer" (as
     defined in rule 144A under the Securities Act) (a "QIB"), (b) it is
     acquiring this security in an offshore transaction in compliance with
     Regulation S under the Securities Act, or (c) it is an institutional
     "accredited investor" (as defined in Rule 501(a)(1), (2), (3) or (7) of
     Regulation D under the Securities Act) (an "IAI");

          (2) Agrees that it will not resell or otherwise transfer this security
     except (a) to the company or any of its subsidiaries, (b) to a person whom
     the seller reasonably believes is a QIB purchasing for its own account or
     for the account of a QIB in a transaction meeting the requirements of Rule
     144A, (c) in an offshore transaction meeting the requirements of Rule 903
     or 904 of Regulation S under the Securities Act, (d) in a transaction
     meeting the requirements of Rule 144 under the Securities Act, (e) to an
     IAI that, prior to such transfer, furnishes the Trustee a signed letter
     containing certain representations and agreements relating to the transfer
     of this security (the form of which can be obtained from the Trustee) and,
     if such transfer is in respect of an aggregate principal amount of
     securities less than $250,000, an opinion of counsel acceptable to the
     company, if the company so requests, that such transfer is in compliance
     with the Securities Act, (f) in accordance with another exemption from the
     registration requirements of the Securities Act (and based upon an opinion
     of counsel acceptable to the company), or (g) pursuant to an effective
     registration statement under the Securities Act and, in each case, in
     accordance with the applicable securities laws of any state of the United
     States or any other applicable jurisdiction; and

          (3) agrees that it will deliver to each person to whom this security
     or an interest herein is transferred a notice substantially to the effect
     of this legend.

     As used herein, the terms "offshore transaction" and "United States" have
     the meanings given to them by Rule 902 of Regulation S under the Securities
     Act. The indenture governing this security contains a provision requiring
     the trustee to refuse to register any transfer of this security in
     violation of the foregoing."

          Each Global Note shall also bear the following legend on the face
     thereof:

          Unless and until it is exchanged in whole or in part for securities in
     definitive form, this security may not be transferred except as a whole by
     the depository to a nominee of the depository, or by any such nominee of
     the depository, or by the depository or nominee of such successor
     depository or any such nominee to a successor depository or a nominee of
     such successor depository. Unless this certificate is presented by an
     authorized representative of The Depository Trust Company, a New York
     corporation ("DTC"), to an issuer or its agent for registration of
     transfer, exchange or payment, and



                                      -38-

     any certificate issued is registered in the name of Cede & Co. or such
     other name as is requested by an authorized representative of DTC (and any
     payment hereon is made to Cede & Co. or to such other entity as is
     requested by an authorized representative of DTC), any transfer, pledge or
     other use hereof for value or otherwise by or to any person is wrongful
     inasmuch as the registered owner hereof, Cede & Co., has an interest
     herein.

          Transfers of this global note shall be limited to transfers in whole,
     but not in part, to nominees of Cede & Co. or to a successor thereof or
     such successor's nominee and transfers of portions of this global note
     shall be limited to transfers made in accordance with the restrictions set
     forth in Section 2.14 of the Indenture referred to herein.

          SECTION 2.14. Special Transfer Provisions.

          (a)  Transfers to Non-QIB Institutional Accredited Investors and
Non-U.S. Persons. The following provisions shall apply with respect to the
registration of any proposed transfer of a Security constituting a Restricted
Security to any Institutional Accredited Investor which is not a QIB or to any
Non-U.S. Person:

          (i)  the Registrar shall register the transfer of any Note
     constituting a Restricted Security whether or not such Note bears the
     Private Placement Legend, if (x) the requested transfer is after the second
     anniversary of the Issue Date (provided, however, that neither Terra
     Capital nor any Affiliate of Terra Capital has held any beneficial interest
     in such Note, or portion thereof, at any time on or prior to the second
     anniversary of the Issue Date) or (y) (1) in the case of a transfer to an
     Institutional Accredited Investor which is not a QIB (excluding Non-U.S.
     Persons), the proposed transferee has delivered to the Registrar a
     certificate substantially in the form of Exhibit C hereto and any legal
     opinions and certifications required thereby or (2) in the case of a
     transfer to a Non-U.S. Person, the proposed transferor has delivered to the
     Registrar a certificate substantially in the form of Exhibit D hereto; and

          (ii) if the proposed transferor is a Participant holding a beneficial
     interest in the Global Note, upon receipt by the Registrar of (x) the
     certificate, if any, required by paragraph (i) above and (y) written
     instructions given in accordance with the Depository's and the Registrar's
     procedures,

whereupon (a) the Registrar shall reflect on its books and records the date and
(if the transfer does not involve a transfer of outstanding Physical Notes) a
decrease in the principal amount of such Global Note in an amount equal to the
principal amount of the beneficial interest in the Global Note to be
transferred, and (b) Terra Capital shall execute, the Guarantors shall execute
the Guarantees on, and the Trustee shall authenticate and deliver, one or more
Physical Notes of like tenor and amount.

          (b)  Transfers to QIBs. The following provisions shall apply with
respect to the registration of any proposed transfer of a Security constituting
a Restricted Security to a QIB (excluding transfers to Non-U.S. Persons):

          (i)  the Registrar shall register the Transfer if such Transfer is
     being made by a proposed transferor who has checked the box provided for on
     the form of Note stating, or has



                                      -39-

     otherwise advised Terra Capital and the Registrar in writing, that the sale
     has been made in compliance with the provisions of Rule 144A to a
     transferee who has signed the certification provided for on the form of
     Note stating, or has otherwise advised Terra Capital and the Registrar in
     writing, that it is purchasing the Note for its own account or an account
     with respect to which it exercises sole investment discretion and that it
     and any such account is a QIB within the meaning of Rule 144A, and is aware
     that the sale to it is being made in reliance on Rule 144A and acknowledges
     that it has received such information regarding Terra Capital as it has
     requested pursuant to Rule 144A or has determined not to request such
     information and that it is aware that the transferor is relying upon its
     foregoing representations in order to claim the exemption from registration
     provided by Rule 144A; and

          (ii) if the proposed transferee is a Participant, and the Notes to be
     transferred consist of Physical Notes which after transfer are to be
     evidenced by an interest in a Global Note, upon receipt by the Registrar of
     written instructions given in accordance with the Depository's and the
     Registrar's procedures, the Registrar shall reflect on its books and
     records the date and an increase in the principal amount of such Global
     Note in an amount equal to the principal amount of the Physical Notes to be
     transferred, and the Trustee shall cancel the Physical Notes so
     transferred.

          (c)  Private Placement Legend. Upon the transfer, exchange or
replacement of Securities not bearing the Private Placement Legend, the
Registrar shall deliver Notes that do not bear the Private Placement Legend.
Upon the transfer, exchange or replacement of Notes bearing the Private
Placement Legend, the Registrar shall deliver only Notes that bear the Private
Placement Legend unless (i) the requested transfer is after the second
anniversary of the Issue Date (provided, however, that neither Terra Capital nor
any Affiliate of Terra Capital has held any beneficial interest in such Note, or
portion thereof, at any time prior to or on the second anniversary of the Issue
Date), or (ii) there is delivered to the Registrar an Opinion of Counsel
reasonably satisfactory to Terra Capital and the Trustee to the effect that
neither such legend nor the related restrictions on transfer are required in
order to maintain compliance with the provisions of the Securities Act.

          (d) General. By its acceptance of any Note bearing the Private
Placement Legend, each Holder of such a Note acknowledges the restrictions on
transfer of such Note set forth in this Indenture and in the Private Placement
Legend and agrees that it will transfer such Note only as provided in this
Indenture.

          The Registrar shall retain copies of all letters, notices and other
written communications received pursuant to Section 2.6 or this Section 2.14.
Terra Capital shall have the right to inspect and make copies of all such
letters, notices or other written communications at any reasonable time during
the Registrar's normal business hours upon the giving of reasonable written
notice to the Registrar.

          (e) Transfers of Notes Held by Affiliates. Any certificate (i)
evidencing a Note that has been transferred to an Affiliate of Terra Capital
within two years after the Issue Date, as evidenced by a notation on the
Assignment Form for such transfer or in the representation letter delivered in
respect thereof or (ii) evidencing a Note that has been acquired from an
Affiliate (other than by an Affiliate) in a transaction or a chain of
transactions not involving any public offering, shall, until two



                                      -40-

years after the last date on which either Terra Capital or any Affiliate of
Terra Capital was an owner of such Note, in each case, bear a legend in
substantially the form set forth in Section 2.13, unless otherwise agreed by
Terra Capital (with written notice thereof to the Trustee).

                                   ARTICLE 2

                                   REDEMPTION

          SECTION 2.1. Notices to Trustee. If Terra Capital elects to redeem
Notes pursuant to paragraph 5 thereof, it shall notify the Trustee in writing of
the redemption date, the principal amount of Notes to be redeemed and the
paragraph of the Notes pursuant to which the redemption will occur. Terra
Capital shall give each notice to the Trustee provided for in this Section at
least 45 days before the redemption date unless the Trustee consents to a
shorter period. Such notice shall be accompanied by an Officers' Certificate
from Terra Capital to the effect that such redemption will comply with the
provisions herein.

          SECTION 2.2. Selection of Notes To Be Redeemed. If fewer than all the
Notes are to be redeemed, the Trustee shall select the Notes to be redeemed on a
pro rata basis or by lot or by such other method that complies with applicable
legal and securities exchange requirements, if any, and that the Trustee in its
sole discretion shall deem to be fair and appropriate and in accordance with
methods generally used at the time of selection by fiduciaries in similar
circumstances. The Trustee shall make the selection from outstanding Notes not
previously called for redemption. Notes and portions of them the Trustee selects
shall be in amounts of $1,000 or a whole multiple of $1,000. Provisions of this
Indenture that apply to Notes called for redemption also apply to portions of
Notes called for redemption. The Trustee shall notify Terra Capital promptly of
the Notes or portions of Notes to be redeemed. If any Note is to be redeemed in
part only, the notice of redemption relating to such Note shall state the
portion of the principal amount thereof to be redeemed. A new Note in principal
amount equal to the unredeemed portion thereof will be issued in the name of the
Holder thereof upon cancellation of the original Note. In the event Terra
Capital is required to make an offer to purchase Notes pursuant to Section 4.8,
4.13 or 4.15 and the amount available for such offer is not evenly divisible by
$1,000, the Trustee shall promptly refund to Terra Capital any remaining funds,
which in no event will exceed $1,000.

          SECTION 2.3. Notice of Redemption. At least 30 days but not more than
60 days before a date for redemption of Notes, Terra Capital shall mail a notice
of redemption by first-class mail to the registered address appearing in the
Notes Register of each Holder of Notes to be redeemed. The notice shall identify
the Notes to be redeemed and shall state:

          (1)  the redemption date;

          (2)  the redemption price;

          (3)  the name and address of the Paying Agent;

          (4)  that Notes called for redemption must be surrendered to the
     Paying Agent to collect the redemption price;



                                      -41-

          (5) if fewer than all the outstanding Notes are to be redeemed, the
     identification and principal amounts of the particular Notes to be
     redeemed;

          (6) that, unless Terra Capital defaults in making such redemption
     payment, interest on Notes (or portion thereof) called for redemption
     ceases to accrue on and after the redemption date;

          (7) the paragraph of the Notes pursuant to which the Notes called for
     redemption are being redeemed;

          (8) the CUSIP number, if any, printed on the Notes being redeemed; and

          (9) that no representation is made as to the correctness or accuracy
     of the CUSIP number, if any, listed in such notice or printed on the Notes.

          At Terra Capital's request, the Trustee shall give the notice of
redemption in Terra Capital's name and at Terra Capital's sole expense. In such
event, Terra Capital shall provide the Trustee with the information required by
this Section.

          SECTION 3.4. Effect of Notice of Redemption. Once notice of redemption
is mailed, Notes called for redemption become due and payable on the redemption
date and at the redemption price stated in the notice. A notice of redemption
may not be conditional. Upon surrender to the Paying Agent, such Notes shall be
paid at the redemption price stated in the notice, plus accrued interest to the
redemption date. Such notice if mailed in the manner herein provided shall be
conclusively presumed to have been given, whether or not the Holder receives
such notice. Failure to give notice or any defect in the notice to any Holder
shall not affect the validity of the notice to any other Holder.

          SECTION 3.5. Deposit of Redemption Price. Prior to 11:00 a.m. (New
York City time) on the redemption date, Terra Capital shall deposit with the
Trustee or Paying Agent (or, if Parent or a Subsidiary is the Paying Agent,
shall segregate and hold in trust) money sufficient to pay the redemption price
of and accrued interest (if any) on all Notes or portions thereof to be redeemed
on that date other than Notes or portions of Notes called for redemption which
have been delivered by Terra Capital to the Trustee for cancellation.

          SECTION 3.6. Notes Redeemed in Part. Upon surrender of a Note that is
redeemed in part (with, if Terra Capital or the Trustee so requires, due
endorsemen by, or a written instrument of transfer in form satisfactory to
Terra Capital and the Trustee duly executed by, the Holder thereof or his
attorney duly authorized in writing), Terra Capital shall execute, and the
Trustee shall authenticate and deliver to the Holder of such Note without
service charge, a new Note or Notes of any authorized denomination as requested
by such Holder, in aggregate principal amount equal to and in exchange for the
unredeemed portion of the principal of the Note so surrendered, except that if a
Global Note is so surrendered, Terra Capital shall execute, and the Trustee
shall authenticate and deliver to the Depository for such Global Note, without
service charge, a new Global Note in denomination equal to and in exchange for
the unredeemed portion of the principal of the Global Note so surrendered.



                                      -42-

                                    ARTICLE 4

                                    COVENANTS

          SECTION 4.1. Payment of Notes. Terra Capital shall promptly pay the
principal of and interest on the Notes on the dates and in the manner provided
in the Notes and in this Indenture. Principal and interest shall be considered
paid on the date due if on such date the Trustee or the Paying Agent holds in
accordance with this Indenture money sufficient to pay all principal and
interest then due. Terra Capital shall pay interest on overdue principal at 1%
per annum in excess of the rate per annum set forth in the Notes, and it shall
pay interest on overdue installments of interest at the same rate to the extent
lawful. Interest will be computed on a basis of a 360-day year of twelve 30-day
months.

          SECTION 4.2. Corporate Existence. Subject to Article 5 and Section
4.13, Parent shall do or caused to be done, at its own cost and expense, all
things necessary to, and will cause each Restricted Subsidiary to, preserve and
keep in full force and effect the corporate or partnership existence and rights
(charter and statutory), licenses and/or franchises of Parent and each
Restricted Subsidiary; provided, however, that neither Parent nor any Restricted
Subsidiary shall be required to preserve any such rights, licenses or franchises
if the Board of Directors shall reasonably determine that the preservation
thereof is no longer desirable in the conduct of the business of Terra Capital
and its Subsidiaries, taken as a whole.

          SECTION 4.3. Maintenance of Office or Agency. Terra Capital shall
maintain in the Borough of Manhattan, the City of New York, an office or agency
(which may be an office or agency of the Trustee, Registrar or co-Registrar),
where Notes may be surrendered for registration of transfer or exchange or for
presentation for payment and where notices and demands to or upon Terra Capital
in respect of the Notes and this Indenture may be served. Terra Capital will
give prompt written notice to the Trustee of the location, and any change in the
location, of such office or agency. If at any time Terra Capital shall fail to
maintain any such required office or agency or shall fail to furnish the Trustee
with the address thereof, such presentations, surrenders, notices and demands
may be made or served at the address of the Trustee's office located in New York
City.

          Terra Capital may also from time to time designate one or more other
offices or agencies where the Notes may be presented or surrendered for any or
all such purposes and may from time to time rescind such designations; provided,
however, that no such designation or rescission shall in any manner relieve
Terra Capital of its obligation to maintain an office or agency in the Borough
of Manhattan, the City of New York, for such purposes. Terra Capital will give
prompt written notice to the Trustee of any such designation or rescission and
of any change in the location of any such other office or agency.

          Terra Capital hereby initially designates the Trustee's office or
agency in New York City as an agency of Terra Capital in accordance with Section
2.3.

          SECTION 4.4. Payment of Taxes and Other Claims. Parent shall, and
shall cause each of its Subsidiaries to, pay or discharge or cause to be paid or
discharged, before the same shall become delinquent, all taxes, assessments and
governmental charges levied or imposed upon its or its



                                      -43-

Subsidiaries' income, profits or property; provided, however, that none of
Parent or its Subsidiaries shall be required to pay or discharge or cause to be
paid or discharged any such tax, assessment, charge or claim whose amount,
applicability or validity is being contested in good faith by appropriate
negotiations or proceedings and for which disputed amounts adequate reserves
have been made in accordance with GAAP.

          SECTION 4.5. Additional Guarantees.

          (a) If Parent or any Restricted Subsidiary Transfers, acquires or
creates another Restricted Subsidiary (other than any Foreign Subsidiary) after
the date of this Indenture, then that newly acquired or created Restricted
Subsidiary shall, within ten Business Days of the date on which it was acquired
or created, execute and deliver to the Trustee (1) a supplemental indenture in
form reasonably satisfactory to the Trustee pursuant to which such Restricted
Subsidiary shall fully and unconditionally guarantee all of Issuer's obligations
under the Notes and this Indenture on the terms set forth in this Indenture and
(2) Security Documents in the appropriate forms annexed hereto with such changes
as shall be reasonably satisfactory to the Trustee pursuant to which such
Restricted Subsidiary shall grant to the Trustee a second priority security
interest in and Lien on its assets constituting Collateral. Thereafter, such
Restricted Subsidiary shall be a Guarantor for all purposes of this Indenture
until released in accordance with Section 10.6.

          (b) If TNCLP becomes a Wholly Owned Subsidiary, TNCLP and TNLP shall,
concurrently with the release of the limited partnership interests in TNCLP from
the Lien securing the 2008 Notes, execute and deliver to the Trustee a
supplemental indenture in form reasonably satisfactory to the Trustee pursuant
to which TNCLP and TNLP shall fully and unconditionally guarantee all of
Issuer's obligations under the Notes and this Indenture on the terms set forth
in Article 10. Thereafter, each of TNCLP and TNLP shall be a Guarantor for all
purposes of this Indenture until released in accordance with Section 10.6.

          SECTION 4.6. SEC Reports. Whether or not Terra Capital and the
Guarantors are then subject to Section 13(a) or 15(d) of the Exchange Act, Terra
Capital and the Guarantors shall electronically file with the Commission, so
long as the Notes are outstanding, the annual reports, quarterly reports and
other periodic reports that Terra Capital and the Guarantors would be required
to file with the Commission pursuant to Section 13(a) or 15(d) if Terra Capital
and the Guarantors were so subject, and such documents shall be filed with the
Commission on or prior to the respective dates (the "Required Filing Dates") by
which Issuer and the Guarantors would be required so to file such documents if
Terra Capital and the Guarantors were so subject, unless, in any case, if such
filings are not then permitted by the Commission.

          If such filings with Commission are not then permitted by the
Commission, or such filings are not generally available on the Internet free of
charge, Issuer and the Guarantors will, within 15 days of each Required Filing
Date, transmit by mail to noteholders, as their names and addresses appear in
the Note register, without cost to such noteholders, and file with the Trustee
copies of the annual reports, quarterly reports and other periodic reports that
Issuer and the Guarantors would be required to file with the Commission pursuant
to Section 13(a) or 15(d) of the Exchange Act if Issuer and the Guarantors were
subject to such Section 13(a) or 15(d), and promptly upon written request,
supply copies of such documents to any prospective holder or beneficial owner at
Issuer's cost.



                                      -44-

          SECTION 4.7. Compliance Certificate. Issuer shall deliver to the
Trustee within 120 days after the end of each fiscal year of Issuer an Officers'
Certificate, one of the signers of which shall be the principal executive,
financial or accounting officer of Issuer, stating that in the course of the
performance by the signers of their duties as Officers of Issuer they would
normally have knowledge of any Default and whether or not the signers know of
any Default that occurred during such period. If they do, the certificate shall
describe the Default, its status and what action Issuer is taking or proposes to
take with respect thereto. Issuer and the Guarantors also shall comply with TIA
Section 314(a)(4).

          SECTION 4.8. Change of Control.

          (a) Upon the occurrence of a Change of Control, each Holder shall have
the right to require Terra Capital to purchase all or a portion (equal to $1,000
or an integral multiple thereof) of such Holder's Notes at a purchase price in
cash equal to 101% of the principal amount thereof, plus accrued and unpaid
interest, if any, to the date of purchase (subject to the right of Holders of
record on the relevant record date to receive interest due on an interest
payment date that is on or prior to the date fixed for redemption), in
accordance with the terms contemplated in Section 4.8(b).

          (b) Within 30 days following any Change of Control, Terra Capital
shall mail a notice to each Holder, with a copy to the Trustee, stating

          (1) that a Change of Control has occurred and that such Holder has the
     right to require Terra Capital to purchase such Holder's Notes at a
     purchase price in cash equal to 101% of the principal amount thereof, plus
     accrued and unpaid interest, if any, to the date of purchase (subject to
     the right of Holders of record on the relevant record date to receive
     interest on an interest payment date that is on or prior to the date fixed
     for purchase);

          (2) the circumstances and relevant facts and relevant financial
     information regarding such Change of Control;

          (3) the purchase date (which shall be no earlier than 30 days nor
     later than 60 days from the date such notice is mailed); and

          (4) the instructions as determined by Terra Capital, consistent with
     this Section 4.8, that a Holder must follow in order to have its Notes
     purchased.

          (c) Holders electing to have a Note purchased will be required to
surrender the Note, together with all necessary endorsements and other
appropriate materials duly completed, to Terra Capital at the address specified
in the notice at least three Business Days prior to the purchase date. Holders
will be entitled to withdraw their election if the Trustee or Terra Capital
receives not later than one Business Day prior to the purchase date, a facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of the Note which was delivered for purchase by the Holder as to which
such notice of withdrawal is being submitted and a statement that such Holder is
withdrawing its election to have such Note purchased.



                                      -45-

          (d) On the purchase date, all Notes purchased by Terra Capital under
this Section 4.8 shall be delivered to the Trustee for cancellation, and Terra
Capital shall pay the purchase price plus accrued and unpaid interest, if any,
to the Holders entitled thereto.

          (e) Terra Capital shall comply, to the extent applicable, with the
requirements of Section 14(e) of the Exchange Act and any other securities laws
or regulations in connection with the repurchase of Notes pursuant to this
Section 4.8. To the extent that the provisions of any securities laws or
regulations conflict with the provisions of this Section 4.8, Terra Capital
shall comply with the applicable securities laws and regulations and shall not
be deemed to have breached its obligations under the covenant described
hereunder by virtue thereof.

          (f) Notwithstanding the occurrence of a Change of Control, Terra
Capital shall not be obligated to purchase the Notes or otherwise comply with
this Section 4.8 if Terra Capital has irrevocably elected to redeem all the
Notes in accordance with paragraph 5 thereof; provided that Terra Capital does
not default in its redemption obligations pursuant to such election.

          SECTION 4.9. Limitation on Incurrence of Indebtedness.

          (a) Parent shall not, and shall not permit any Restricted Subsidiary
to, incur, directly or indirectly, any Indebtedness; provided that Issuer or any
Guarantor may incur Indebtedness if, immediately after giving effect to such
incurrence, the Consolidated Coverage Ratio is at least 2.0 to 1.0 (this
proviso, the "Coverage Ratio Exception").

          (b) The foregoing Section 4.9(a) will not prohibit incurrence of the
following Indebtedness (collectively, "Permitted Indebtedness"):

          (1) the Notes issued on the Issue Date and any related Guarantees;

          (2) Indebtedness of Parent or any Restricted Subsidiary to the extent
     outstanding on the Issue Date (other than Indebtedness under the Credit
     Facility);

          (3) Indebtedness of Parent or any Restricted Subsidiary under the
     Credit Facility in an aggregate amount at any time outstanding pursuant to
     this clause (3) (including amounts outstanding on the date of this
     Indenture) not to exceed the greater of:

              (x) $225.0 million; and

              (y) the sum of (x) 70% of the net book value of the inventory of
          Parent and the Restricted Subsidiaries and (y) 85% of the net book
          value of the accounts receivable of Parent and the Restricted
          Subsidiaries, in each case determined on a consolidated basis in
          accordance with GAAP;

          (4) Refinancing Indebtedness in respect of Indebtedness incurred
     pursuant to the Coverage Ratio Exception, clause (1) of this paragraph
     (including the Exchange Notes and any Guarantees thereof), clause (2) of
     this paragraph (other than any Indebtedness owed to Parent or any of its
     Subsidiaries) or this clause (4);



                                      -46-

          (5)  Indebtedness owed by Parent or any Restricted Subsidiary to
     Parent or any Restricted Subsidiary; provided that

               (x) any such Indebtedness owed by Issuer shall be subordinated by
          its terms to the prior payment in full in cash of all Obligations with
          respect to the Notes, and any such Indebtedness owed by any Guarantor
          (other than to Issuer or any other Guarantor) shall be subordinated by
          its terms to the prior payment in full in cash of all Obligations with
          respect to the Guarantee of such Guarantor; and

               (y) if such Indebtedness is held by a Person other than Parent or
          any Restricted Subsidiary, Parent or such Restricted Subsidiary shall
          be deemed to have incurred Indebtedness not permitted by this clause
          (5);

          (6)  (x) the guarantee by Issuer or any Guarantor of Indebtedness of
     Issuer or a Guarantor and (y) the guarantee by any Restricted Subsidiary
     that is not a Guarantor of Indebtedness of any other Restricted Subsidiary
     that is not a Guarantor; provided that, in each case, the Indebtedness
     being guaranteed is incurred pursuant to the Coverage Ratio Exception or is
     Permitted Indebtedness;

          (7)  Hedging Obligations;

          (8)  industrial revenue bonds or similar tax-exempt Indebtedness,
     Purchase Money Indebtedness and Capital Lease Obligations of Parent or any
     Restricted Subsidiary incurred to finance the acquisition, construction or
     improvement of any assets (including capital expenditures of Parent or any
     Restricted Subsidiary), and Refinancings thereof, in an aggregate amount
     not to exceed $15.0 million at any time outstanding;

          (9)  Indebtedness of any Foreign Subsidiary in an aggregate amount not
     to exceed $15.0 million at any time outstanding;

          (10) Indebtedness represented by letters of credit in order to provide
     security for workers' compensation claims, payment obligations in
     connection with self-insurance or similar requirements of Parent or any
     Restricted Subsidiary in the ordinary course of business;

          (11) customary indemnification, adjustment of purchase price or
     similar obligations, in each case, incurred in connection with the
     acquisition or disposition of any assets of Parent or any Restricted
     Subsidiary (other than guarantees of Indebtedness incurred by any Person
     acquiring all or any portion of such assets for the purpose of financing
     such acquisition);

          (12) obligations in respect of performance bonds and completion,
     guarantee, surety and similar bonds in the ordinary course of business;

          (13) Indebtedness arising from the honoring by a bank or other
     financial institution of a check, draft or similar instrument inadvertently
     (except in the case of daylight overdrafts)



                                      -47-

     drawn against insufficient funds; provided that such Indebtedness is
     extinguished within five Business Days of incurrence;

          (14) Indebtedness arising in connection with endorsement of
     instruments for deposit in the ordinary course of business;

          (15) Indebtedness consisting of take-or-pay obligations contained in
     supply agreements entered into in the ordinary course of business;

          (16) Indebtedness the net proceeds of which are used solely to pay
     Federal, state or local taxes arising as a result of any recharacterization
     of TNCLP or TNLP as an association taxable as a corporation as a result of
     changes after the Issue Date in law, regulation or the interpretation
     thereof by governmental authorities;

          (17) guarantees by Terra UK of Terra UK Customer Debt; provided that

               (x) the aggregate principal amount of the Indebtedness so
          guaranteed by Terra UK with respect to any customer at any time shall
          not exceed 50% of the aggregate principal amount of the Terra UK
          Customer Debt of such customer outstanding at such time; and

               (y) the aggregate principal amount of Terra UK Customer Debt
          guaranteed by Terra UK at any time during any fiscal year shall not
          exceed (x) (Pounds)15,000,000 minus (y) the aggregate amount of
          payments made by Terra UK under all such guarantees during such fiscal
          year; and

          (18) additional Indebtedness in an aggregate amount not to exceed
     $30.0 million at any time outstanding.

          (c)  For purposes of determining compliance with this Section 4.9, in
the event that an item of Indebtedness meets the criteria of more than one of
the categories of Permitted Indebtedness described in clauses (1) through (18)
above or is entitled to be incurred pursuant to the Coverage Ratio Exception,
Issuer shall, in its sole discretion, classify such item of Indebtedness and may
divide and classify such Indebtedness in more than one of the types of
Indebtedness described (except that Indebtedness outstanding under the Credit
Facility on the Issue Date shall be deemed to have been incurred under clause
(3) above) and may later reclassify such item into any one or more of the
categories of Indebtedness described in clauses (3) through (18) above (provided
that at the time of reclassification it meets the criteria in such category or
categories). The maximum amount of Indebtedness that Parent or any Restricted
Subsidiary may incur pursuant to this Section 4.9 will not be deemed to be
exceeded solely as the result of fluctuations in the exchange rates of
currencies. In determining the amount of Indebtedness outstanding under one of
the clauses above, the outstanding principal amount of any particular
Indebtedness of any Person shall be counted only once and any obligation of such
Person or any other Person arising under any guarantee, Lien, letter of credit
or similar instrument supporting such Indebtedness shall be disregarded so long
as it is permitted to be incurred by the Person or Persons incurring such
obligation.



                                      -48-

             (d) Notwithstanding the foregoing, Parent shall not, and shall not
permit Issuer or any other Guarantor to, incur any Indebtedness that purports to
be by its terms (or by the terms of any agreement or instrument governing such
Indebtedness) subordinated to any other Indebtedness of Parent, Issuer or of
such other Guarantor, as the case may be, unless such Indebtedness is also by
its terms made subordinated to the Notes or the Guarantee of such Guarantor, as
applicable, to at least the same extent as such Indebtedness is subordinated to
such other Indebtedness of Issuer or such Guarantor, as the case may be.

             SECTION 4.10. Limitation on Restricted Payments.

             (a) Parent shall not, and shall not permit any Restricted
Subsidiary to, directly or indirectly, declare or make a Restricted Payment if

             (1) a Default shall have occurred and is continuing or would result
         therefrom;

             (2) Issuer could not incur at least $1.00 of additional
         Indebtedness pursuant to the Coverage Ratio Exception; or

             (3) the aggregate amount of such Restricted Payment together with
         all other Restricted Payments (the amount of any Restricted Payments
         made in assets other than cash to be valued at its Fair Market Value)
         declared or made since the Issue Date (other than any Restricted
         Payment described in clause (2), (3), (4), (5), (6) or (8) of Section
         4.10(b)) would exceed the sum (the "Basket") of:

                 (i)   50% of the Consolidated Net Income accrued during the
             period (treated as one accounting period) from June 30, 2003 to the
             end of the most recent fiscal quarter prior to the date of such
             Restricted Payment for which internal financial statements are
             available (or, in case such Consolidated Net Income shall be a
             deficit, minus 100% of such deficit); plus

                 (ii)  the aggregate Net Cash Proceeds received by Parent from
             the issuance and sale (other than to a Subsidiary of Parent) of
             Qualified Stock subsequent to the Issue Date; plus

                 (iii) the amount by which Indebtedness or Disqualified Stock
             incurred or issued subsequent to the Issue Date is reduced on
             Parent's consolidated balance sheet upon the conversion or exchange
             (other than by a Subsidiary of Parent) into Qualified Stock (less
             the amount of any cash, or the Fair Market Value of any other
             asset, distributed by Parent or any Restricted Subsidiary upon such
             conversion or exchange); provided that such amount shall not exceed
             the aggregate Net Cash Proceeds received by Parent or any
             Restricted Subsidiary from the issuance and sale (other than to a
             Subsidiary of Parent) of such Indebtedness or Disqualified Stock;
             plus

                 (iv)  to the extent not included in the calculation of the
             Consolidated Net Income referred to in (i), an amount equal to,
             without duplication;



                                      -49-

                       (x) 100% of the aggregate net proceeds (including the
                 Fair Market Value of assets other than cash) received by Parent
                 or any Restricted Subsidiary upon the sale or other disposition
                 of any Investment (other than a Permitted Investment) made by
                 Parent or any Restricted Subsidiary since the Issue Date; plus

                       (y) the net reduction in Investments (other than
                 Permitted Investments) in any Person resulting from dividends,
                 repayments of loans or advances or other Transfers of assets
                 subsequent to the Issue Date, in each case to Parent or any
                 Restricted Subsidiary from such Person; plus

                       (z) to the extent that the Basket was reduced as the
                 result of the designation of an Unrestricted Subsidiary, the
                 portion (proportionate to Parent's equity interest in such
                 Subsidiary) of the Fair Market Value of the net assets of such
                 Unrestricted Subsidiary at the time such Unrestricted
                 Subsidiary is redesignated, or liquidated or merged into, a
                 Restricted Subsidiary;

             provided that the foregoing shall not exceed, in the aggregate, the
             amount of all Investments which previously reduced the Basket.

             (b) The provisions of Section 4.10(a) shall not prohibit the
         following:

             (1) dividends paid within 90 days after the date of declaration
         thereof if at such date of declaration such dividend would have been
         permitted under this Indenture;

             (2) any repurchase, redemption, retirement or other acquisition of
         Capital Stock or Subordinated Obligations made in exchange for, or out
         of the proceeds of the substantially concurrent issuance and sale
         (other than to a Subsidiary of Parent) of, Qualified Stock or, with
         respect to any such Subordinated Obligations, in exchange for or out of
         the proceeds of the substantially concurrent incurrence and sale (other
         than to a Subsidiary of Parent) of Refinancing Indebtedness thereof;
         provided that (x) no such exchange or issuance and sale shall increase
         the Basket and (y) no Default has occurred and is continuing or would
         occur as a consequence thereof;

             (3) the purchase, redemption, acquisition, cancellation or other
         retirement for a nominal value per right of any rights granted to all
         the holders of Common Stock of Parent pursuant to any shareholders'
         rights plan adopted for the purpose of protecting shareholders from
         unfair takeover tactics; provided that any such purchase, redemption,
         acquisition, cancellation or other retirement of such rights shall not
         be for the purpose of evading the limitations of this Section (all as
         determined in good faith by the Board of Directors);

             (4) payments by Parent or any Restricted Subsidiary in respect of
         Indebtedness of Parent or any Restricted Subsidiary owed to Parent or
         another Restricted Subsidiary;

             (5) repurchases of Capital Stock deemed to occur upon the exercise
         of stock options or warrants if such Capital Stock represents a portion
         of the exercise price thereof and



                                      -50-

         repurchases of Capital Stock deemed to occur upon the withholding of a
         portion of the Capital Stock granted or awarded to an employee to pay
         for the taxes payable by such employee upon such grant or award;

             (6) if no Default has occurred and is continuing or would occur as
         a consequence thereof, the declaration and payment of dividends to
         holders of any class or series of Designated Preferred Stock (other
         than Disqualified Stock) issued after the Issue Date; provided that, at
         the time of the issuance of such Designated Preferred Stock and after
         giving pro forma effect thereto, Issuer could incur at least $1.00 of
         additional Indebtedness pursuant to the Coverage Ratio Exception;

             (7) purchases of the Capital Stock, or contributions to the equity,
         of any Foreign Subsidiary to the extent that Investments in the form of
         Indebtedness advanced to such Foreign Subsidiary would, or are likely
         to, result in (x) any then existing Indebtedness owing by such Foreign
         Subsidiary to Parent or any Restricted Subsidiary being characterized
         as equity under the "thin capitalization" rules of the Code or under
         any other applicable law or (y) any similar consequences; or

             (8) Restricted Payments of up to $15.0 million in the aggregate
         since the Issue Date.

             SECTION 4.11. Limitation on Liens. Parent shall not, and shall not
permit any Restricted Subsidiary to, directly or indirectly, incur any Lien of
any kind on any asset of Parent or any Restricted Subsidiary (including Capital
Stock of a Restricted Subsidiary), whether owned at the Issue Date or thereafter
acquired, or any income or profits therefrom or assign or convey any right to
receive income therefrom, except:

             (1) in the case of any asset that does not constitute Collateral,
         Permitted Liens, unless the Notes and the Guarantees are secured on an
         equal and ratable basis with the obligations so secured until such time
         as such obligations are no longer secured by a Lien; and

             (2) in the case of any asset that constitutes Collateral, Liens of
         the type permitted thereon to the extent and for so long as such Liens
         secure or are permitted to be incurred under the Credit Facility;
         provided that such Liens shall not secure Indebtedness other than the
         Notes, the 2008 Notes and Indebtedness of the type described under
         clauses (3) and (7) of the definition of Permitted Indebtedness.

In the case of clause (1), if the obligations so secured are subordinated by
their terms to the Notes or a Guarantee, the Lien securing such obligations will
also be so subordinated by its terms at least to the same extent.

             SECTION 4.12. Limitation on Transactions with Affiliates. (a)
Parent shall not, and shall not permit any Restricted Subsidiary to, directly or
indirectly, in one transaction or series of related transactions, transfer any
of its assets to, or purchase any assets from, or enter into any contract,
agreement, understanding, loan, advance or guarantee with, or for the benefit
of, any affiliate of Parent (an "Affiliate Transaction"), unless the terms
thereof are no less favorable to Parent or such



                                      -51-

Restricted Subsidiary than those that could be obtained at the time of such
transaction in arm's-length dealings with a Person that is not such an
affiliate; provided that the Board of Directors must approve each Affiliate
Transaction that involves aggregate payments or other assets or services with a
Fair Market Value in excess of $5.0 million. This approval must be evidenced by
a board resolution that states that the Board of Directors has determined that
the transaction complies with the foregoing provisions; provided, further that
if Parent or any Restricted Subsidiary enters into an Affiliate Transaction that
involves aggregate payments or other assets or services with a Fair Market Value
in excess of $15.0 million, then prior to the consummation of such Affiliate
Transaction, Parent must obtain a favorable opinion from an Independent
Financial Advisor that it has determined such Affiliate Transaction to be fair,
from a financial point of view, to the Holders, and deliver that opinion to the
Trustee.

             (b) The provisions of clause (a) above will not prohibit the
         following:

             (1) transactions exclusively between or among (a) Parent and one or
         more Restricted Subsidiaries or (b) Restricted Subsidiaries; provided,
         in each case, that no affiliate of Parent (other than another
         Restricted Subsidiary) owns Capital Stock in any such Restricted
         Subsidiary;

             (2) customary director, officer and employee compensation
         (including bonuses) and other benefits (including retirement, health,
         stock option and other benefit plans) and indemnification arrangements,
         in each case approved by the Board of Directors;

             (3) the entering into of a tax sharing agreement, or payments
         pursuant thereto, between Parent and/or one or more Subsidiaries, on
         the one hand, and any other Person with which Parent or such
         Subsidiaries are required or permitted to file a consolidated tax
         return or with which Parent or such Subsidiaries are part of a
         consolidated group for tax purposes, on the other hand, which payments
         by Parent and the Restricted Subsidiaries are not in excess of the tax
         liabilities that would have been payable by them on a stand-alone
         basis;

             (4) loans and advances permitted by clause (6) of the definition of
         "Permitted Investments";

             (5) Restricted Payments of the type described in clause (i), (ii)
         or (iii) of the definition of "Restricted Payment" and which are made
         in accordance with Section 4.10;

             (6) any transaction with an affiliate where the only consideration
         paid by Parent or any Restricted Subsidiary is Qualified Stock;

             (7) the provision of management, financial and operational services
         by Parent and its Subsidiaries to affiliates of Parent in which Parent
         or any Restricted Subsidiary has an Investment and the payment of
         compensation for such services; provided that the Board of Directors
         has determined that the provision of such services is in the best
         interests of Parent and the Restricted Subsidiaries;



                                      -52-

             (8)  transactions between Parent or any Subsidiary and any
         Securitization Entity in connection with a Qualified Securitization
         Transaction, in each case provided that such transactions are not
         otherwise prohibited by this Indenture;

             (9)  transactions with a Person that is an affiliate solely because
         Parent or any Restricted Subsidiary owns Capital Stock in such Person;
         provided that no affiliate of Parent (other than a Restricted
         Subsidiary) owns Capital Stock in such Person; or

             (10) purchases and sales of raw materials or inventory in the
         ordinary course of business on market terms.

             SECTION 4.13. Limitation on Asset Sales.

             (a) Parent shall not, and shall not permit any Restricted
Subsidiary to, directly or indirectly, consummate any Asset Sale unless:

             (i) Parent or such Restricted Subsidiary receives consideration at
         the time of such Asset Sale at least equal to the Fair Market Value of
         the assets included in such Asset Sale; and

             (ii) at least 85% of the total consideration received in such Asset
         Sale consists of cash, Temporary Cash Investments or assets referred to
         in clause (c) below, in each case, valued at the Fair Market Value
         thereof, or a combination of the foregoing.

             (b) For purposes of Section 4.13(a)(ii) above, the following shall
be deemed to be cash:

             (x) the amount (without duplication) of any Indebtedness (other
         than Subordinated Obligations) of Parent or such Restricted Subsidiary
         that is expressly assumed by the Transferee in such Asset Sale and with
         respect to which Parent or such Restricted Subsidiary, as the case may
         be, is unconditionally released by the holder of such Indebtedness; and

             (y) the amount of any obligations received from such Transferee
         that are within 60 days repaid, converted into or sold or otherwise
         disposed of for cash or Temporary Cash Investments (to the extent of
         the cash or Temporary Cash Investments actually so received).

             (c) If at any time any non-cash consideration received by Parent or
any Restricted Subsidiary in connection with any Asset Sale is repaid, converted
into or sold or otherwise disposed of for cash or Temporary Cash Investments
(other than interest received with respect to any such non-cash consideration),
then the date of such repayment, conversion, sale or other disposition shall be
deemed to constitute the date of an Asset Sale hereunder and the Net Available
Proceeds thereof shall be applied in accordance with this Section 4.13.

             (d) If Parent or any Restricted Subsidiary engages in an Asset
Sale, Parent or a Restricted Subsidiary shall, no later than 365 days following
the consummation thereof, apply an amount equal to all or any of the Net
Available Proceeds therefrom as follows:



                                      -53-

             (i)   to repay borrowings owing under the Credit Facility in
         accordance with the Credit Facility;

             (ii)  to redeem, purchase or repay 2008 Notes that are outstanding
         on the Issue Date; and/or

             (iii) to make an investment in or expenditure for assets (including
         Capital Stock of any Person) that replace the assets that were the
         subject of the Asset Sale or in assets (including Capital Stock of any
         Person) that will be used in the Permitted Business.

             (e) The amount of Net Available Proceeds not applied or invested as
provided in Section 4.13(d) will constitute "Excess Proceeds."

             (f) If at any time the aggregate amount of Excess Proceeds not
theretofore subject to a Net Proceeds Offer (as defined below) totals at least
$15.0 million, Issuer shall, not later than 10 Business Days after the end of
the period during which Issuer is required to apply such Excess Proceeds
pursuant to Section 4.13(d) (or, if Issuer so elects, at any time within such
period), make an offer (a "Net Proceeds Offer") to purchase from the Holders of
Notes (determined on a pro rata basis according to the accreted value or
principal amount, as the case may be, of the Notes) that may be purchased out of
the Excess Proceeds (rounded down to the nearest multiple of $1,000) on such
date, at a purchase price equal to 100% of the principal amount of such Notes,
plus accrued and unpaid interest, if any, to the date of purchase. Upon
completion of a Net Proceeds Offer the amount of Excess Proceeds remaining after
application pursuant to such Net Proceeds Offer (a "Net Proceeds Deficiency")
(including payment of the purchase price for Notes duly tendered) may be used by
Issuer for general corporate purposes (to the extent not otherwise prohibited by
this Indenture); provided that to the extent that all or a portion of the Net
Proceeds Deficiency is comprised of proceeds from the Transfer of Collateral,
such proceeds shall remain subject to the Lien of this Indenture and the
applicable Security Documents.

             (g) Within 30 days after Issuer becomes obligated to make a Net
Proceeds Offer, Issuer shall be obligated to deliver to the Trustee and send, by
first-class mail to each Holder, at the address appearing in the Notes Register,
a written notice stating that the Holder may elect to have his Securities
purchased by Issuer either in whole or in part (subject to prorationing as
hereinafter described in the event the Net Proceeds Offer is oversubscribed) in
integral multiples of $1,000 of principal amount, at the applicable purchase
price. The notice, which shall govern the terms of the Net Proceeds Offer, shall
include such disclosures as are required by law and shall specify (i) that the
Net Proceeds Offer is being made pursuant to this Section 4.13; (ii) the
purchase price (including the amount of accrued interest, if any) for each Note
and the purchase date not less than 30 days nor more than 60 days after the date
of such notice (the "Purchase Date"); (iii) that any Note not tendered or
accepted for payment will continue to accrue interest in accordance with the
terms thereof; (iv) that, unless Issuer defaults on making the payment, any Note
accepted for payment pursuant to the Net Proceeds Offer shall cease to accrue
interest on and after the Purchase Date; (v) that Holders electing to have
Securities purchased pursuant to a Net Proceeds Offer will be required to
surrender their Notes to the Paying Agent at the address specified in the notice
at least three Business Days prior to the Purchase Date and must complete any
form letter of transmittal proposed by Issuer and acceptable to the Trustee and
the Paying Agent; (vi) that Holders will be entitled to withdraw their election
if the Paying



                                      -54-

Agent receives, not later than one Business Day prior to the Purchase Date, a
telex, facsimile transmission or letter setting forth the name of the Holder,
the principal amount of Securities the Holder delivered for purchase, the Note
certificate number (if any) and a statement that such Holder is withdrawing its
election to have such Notes purchased; (vii) that if Notes in a principal amount
in excess of the aggregate principal amount which Issuer has offered to purchase
are tendered pursuant to the Net Proceeds Offer, Issuer shall purchase Notes on
a pro rata basis among the Notes tendered (with such adjustments as may be
deemed appropriate by Issuer so that only Notes in denominations of $1,000 or
integral multiples of $1,000 shall be acquired); (viii) that Holders whose Notes
are purchased only in part will be issued new Securities equal in principal
amount to the unpurchased portion of the Notes surrendered; and (ix) the
instructions that Holders must follow in order to tender their Notes.

             (h) Not later than the date upon which written notice of a Net
Proceeds Offer is delivered to the Trustee as provided below, Issuer shall
deliver to the Trustee an Officers' Certificate as to (i) the amount of the Net
Proceeds Offer (the "Net Proceeds Offer Amount"), (ii) the allocation of the Net
Available Proceeds from the Asset Sales pursuant to which such Net Proceeds
Offer is being made, and (iii) the compliance of such allocation with the
provisions of Section 4.13(a). Upon the expiration of the period for which the
Net Proceeds Offer remains open (the "Net Proceeds Offer Period"), Issuer shall
deliver to the Trustee for cancellation the Notes or portions thereof which have
been properly tendered to and are to be accepted by Issuer. Not later than 11:00
a.m. (New York City time) on the Purchase Date, Issuer shall irrevocably deposit
with the Trustee or with a paying agent (or, if Issuer is acting as Paying
Agent, segregate and hold in trust) an amount in cash sufficient to pay the Net
Proceeds Offer Amount for all Notes properly tendered to and accepted by Issuer.
The Trustee shall, on the Purchase Date, mail or deliver payment to each
tendering Holder in the amount of the purchase price.

             (i) Holders electing to have a Note purchased will be required to
surrender the Note, together with all necessary endorsements and other
appropriate materials duly completed, to Issuer at the address specified in the
notice at least three Business Days prior to the Purchase Date. Holders will be
entitled to withdraw their election in whole or in part if the Trustee or Issuer
receives not later than one Business Day prior to the Purchase Date, a facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of the Note (which shall be $1,000 or an integral multiple thereof) which
was delivered for purchase by the Holder, the aggregate principal amount of such
Note (if any) that remains subject to the original notice of the Net Proceeds
Offer and that has been or will be delivered for purchase by Issuer and a
statement that such Holder is withdrawing his election to have such Note
purchased. If at the expiration of the Net Proceeds Offer Period the aggregate
principal amount of Notes surrendered by Holders exceeds the Net Proceeds Offer
Amount, Issuer shall select the Notes to be purchased on a pro rata basis (with
such adjustments as may be deemed appropriate by Issuer so that only securities
in denominations of $1,000, or integral multiples thereof, shall be purchased).
Holders whose Notes are purchased only in part will be issued new Notes equal in
principal amount to the unpurchased portion of the Notes surrendered.

             (j) A Note shall be deemed to have been accepted for purchase at
the time the Trustee, directly or through an agent, mails or delivers payment
therefor to the surrendering Holder.

             (k) In the event of the Transfer of substantially all (but not all)
of the assets of Parent and the Restricted Subsidiaries as an entirety to a
Person in a transaction covered by and ef-



                                      -55-

fected in accordance with Section 5.1 the Transferee shall be deemed to have
sold for cash at Fair Market Value the assets of Parent and the Restricted
Subsidiaries not so Transferred for purposes of this Section 4.13, and shall
comply with the provisions of this Section 4.13 with respect to such deemed sale
as if it were an Asset Sale (with such Fair Market Value being deemed to be Net
Available Proceeds for such purpose).

             (l) Issuer shall comply, to the extent applicable, with the
requirements of Section 14(d) of the Exchange Act and any other securities laws
or regulations in connection with any purchase of Notes pursuant to this
Indenture. To the extent that the provisions of any securities laws or
regulations conflict with the provisions of this Indenture, Issuer shall comply
with the applicable securities laws and regulations and will not be deemed to
have breached its obligations under this Indenture by virtue thereof.

             SECTION 3.14. Limitation on Dividend and Other Restrictions
Affecting Restricted Subsidiaries.

             Parent shall not, and shall not permit any Restricted Subsidiary
to, directly or indirectly, create or otherwise cause or permit to exist or
become effective any consensual encumbrance or consensual restriction on the
ability of any Restricted Subsidiary to:

             (a) pay dividends or make any other distributions on its Capital
         Stock to Parent or any other Restricted Subsidiary or pay any
         Indebtedness owed to Parent or any other Restricted Subsidiary,

             (b) make any loans or advances to, or guarantee any Indebtedness
         of, Parent or any other Restricted Subsidiary, or

             (c) Transfer any of its assets to Parent or any other Restricted
         Subsidiary, except:

                 (1) any encumbrance or restriction (A) pursuant to an agreement
             in effect at or entered into on the Issue Date (including this
             Indenture and the Credit Facility), as such encumbrance or
             restriction is in effect on the Issue Date and (B) in the Credit
             Facility having the effect of restricting Issuer or any Restricted
             Subsidiary from taking any of the actions described in clauses (a),
             (b) or (c) above with respect to, Parent or any intermediate
             holding company between Parent and Issuer;

                 (2) restrictions on the Transfer of assets subject to any Lien
             permitted under the Indenture imposed by the holder of such Lien;

                 (3) restrictions on the Transfer of assets imposed under any
             agreement to sell such assets permitted under this Indenture
             pending the closing of such sale;

                 (4) any instrument governing Acquired Indebtedness, which
             encumbrance or restriction is not applicable to any Person, or the
             assets of any Person, other than the Person or the assets of the
             Person so acquired;



                                      -56-

                 (5)  customary provisions in partnership agreements, limited
             liability company organizational governance documents, joint
             venture agreements and other similar agreements entered into in the
             ordinary course of business that restrict the Transfer of ownership
             interests in such partnership, limited liability company, joint
             venture or similar Person;

                 (6)  Purchase Money Indebtedness and Capital Lease Obligations
             incurred pursuant to clause (8) of the definition of "Permitted
             Indebtedness" that impose restrictions of the nature described in
             clause (c) above on the assets acquired;

                 (7)  any encumbrances or restrictions imposed by any amendments
             or Refinancings of the contracts, instruments or obligations
             referred to in clause (1), (4) or (6) above; provided that such
             amendments or Refinancings are, in the good faith judgment of the
             Board of Directors, no more materially restrictive with respect to
             such encumbrances and restrictions than those prior to such
             amendment or Refinancing;

                 (8)  covenants to maintain net worth, total assets or liquidity
             and similar financial responsibility covenants under contracts with
             customers or suppliers in the ordinary course of business;

                 (9)  any such encumbrance or restriction consisting of
             customary provisions in leases governing leasehold interests to the
             extent such provisions restrict the transfer of the lease or the
             property leased thereunder; and

                 (10) any restriction imposed by applicable law.

             SECTION 4.15. Limitation on Sale and Leaseback Transactions.

             Parent shall not, and shall not permit any Restricted Subsidiary
to, enter into any Sale and Leaseback Transaction; provided that Parent or any
Restricted Subsidiary may enter into a Sale and Leaseback Transaction if:

             (1) Parent or such Restricted Subsidiary could have

                 (x) incurred Indebtedness in an amount equal to the
             Attributable Debt relating to such Sale and Leaseback Transaction
             pursuant to Section 4.9, and

                 (y) incurred a Lien to secure such Indebtedness pursuant to
             Section 4.1l;

             (2) the gross cash proceeds of such Sale and Leaseback Transaction
         are at least equal to the Fair Market Value of the asset that is the
         subject of such Sale and Leaseback Transaction; and

             (3) the transfer of the asset in such Sale and Leaseback
         Transaction is permitted by, and Issuer applies the proceeds of such
         transaction in compliance with Section 4.13.



                                      -57-

         SECTION 4.16. Impairment of Security Interest. Parent shall not, and
shall not permit any Restricted Subsidiary to, take, or knowingly omit to take,
any action, which action or omission might or would have the result of
materially impairing the security interest in favor of the Trustee on behalf of
the Holders with respect to the Collateral, and neither Parent nor any
Restricted Subsidiary shall grant to any Person (other than the Trustee on
behalf of the Holders) any interest whatsoever in the Collateral (other than as
permitted by the Security Documents).

         No Pledgor shall file or record any instrument or document with any
entity, officer or office having responsibility for recording of Security
Interests which purports to terminate, vitiate or extinguish a Security Interest
in or Lien on Collateral.

         SECTION 4.17. Conduct of Business. Parent shall not, and shall not
permit any Restricted Subsidiary to, engage in any business other than the
Permitted Business.

         SECTION 4.18. Maintenance of Properties; Insurance; Compliance with
Law. (a) Subject to, and in compliance with, the provisions of Article Twelve
and the applicable Security Documents, the Company shall, and shall cause each
of its Restricted Subsidiaries to, at all times cause all material assets used
or useful in the conduct of their respective businesses to be maintained and
kept in reasonably satisfactory condition, repair and working order (reasonable
wear and tear excepted) and supplied with all necessary equipment, and shall
cause to be made all necessary repairs, renewals, replacements, betterments and
improvements thereto; provided, however, that nothing in this Section 4.18(a)
shall prevent the Company or any of its Restricted Subsidiaries from
discontinuing the operation and maintenance of any of such material assets if
such discontinuance is, in the reasonable judgment of the Company, desirable in
the conduct of the business of the Company and its Subsidiaries taken as a
whole.

         (b) The Company shall, and shall cause each of its Restricted
Subsidiaries to, at all times maintain insurance with respect to such of its
assets with responsible and reputable insurers, against such risks, casualties
and contingencies and in such types and amounts, and with such deductibles,
retentions and co-insurance provisions, as are consistent with sound business
practice for businesses owning similar assets in the same general area in which
the Company or such Restricted Subsidiary operates.

         (c) The Company shall, and shall cause each of its Restricted
Subsidiaries to, comply with all statutes, laws, ordinances or government rules
and regulations to which they are subject the non-compliance with which would,
individually or in the aggregate, materially adversely affect the business,
financial condition or results of operations of the Company and its Restricted
Subsidiaries taken as a whole.



                                      -58-

                                   ARTICLE 5

                                SUCCESSOR COMPANY

         SECTION 5.1. Merger, Consolidation and Sale of Assets.

         (a) Parent will not, in a single transaction or series of related
transactions, consolidate or merge with or into any Person, or transfer (or
cause or permit any Restricted Subsidiary of Parent to Transfer) all or
substantially all of Parent's assets (determined on a consolidated basis for
Parent and its Subsidiaries) whether as an entirety or substantially as an
entirety to any Person, unless

         (1) either

             (i)  Parent is the surviving or continuing corporation; or

             (ii) the Person (if other than Parent) formed by such consolidation
         or into which Parent is merged or the Transferee of such assets (the
         "Parent Surviving Entity"):

                  (x) is a corporation or limited liability company organized
             and validly existing under the laws of the United States or any
             State thereof or the District of Columbia; and

                  (y) expressly assumes, by supplemental indenture and Security
             Documents (in each case, in form and substance satisfactory to the
             Trustee) executed and delivered to the Trustee, all of the
             Obligations of Parent under its Guarantee and the performance of
             every covenant under Parent's Guarantee, this Indenture, the
             Registration Rights Agreement and the Security Documents on the
             part of Parent to be performed or observed; and

         (2) each of the conditions specified in Section 5.1(d) is satisfied.

For purposes of the foregoing, the Transfer in a single transaction or series of
related transactions of all or substantially all of the assets of one or more
Restricted Subsidiaries of Parent, the Capital Stock of which constitutes all or
substantially all of the assets of Parent (determined on a consolidated basis
for Parent and its Subsidiaries), shall be deemed to be the Transfer of all or
substantially all of the assets of Parent.

         Upon any consolidation or merger in which Parent is not the continuing
corporation, or any Transfer of all or substantially all of the assets of Parent
in accordance with the foregoing, the Parent Surviving Entity shall succeed to,
and be substituted for, and may exercise every right and power of, Parent under
its Guarantee, this Indenture, the Registration Rights Agreement and the
Security Documents with the same effect as if such Parent Surviving Entity had
been named as such.

         (b) Issuer shall not, in a single transaction or series of related
transactions, consolidate or merge with or into any Person, or Transfer (or
cause or permit any Restricted Subsidiary of



                                      -59-

Issuer to Transfer) all or substantially all of Issuer's assets (determined on a
consolidated basis for Issuer and its Subsidiaries) whether as an entirety or
substantially as an entirety to any Person, unless

         (1) either

             (i)  Issuer is the surviving or continuing corporation; or

             (ii) the Person (if other than Issuer) formed by such consolidation
         or into which Issuer is merged or the Transferee of such assets (the
         "Issuer Surviving Entity"):

                  (x) is a corporation or limited liability company organized
             and validly existing under the laws of the United States or any
             State thereof or the District of Columbia; and

                  (y) expressly assumes, by supplemental indenture and Security
             Documents (in each case, in form and substance satisfactory to the
             Trustee) executed and delivered to the Trustee, the due and
             punctual payment of the principal of and premium, if any, and
             interest on all of the Notes and the performance of every covenant
             under the Notes, this Indenture, the Registration Rights Agreement
             and the Security Documents on the part of Issuer to be performed or
             observed; and

         (2) each of the conditions specified in Section 5.1(d) is satisfied.

For purposes of the foregoing, the Transfer in a single transaction or series of
related transactions of all or substantially all of the assets of one or more
Restricted Subsidiaries of Issuer, the Capital Stock of which constitutes all or
substantially all of the assets of Issuer (determined on a consolidated basis
for Issuer and its Subsidiaries), shall be deemed to be the Transfer of all or
substantially all of the assets of Issuer

         Upon any consolidation or merger in which Issuer is not the continuing
corporation or any Transfer of all or substantially all of the assets of Issuer
in accordance with the foregoing, the Issuer Surviving Entity shall succeed to,
and be substituted for, and may exercise every right and power of, Issuer under
the Notes, this Indenture, the Registration Rights Agreement and the Security
Documents with the same effect as if such Issuer Surviving Entity had been named
as such.

         (c) No Guarantor (other than Parent) will, and Parent will not cause or
permit any such Guarantor to, consolidate with or merge with or into any Person
unless

         (1) either

             (i)  such Guarantor shall be the surviving or continuing
         corporation; or

             (ii) the Person (if other than such Guarantor) formed by such
         consolidation or into which such Guarantor is merged shall expressly
         assume, by supplemental indenture and Security Documents (in each case,
         in form and substance satisfactory to



                                      -60-

             the Trustee) executed and delivered to the Trustee, all of the
             obligations of such Guarantor under its Guarantee and the
             performance of every covenant under such Guarantor's Guarantee,
             this Indenture, the Registration Rights Agreement and the Security
             Documents on the part of such Guarantor to be performed or
             observed; and

             (2) each of the conditions specified in Section 5.1 (other than
         clause (1) thereof) is satisfied.

The requirements of this paragraph (c) shall not apply to (x) a consolidation or
merger of any Guarantor with and into Issuer or any other Guarantor, so long as
Issuer or a Guarantor survives such consolidation or merger, or (y) a Transfer
of any Guarantor that complies with Section 4.13.

             (d) The following additional conditions shall apply to each
transaction described in paragraph (a), (b) or (c), except that clause (1) below
shall not apply to a transaction described in paragraph (c):

             (1) immediately after giving effect to such transaction and the
         assumption contemplated above (including giving effect to any
         Indebtedness incurred or anticipated to be incurred in connection with
         or in respect of such transaction), Parent (or the Parent Surviving
         Entity, if applicable)

                 (x) could incur at least $1.00 of additional Indebtedness
             pursuant to the Coverage Ratio Exception; and

                 (y) has a Consolidated Net Worth not less than the Consolidated
             Net Worth of Parent immediately before the transaction;

             (2) immediately before and immediately after giving effect to such
         transaction and the assumption contemplated above (including giving
         effect to any Indebtedness incurred or anticipated to be incurred and
         any Lien granted in connection with or in respect of the transaction),
         no Default has occurred and is continuing;

             (3) Parent, Issuer, such Guarantor or the relevant surviving
         entity, as applicable, shall cause such amendments, supplements or
         other instruments to be filed, executed and/or recorded in such
         jurisdictions as may be required by applicable law to preserve and
         protect the Lien of the Security Documents on the Collateral owned by
         or Transferred to such Person, together with such financing statements
         as may be required to perfect any security interests in such Collateral
         which may be perfected by the filing of a financing statement under the
         UCC of the relevant states;

             (4) the Collateral owned by or Transferred to Parent, Issuer, such
         Guarantor or the relevant surviving entity, as applicable, shall

                 (i) continue to constitute Collateral under the Indenture and
             the Security Documents,



                                      -61-

                 (ii)  be subject to the Lien in favor of the Trustee for the
             benefit of the Holders, and

                 (iii) not be subject to any Lien other than Liens permitted by
             the Security Documents;

             (5) the assets of the Person which is merged or consolidated with
         or into the relevant surviving entity, to the extent that they are
         assets of the types which would constitute Collateral under the
         Security Documents, shall be treated as After Acquired Property and
         such surviving entity shall take such action as may be reasonably
         necessary to cause such assets to be made subject to the Lien of the
         Security Documents in the manner and to the extent required in this
         Indenture; and

             (6) Parent shall have delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel, each stating that such
         transaction and, if a supplemental indenture or supplemental Security
         Documents are required in connection with such transaction, such
         supplemental indenture and Security Documents comply with the
         applicable provisions of this Indenture, that all conditions precedent
         in this Indenture relating to such transaction have been satisfied and
         such supplemental indenture and Security Documents are enforceable.

             Opinions of Counsel required to be delivered under this Section or
elsewhere in this Indenture may have qualifications customary for opinions of
the type required, and counsel delivering such Opinions of Counsel may rely on
certificates of Terra Capital or government or other officials customary for
opinions of the type required, including certificates certifying as to matters
of fact.

             The successor entity pursuant to Section 5.1(a), (b) or (c) shall
be the successor to Parent, Issuer or the applicable Guarantor, as the case may
be, and shall succeed thereto and be substituted thereon, and may exercise every
right and power thereof under this Indenture, but the predecessor entity in the
case of a Transfer shall not be released from the obligation to pay the
principal of and interest on the Notes.

                                   ARTICLE 6

                              DEFAULTS AND REMEDIES

             SECTION 6.1. Events of Default. Any of the following shall
constitute an Event of Default:

             (i)   default for 30 days in the payment when due of interest on
         any Note;

             (ii)  default in the payment when due of principal on any Note,
         whether upon maturity, acceleration, optional redemption, required
         repurchase or otherwise;

             (iii) failure to perform or comply with Section 4.8;



                                      -62-

             (iv)   failure to perform or comply with any covenant, agreement,
         warranty or obligation in this Indenture or the Notes (other than any
         specified in clause (i), (ii) or (iii) above) which failure continues
         for 60 days after written notice thereof has been given to Terra
         Capital by the Trustee or to Terra Capital and the Trustee by the
         Holders of at least 25% in aggregate principal amount of the then
         outstanding Notes;

             (v)    default under any mortgage, indenture or instrument under
         which there may be issued or by which there may be secured or evidenced
         any Indebtedness for money borrowed by Parent or any Restricted
         Subsidiary, whether such Indebtedness now exists or is created after
         the Issue Date, which

                    (x) is caused by a failure to pay such Indebtedness at
             Stated Maturity (after giving effect to any grace period related
             thereto) (a "Payment Default"); or

                    (y) results in the acceleration of such Indebtedness prior
             to its Stated Maturity;

         and in each case, the principal amount of any such Indebtedness as to
         which a Payment Default or acceleration shall have occurred, together
         with the principal amount of any other such Indebtedness under which
         there has been a Payment Default or the maturity of which has been so
         accelerated, aggregates $15.0 million or more;

             (vi)   one or more final and non-appealable judgments, orders or
         decrees for the payment of money of $15.0 million or more, individually
         or in the aggregate, shall be entered against Parent or any Restricted
         Subsidiary or any of their respective properties and which final and
         non-appealable judgments, orders or decrees are not covered by third
         party indemnities or insurance as to which coverage has not been
         disclaimed and are not paid, discharged, bonded or stayed within 60
         days after their entry;

             (vii)  a court having jurisdiction in the premises enters (x) a
         decree or order for relief in respect of Issuer, Parent or any of its
         Significant Subsidiaries in an involuntary case or proceeding under any
         applicable federal or state bankruptcy, insolvency, reorganization or
         other similar law or (y) a decree or order adjudging Issuer, Parent or
         any of its Significant Subsidiaries a bankrupt or insolvent, or
         approving as properly filed a petition seeking reorganization,
         arrangement, adjustment or composition of or in respect of Issuer,
         Parent or any of its Significant Subsidiaries under any applicable
         federal or state law, or appointing a custodian, receiver, liquidator,
         assignee, trustee, sequestrator or other similar official of Issuer,
         Parent or any of its Significant Subsidiaries or of any substantial
         part of its property, or ordering the winding up or liquidation of its
         affairs, and the continuance of any such decree or order for relief or
         any such other decree or order unstayed and in effect for a period 60
         consecutive days;

             (viii) Terra Capital, Parent or any Significant Subsidiary:



                                      -63-

                  (A) commences a voluntary case or proceeding under any
             applicable federal or state bankruptcy, insolvency, reorganization
             or other similar law or any other case or proceeding to be
             adjudicated a bankrupt or insolvent; or

                  (B) consents to the entry of a decree or order for relief in
             respect of Issuer, Parent or any of its Significant Subsidiaries in
             an involuntary case or proceeding under any applicable federal or
             state bankruptcy, insolvency, reorganization or other similar law
             or to the commencement of any bankruptcy or insolvency case or
             proceeding against Issuer, Parent or any of its Significant
             Subsidiaries; or

                  (C) files a petition or answer or consent seeking
             reorganization or relief under any applicable federal or state law;
             or

                  (D) consents to the filing of such petition or to the
             appointment of or taking possession by a custodian, receiver,
             liquidator, assignee, trustee, sequestrator or similar official of
             Issuer, Parent or any of its Significant Subsidiaries or of any
             substantial part of its property; or

                  (E) makes an assignment for the benefit of creditors; or

                  (F) admits in writing its inability to pay its debts generally
             as they become due; or

                  (G) takes corporate action in furtherance of any such action;

             (ix) the Guarantee of Parent or any Guarantor that is a Significant
         Subsidiary ceases to be in full force and effect (other than in
         accordance with the terms of such Guarantee and this Indenture) or is
         declared null and void and unenforceable or is found invalid or Parent
         or any Guarantor denies or disaffirms its obligations under its
         Guarantee (other than by reason of release of a Guarantor from its
         Guarantee in accordance with the terms of this Indenture and the
         Guarantee); or

             (x)  default by Parent, Terra Capital or any Guarantor in the
         performance of any of the Security Documents which adversely affects
         the enforceability or the validity of the Trustee's Lien on the
         Collateral or which adversely affects the condition or value of the
         Collateral, taken as a whole, in any material respect, repudiation or
         disaffirmation by Parent, Issuer or any Guarantor of its obligations
         under any of the Security Documents or the determination in a judicial
         proceeding that any of the Security Documents is unenforceable or
         invalid against Parent, Terra Capital or any Guarantor for any reason.

             The term "Bankruptcy Law" means Title 11, United States Code, as
amended, or any similar federal or state law for the relief of debtors. The term
"Custodian" means any receiver, trustee, assignee, liquidator, custodian or
similar official under any Bankruptcy Law.

             Terra Capital shall deliver to the Trustee, within 30 days after
the occurrence thereof, written notice in the form of an Officers' Certificate
of any Event of Default under clause (v) of this



                                      -64-

Section 6.1 and any event which with the giving of notice or the lapse of time
would become an Event of Default under clause (iv) or (vi) of this Section 6.1,
its status and what action Terra Capital is taking or proposes to take with
respect thereto.

             SECTION 6.2. Acceleration. If an Event of Default occurs and is
continuing (other than an Event of Default described in clause (vii) or (viii)
of Section 6.1 with respect to Terra Capital, Issuer, Parent or any Guarantor
that is a Significant Subsidiary), the Trustee or the Holders of at least 25% in
principal amount of the outstanding Notes may declare the principal of and
accrued but unpaid interest on all the Notes to be due and payable. Upon such a
declaration, such principal and interest shall be due and payable immediately.
If an Event of Default described in clause (vii) or (viii) of Section 6.1 occurs
with respect to Issuer, Parent or any Guarantor that is a Significant
Subsidiary, the principal of and interest on all the Notes will ipso facto
become and be immediately due and payable without any declaration or other act
on the part of the Trustee or any Holders of the Notes. The Holders of a
majority in aggregate principal amount of the outstanding Notes by notice to the
Trustee may rescind an acceleration and its consequences if the rescission would
not conflict with any judgment or decree and if all existing Events of Default
have been cured or waived except nonpayment of principal or interest that has
become due solely because of acceleration. No such rescission shall affect any
subsequent Default or impair any right consequent thereto.

             SECTION 6.3. Other Remedies. If an Event of Default occurs and is
continuing, the Trustee may pursue any available remedy to collect the payment
of principal of or interest on the Notes or to enforce the performance of any
provision of the Notes or this Indenture.

             The Trustee may maintain a proceeding even if it does not possess
any of the Notes or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder in exercising any right or remedy accruing
upon an Event of Default shall not impair the right or remedy or constitute a
waiver of or acquiescence in the Event of Default. No remedy is exclusive of any
other remedy. All available remedies are, to the extent permitted by law,
cumulative.

             SECTION 6.4. Waiver of Past Defaults. The Holders of a majority in
aggregate principal amount of the Notes then outstanding by notice to the
Trustee may waive any past or existing Default and its consequences except (i) a
Default in the payment of the principal of or interest on a Note or (ii) a
Default in respect of a provision that under Section 9.2 cannot be amended
without the consent of each Holder affected. When a Default is waived, it is
deemed cured, and any Event of Default arising therefrom shall be deemed to have
been cured, but no such waiver shall extend to any subsequent or other Default
or impair any consequent right.

             SECTION 6.5. Control by Majority. The Holders of a majority in
principal amount of the outstanding Notes may direct the time, method and place
of conducting any proceeding for any remedy available to the Trustee or of
exercising any trust or power conferred on the Trustee. However, the Trustee may
refuse to follow any direction that conflicts with law or this Indenture or,
subject to Section 7.1, that the Trustee determines is unduly prejudicial to the
rights of any other Holder (it being understood that the Trustee shall have no
duty to make such determination) or that would involve the Trustee in personal
liability; provided, however, that the Trustee may take any other action deemed
proper by the Trustee that is not inconsistent with such direction. Prior to
taking any



                                      -65-

action hereunder, the Trustee shall be entitled to indemnification from the
Holders satisfactory to it in its sole discretion against all losses and
expenses caused by taking or not taking such action.

             SECTION 6.6. Limitation on Suits. A Holder may not pursue any
remedy with respect to this Indenture or the Notes unless:

             (1) such Holder has previously given the Trustee notice that an
         Event of Default is continuing;

             (2) Holders of at least 25% in principal amount of the outstanding
         Notes have requested the Trustee to pursue the remedy;

             (3) such Holders have offered the Trustee reasonable security or
         indemnity against any loss, liability or expense;

             (4) the Trustee has not complied with such request within 60 days
         after the receipt thereof and the offer of security or indemnity; and

             (5) the Holders of a majority in principal amount of the
         outstanding Notes have not given the Trustee a direction inconsistent
         with such request within such 60-day period.

             A Holder may not use this Indenture to prejudice the rights of
another Holder or to obtain a preference or priority over another Holder.

             SECTION 6.7. Rights of Holders To Receive Payment. Notwithstanding
any other provision of this Indenture, the right of any Holder to receive
payment of principal, premium (if any) or interest on the Notes held by such
Holder, on or after the respective due dates therefor, or to bring suit for the
enforcement of any such payment on or after such respective dates, shall not be
impaired or affected without the consent of such Holder.

             SECTION 6.8. Collection Suit by Trustee. If an Event of Default
specified in Section 6.1(i) or (ii) occurs and is continuing, the Trustee may
recover judgment in its own name and as trustee of an express trust against
Terra Capital for the whole amount then due and owing (together with interest on
any unpaid interest to the extent lawful) and the amounts provided for in
Section 7.7.

             SECTION 6.9. Trustee May File Proofs of Claim. The Trustee may file
such proofs of claim and other papers or documents as may be necessary or
advisable in order to have the claims of the Trustee and the Holders allowed in
any judicial proceedings relative to Issuer, its creditors or its property and,
unless prohibited by law or applicable regulations, may vote on behalf of the
Holders in any election of a trustee in bankruptcy or other Person performing
similar functions, and any Custodian in any such judicial proceeding is hereby
authorized by each Holder to make payments to the Trustee and, in the event that
the Trustee shall consent to the making of such payments directly to the
Holders, to pay to the Trustee any amount due it for the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and its counsel, and any other amounts due the Trustee under Section 7.7.



                                      -66-

          SECTION 6.10. Priorities. If the Trustee collects any money or
property pursuant to this Article 6, it shall pay out the money or property in
the following order, subject to applicable law:

          FIRST: to the Trustee for amounts due under Section 7.7;

          SECOND: to Holders for amounts due and unpaid on the Notes for
     principal and interest, ratably, without preference or priority of any
     kind, according to the amounts due and payable on the Notes for principal
     and interest, respectively; and

          THIRD: to Terra Capital.

          The Trustee may, upon prior written notice to Terra Capital, fix a
record date and payment date for any payment to Holders pursuant to this
Section. At least 15 days before such record date, Terra Capital shall mail to
each Holder and the Trustee a notice that states the record date, the payment
date and amount to be paid.

          SECTION 6.11. Undertaking for Costs. In any suit for the enforcement
of any right or remedy under this Indenture or in any suit against the Trustee
for any action taken or omitted by it as Trustee, a court in its discretion may
require the filing by any party litigant in the suit of an undertaking to pay
the costs of the suit, and the court in its discretion may assess reasonable
costs, including reasonable attorneys' fees and expenses, against any party
litigant in the suit, having due regard to the merits and good faith of the
claims or defenses made by the party litigant. This Section does not apply to a
suit by the Trustee, a suit by a Holder pursuant to Section 6.7 or a suit by
Holders of more than 10% in aggregate principal amount of the outstanding Notes.

                                    ARTICLE 7

                                     TRUSTEE

          SECTION 7.1. Duties of Trustee.

          (a) If an Event of Default has occurred and is continuing, the Trustee
shall exercise the rights and powers vested in it by this Indenture and the
Security Documents and use the same degree of care and skill in their exercise
as a prudent Person would exercise or use under the circumstances in the conduct
of such Person's own affairs.

          (b) Except during the continuance of an Event of Default:

          (1) the Trustee undertakes to perform such duties and only such duties
     as are specifically set forth in this Indenture and the Security Documents
     and no implied covenants or obligations shall be read into this Indenture
     or the Security Documents against the Trustee; and

          (2) in the absence of bad faith on its part, the Trustee may
     conclusively rely, as to the truth of the statements and the correctness of
     the opinions expressed therein, upon certifi-



                                      -67-

     cates or opinions furnished to the Trustee and conforming to the
     requirements of this Indenture. However, in the case of any such
     certificates or opinions which by any provision hereof are specifically
     required to be furnished to the Trustee, the Trustee shall examine the
     certificates and opinions to determine whether or not they conform to the
     requirements of this Indenture.

          (c) The Trustee may not be relieved from liability for its own
negligent action, its own negligent failure to act or its own willful
misconduct, except that:

          (1) this paragraph does not limit the effect of paragraph (b) of this
     Section;

          (2) the Trustee shall not be liable for any error of judgment made in
     good faith by a Trust Officer unless it is proved that the Trustee was
     negligent in ascertaining the pertinent facts; and

          (3) the Trustee shall not be liable with respect to any action it
     takes or omits to take in good faith in accordance with a direction
     received by it pursuant to Sections 6.2 and 6.5.

          (d) Every provision of this Indenture relating to the conduct or
affecting the liability of or affording protection to the Trustee shall be
subject to the provisions of this Section and to the provisions of the TIA.

          SECTION 7.2. Rights of Trustee. Subject to Section 7.1,

          (a) The Trustee may rely and shall be protected in acting or
     refraining from acting upon any resolution, Officers' Certificate,
     certificate, statement, instrument, opinion, report, notice, request,
     direction, consent, order, bond, debenture, note, other evidence of
     indebtedness or other paper or document believed by it to be genuine and to
     have been signed or presented by the proper party or parties.

          (b) Whenever in the administration of this Indenture the Trustee shall
     deem it desirable that a matter be proved or established prior to taking,
     suffering or omitting any action hereunder, the Trustee (unless other
     evidence be herein specifically prescribed) may, in the absence of bad
     faith on its part, rely upon an Officers' Certificate.

          (c) Before the Trustee acts or refrains from acting, the Trustee may
     consult with counsel, and the written advice of such counsel or any Opinion
     of Counsel shall be full and complete authorization and protection in
     respect of any action taken, suffered or omitted by it hereunder in good
     faith and in reliance thereon.

          (d) The Trustee shall be under no obligation to exercise any of the
     rights or powers vested in it by this Indenture at the request or direction
     of any of the Holders pursuant to this Indenture, unless such Holders shall
     have offered to the Trustee reasonable security or indemnity reasonably
     acceptable to the Trustee against the costs, expenses and liabilities which
     might be incurred by it in compliance with such request or direction.



                                      -68-

          (e) Prior to the occurrence of an Event of Default hereunder and after
     the cure or waiver of all Events of Default, the Trustee shall not be bound
     to make any investigation into the facts or matters stated in any
     resolution, Officers' Certificate, or other request, consent, order,
     approval, appraisal, bond, debenture, note, coupon, security or other paper
     or document unless requested in writing to do so by the Holders of not less
     than a majority in aggregate principal amount of the Notes then
     outstanding; provided that, if the payment within a reasonable time to the
     Trustee of the costs, expenses or liabilities likely to be incurred by it
     in the making of such investigations, in the opinion of the Trustee, is not
     reasonably assured to the Trustee by the security afforded to it by the
     terms of this Indenture, the Trustee may require reasonable indemnity
     against such expenses or liabilities as a condition to proceeding; the
     reasonable expenses of every such examination shall be paid by Terra
     Capital or, if advanced by the Trustee, shall be repaid by Terra Capital on
     demand.

          (f) The Trustee may execute any of the trusts or powers hereunder or
     perform any duties hereunder either directly or by or through agents or
     attorneys and the Trustee shall not be responsible for any misconduct or
     negligence on the part of any agent or attorney appointed with due care by
     it hereunder.

          (g) Whenever in the administration of this Indenture the Trustee shall
     deem it desirable that a matter be proved or established prior to taking,
     suffering or omitting any action hereunder, or where information is
     required or necessary to be furnished by Terra Capital in order for the
     Trustee to act, the Trustee (unless otherwise evidence by herein
     specifically prescribed), shall not be liable for any action it takes or
     omits to take in good faith in reliance upon an Officers' Certificate, or
     for any action taken or omitted to be taken by it in good faith and
     believed by it to be authorized or within the discretion, rights or powers
     conferred upon it by this Indenture.

          (h) The Trustee shall not be bound to ascertain or inquire as to the
     performance or observance of any covenants, conditions or agreements on the
     part of Terra Capital, except as otherwise specifically set forth in this
     Indenture, but the Trustee may require of Terra Capital full information
     and advice as to the performance of the covenants, conditions and
     agreements contained herein.

          (i) Except for (i) a default under Section 6.1(i) or 6.1(ii), (ii) the
     failure of Parent or Terra Capital to file any financial statements,
     documents or certificates specifically required to be filed with the
     Trustee pursuant to the provisions of this Indenture or (iii) any other
     event of which the Trustee has "actual knowledge" and which event
     constitutes a Default under this Indenture, the Trustee shall not be deemed
     to have notice of any default or event unless specifically notified in
     writing by Terra Capital or the Holders of not less than 25% in aggregate
     principal amount of the Notes then outstanding; as used herein, the term
     "actual knowledge" means the actual fact of knowing, without a duty to make
     any investigation with regard thereto.

          (j) The Trustee shall not be required to give any note, bond or surety
     in respect of the execution of the trusts and powers under this Indenture.



                                      -69-

          (k) The permissive rights of the Trustee to perform acts enumerated in
     this Indenture shall not be construed as a duty.

          (l) The Trustee shall not be liable for any interest on any money
     received by it except as the Trustee may agree in writing with Terra
     Capital.

          (m) Money held in trust by the Trustee need not be segregated from
     other funds except to the extent required by law.

          SECTION 7.3. Individual Rights of Trustee. The Trustee in its
individual or any other capacity may become the owner or pledgee of Notes and
may otherwise deal with Parent or its respective Affiliates with the same rights
it would have if it were not Trustee. Any Paying Agent, Registrar, co-registrar
or co-paying agent may do the same with like rights. However, the Trustee must
comply with Sections 7.10 and 7.11.

          SECTION 7.4. Trustee's Disclaimer. The Trustee shall not be
responsible for and makes no representation as to the validity or adequacy of
this Indenture or the Notes, it shall not be accountable for Terra Capital's use
of the proceeds from the Notes, and it shall not be responsible for any
statement of Terra Capital in this Indenture or in any document issued in
connection with the sale of the Notes or in the Notes other than the Trustee's
certificate of authentication.

          SECTION 7.5. Notice of Defaults. If a Default occurs and is continuing
and if it is known to a Responsible Officer of the Trustee, the Trustee shall
mail to each Holder notice of the Default within 90 days after it occurs. Except
in the case of a Default in payment of principal of or interest on any Note
(including payments pursuant to the mandatory redemption provisions of such
Note, if any), the Trustee may withhold the notice if and so long as a committee
of its Trust Officers in good faith determines that withholding the notice is in
the interests of Holders.

          SECTION 7.6. Reports by Trustee to Holders. As promptly as practicable
after each January 1 beginning with the January 1 following the date of this
Indenture, and in any event prior to July 15 in each year, the Trustee shall
mail to each Holder a brief report dated as of May 15 that complies with TIA (S)
313(a). The Trustee also shall comply with TIA (S) 313(b). Prior to delivery to
the Holders, the Trustee shall deliver to Terra Capital a copy of any report it
delivers to Holders pursuant to this Section 7.6.

          SECTION 7.7. Compensation and Indemnity. Terra Capital shall pay to
the Trustee from time to time such reasonable compensation for its services as
Terra Capital and the Trustee shall from time to time agree in writing. The
Trustee's compensation shall not be limited by any law on compensation of a
trustee of an express trust. Terra Capital shall reimburse the Trustee upon
request for all reasonable out-of-pocket expenses incurred or made by it,
including costs of collection, in addition to such compensation for its
services, except any such expense, disbursement or advance as may arise from its
negligence, willful misconduct or bad faith. Such expenses shall include the
reasonable compensation and expenses, disbursements and advances of the
Trustee's agents, counsel, accountants and experts. The Trustee shall provide
Terra Capital reasonable notice of any expenditure not in the ordinary course of
business. Terra Capital shall indemnify each of the Trustee and any predecessor
Trustees against any and all loss, damage, claim, liability or expense
(including attorneys'



                                      -70-

fees and expenses) (other than taxes applicable to the Trustee's compensation
hereunder) incurred by it in connection with the acceptance or administration of
this trust and the performance of its duties hereunder. The Trustee shall notify
Terra Capital promptly of any claim for which it may seek indemnity. Failure by
the Trustee to so notify Terra Capital shall not relieve Terra Capital of its
obligations hereunder. Terra Capital shall defend the claim and the Trustee
shall cooperate in the defense of such claim. The Trustee may have separate
counsel at its own expense. If, however, representation in any defense by Terra
Capital and its counsel would in the opinion of counsel to the Trustee create a
conflict of interest, Terra Capital shall pay the expense of separate counsel to
the Trustee. Terra Capital need not reimburse any expense or indemnify against
any loss, liability or expense incurred by the Trustee through the Trustee's own
willful misconduct, negligence or bad faith. Terra Capital need not pay for any
settlement made without its written consent.

          To secure Terra Capital's payment obligations in this Section, the
Trustee shall have a lien prior to the Notes on all money or property held or
collected by the Trustee other than money or property held in trust to pay
principal of and interest on particular Notes.

          Terra Capital's payment obligations pursuant to this Section shall
survive the discharge of this Indenture and the resignation or removal of the
Trustee. When the Trustee incurs expenses after the occurrence of an Event of
Default specified in Section 6.1(vii) or (viii) with respect to Terra Capital,
the expenses are intended to constitute expenses of administration under the
Bankruptcy Law.

          SECTION 7.8. Replacement of Trustee. The Trustee may resign at any
time upon 30 days notice to Terra Capital. The Holders of a majority in
principal amount of the outstanding Notes may remove the Trustee by so notifying
the Trustee and may appoint a successor Trustee. Terra Capital shall remove the
Trustee if:

          (1)  the Trustee fails to comply with Section 7.10;

          (2)  the Trustee is adjudged bankrupt or insolvent;

          (3)  a receiver or other public officer takes charge of the Trustee or
     its property; or

          (4)  the Trustee otherwise becomes incapable of acting.

          If the Trustee resigns, or is removed by Terra Capital or by the
Holders of a majority in principal amount of the outstanding Notes and such
Holders do not reasonably promptly appoint a successor Trustee, or if a vacancy
exists in the office of Trustee for any reason (the Trustee in such event being
referred to herein as the retiring Trustee), Terra Capital shall promptly
appoint a successor Trustee.

          A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to Terra Capital. Thereupon the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture. The successor Trustee shall mail a notice of its
succession to Holders. The retir-



                                      -71-

ing Trustee shall promptly transfer all property held by it as Trustee to the
successor Trustee, subject to the lien provided for in Section 7.7.

          If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee or the Holders of
10% in principal amount of the outstanding Notes may petition any court of
competent jurisdiction for the appointment of a successor Trustee.

          If the Trustee fails to comply with Section 7.10, any Holder may
petition any court of competent jurisdiction for the removal of the Trustee and
the appointment of a successor Trustee.

          Notwithstanding the replacement of the Trustee pursuant to this
Section, Terra Capital's obligations under Section 7.7 shall continue for the
benefit of the retiring Trustee.

          SECTION 7.9. Successor Trustee by Merger. If the Trustee consolidates
with, merges or converts into, or transfers all or substantially all its
corporate trust business or assets to, another corporation or banking
association, the resulting, surviving or transferee corporation without any
further act shall be the successor Trustee, so long as such corporation is
eligible under this Article 7 and TIA (S) 310(a).

          In case at the time such successor or successors by merger, conversion
or consolidation to the Trustee shall succeed to the trusts created by this
Indenture any of the Notes shall have been authenticated but not delivered, any
such successor to the Trustee may adopt the certificate of authentication of any
predecessor trustee, and deliver such Notes so authenticated; and in case at
that time any of the Notes shall not have been authenticated, any successor to
the Trustee may authenticate such Notes either in the name of any predecessor
hereunder or in the name of the successor to the Trustee; and in all such cases
such certificates shall have the full force which it is anywhere in the Notes or
in this Indenture provided that the certificate of the Trustee shall have.

          SECTION 7.10. Eligibility; Disqualification. The Trustee shall at all
times satisfy the requirements of TIA (S) 310(a). The Trustee shall have a
combined capital and surplus of at least $50,000,000 as set forth in its most
recent published annual report of condition. The Trustee shall comply with TIA
(S) 310(b); provided, however, that there shall be excluded from the operation
of TIA (S) 310(b)(1) any indenture or indentures under which other securities or
certificates of interest or participation in other securities of Terra Capital
are outstanding if the requirements for such exclusion set forth in TIA (S)
310(b)(1) are met.

          SECTION 7.11. Preferential Collection of Claims Against Terra Capital.
The Trustee shall comply with TIA (S) 311(a), excluding any creditor
relationship listed in TIA (S) 311(b). A Trustee who has resigned or been
removed shall be subject to TIA (S) 311(a) to the extent indicated.



                                      -72-

                                   ARTICLE 8

                       DISCHARGE OF INDENTURE; DEFEASANCE

          SECTION 8.1. Discharge of Liability on Notes; Defeasance.

          (a) When (i) Terra Capital delivers to the Trustee all outstanding
Notes (other than Notes replaced pursuant to Section 2.7) for cancellation or
(ii) all outstanding Notes have become due and payable, whether at maturity or
as a result of the mailing of a notice of redemption pursuant to Article 3, and
Terra Capital irrevocably deposits with the Trustee funds sufficient to pay at
maturity or upon redemption all outstanding Notes, including interest thereon,
and if in either case Terra Capital pays all other sums payable hereunder by
Terra Capital, then this Indenture shall, subject to Section 8.1(c), cease to be
of further effect. The Trustee shall acknowledge satisfaction and discharge of
this Indenture on demand of Terra Capital accompanied by an Officers'
Certificate and an Opinion of Counsel that all conditions precedent provided for
herein relating to satisfaction and discharge of this Indenture have been
complied with and at the cost and expense of Terra Capital.

          (b) Subject to Sections 8.1(c) and 8.2, Terra Capital at any time may
terminate (i) all its obligations under the Notes and this Indenture ("legal
defeasance option") or (ii) its obligations under Sections 4.4 through 4.19,
inclusive, and the operation of Sections 6.1(iv), 6.1(v), 6.1(vi), 6.1(vii) (but
only with respect to Significant Subsidiaries), 6.1(viii) (but only with respect
to Significant Subsidiaries), 6.1(ix) and 5.1(d)(1) and 5.1(d)(2) ("covenant
defeasance option"). Terra Capital may exercise its legal defeasance option
notwithstanding its prior exercise of its covenant defeasance option.

          If Terra Capital exercises its legal defeasance option, payment of the
Notes may not be accelerated because of an Event of Default. If Terra Capital
exercises its covenant defeasance option, payment of the Notes may not be
accelerated due to a failure to comply with any of Sections 4.4 through 4.19,
inclusive, or the operation of Section 6.1(iv), 6.1(v), 6.1(vi), 6.1(vii) (but
only with respect to Significant Subsidiaries), 6.1(viii) (but only with respect
to Significant Subsidiaries) or 6.1(ix). If Terra Capital exercises its legal
defeasance option or its covenant defeasance option, each Guarantor will be
released from all of its obligations under Article 10.

          Upon satisfaction of the conditions set forth herein and upon request
of Terra Capital, the Trustee shall acknowledge in writing the discharge of
those obligations that Terra Capital terminates.

          (c) Notwithstanding clauses (a) and (b) above, Terra Capital's
obligations in Sections 2.3, 2.4, 2.5, 2.6, 2.7, 7.7, 7.8, 8.3, 8.4, 8.5 and 8.6
shall survive until the Notes have been paid in full. Thereafter, Terra
Capital's obligations in Sections 7.7, 8.4 and 8.5 shall survive.

          SECTION 8.2. Conditions to Defeasance. Terra Capital may exercise its
legal defeasance option or its covenant defeasance option only if:

          (1) Terra Capital irrevocably deposits in trust (the "defeasance
     trust") with the Trustee money or U.S. Government Obligations which through
     the scheduled payment of



                                      -73-

     principal and interest in respect thereof in accordance with their terms
     will provide cash (without reinvestment) at such times and in such amounts
     as will be sufficient to pay principal and interest on the Notes (except
     Notes replaced pursuant to Section 2.7) to redemption or maturity, as the
     case may be;

          (2) Terra Capital delivers to the Trustee a certificate from a
     nationally recognized firm of independent accountants expressing their
     opinion that the payments of principal and interest when due and without
     reinvestment on the deposited U.S. Government Obligations plus any
     deposited money without investment will provide cash at such times and in
     such amounts as will be sufficient to pay principal and interest when due
     on all outstanding Notes (except Notes replaced pursuant to Section 2.7) to
     maturity or redemption, as the case may be;

          (3) 91 days pass after the deposit is made and during the 91-day
     period no Default specified in Section 6.1(vi) or (vii) with respect to
     Terra Capital occurs which is continuing at the end of the period;

          (4) no default exists under any Indebtedness of Parent or any
     Restricted Subsidiary;

          (5) Terra Capital delivers to the Trustee an Opinion of Counsel to the
     effect that the trust resulting from the deposit does not constitute, or is
     qualified as, a regulated investment company under the Investment Company
     Act of 1940;

          (6) Terra Capital shall have delivered to the Trustee an Opinion of
     Counsel stating that the Holders will not recognize income, gain or loss
     for Federal income tax purposes as a result of such deposit and defeasance
     and will be subject to Federal income tax on the same amounts and in the
     same manner and at the same times as would have been the case if such
     deposit and defeasance had not occurred (and, in the case of legal
     defeasance only, such Opinion of Counsel must be based on a ruling of the
     Internal Revenue Service or change in applicable Federal income tax law);

          (7) Terra Capital delivers to the Trustee an Officers' Certificate and
     an Opinion of Counsel, each stating that all conditions precedent to the
     defeasance and discharge of the Notes as contemplated by this Article 8
     have been complied with; and

          (8) Terra Capital shall have paid or duly provided for payment under
     terms mutually satisfactory to Terra Capital and the Trustee all amounts
     then due to the Trustee pursuant to Section 7.7.

          Opinions of Counsel required to be delivered under this Section may
have qualifications customary for opinions of the type required and counsel
delivering such Opinions of Counsel may rely on certificates of Terra Capital or
government or other officials customary for opinions of the type required,
including certificates certifying as to matters of fact.

          Before or after a deposit, Terra Capital may make arrangements
satisfactory to the Trustee for the redemption of Notes at a future date in
accordance with Article 3.



                                      -74-

          SECTION 8.3. Application of Trust Money. The Trustee shall hold in
trust money or U.S. Government Obligations deposited with it pursuant to this
Article 8. It shall apply the deposited money and the money from U.S. Government
Obligations either directly or through the Paying Agent (including Terra Capital
acting as its own Paying Agent as the Trustee may determine) and in accordance
with this Indenture to the payment of principal of and interest on the Notes.

          SECTION 8.4. Repayment to Terra Capital. The Trustee and the Paying
Agent shall notify Terra Capital of any excess money or securities held by them
at any time and shall promptly turn over to Terra Capital upon request any
excess money or securities held by them at any time.

          Subject to any applicable abandoned property law, the Trustee and the
Paying Agent shall pay to Terra Capital upon written request any money held by
them for the payment of principal or interest that remains unclaimed for two
years, and, thereafter, Holders entitled to the money must look to Terra Capital
for payment as general creditors.

          SECTION 8.5. Indemnity for Government Obligations. Terra Capital shall
pay and shall indemnify the Trustee against any tax, fee or other charge imposed
on or assessed against deposited U.S. Government Obligations or the principal
and interest received on such U.S. Government Obligations other than any such
tax, fee or other charge which by law is for the account of the Holders of the
defeased Notes; provided that the Trustee shall be entitled to charge any such
tax, fee or other charge to such Holders' account.

          SECTION 8.6. Reinstatement. If the Trustee or Paying Agent is unable
to apply any money or U.S. Government Obligations in accordance with this
Article 8 by reason of any legal proceeding or by reason of any order or
judgment of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application, Terra Capital's obligations under this
Indenture and the Notes and the Guarantors' obligations under this Indenture and
the Guarantees shall be revived and reinstated as though no deposit had occurred
pursuant to this Article 8 until such time as the Trustee or Paying Agent is
permitted to apply all such money or U.S. Government Obligations in accordance
with this Article 8; provided, however, that (a) if Terra Capital has made any
payment of interest on or principal of any Notes following the reinstatement of
its obligations, Terra Capital shall be subrogated to the rights of the Holders
of such Notes to receive such payment from the money or U.S. Government
Obligations held by the Trustee or Paying Agent and (b) unless otherwise
required by any legal proceeding or any order or judgment of any court or
governmental authority, the Trustee or Paying Agent shall return all such money
and U.S. Government Obligations to Terra Capital promptly after receiving a
written request therefor at any time, if such reinstatement of Terra Capital's
obligations has occurred and continues to be in effect.

                                   ARTICLE 9

                             AMENDMENTS AND WAIVERS

          SECTION 9.1. Without Consent of Holders. Terra Capital and the Trustee
may amend this Indenture or the Notes without notice to or consent of any
Holder:



                                      -75-

          (1)  to cure any ambiguity, defect or inconsistency;

          (2)  to provide for the assumption by a successor Person of the
     obligations of Parent, Issuer or any Guarantor under this Indenture in
     accordance with Article 5;

          (3)  to provide for uncertificated Notes in addition to or in place of
     certificated Notes (provided that the uncertificated Notes are issued in
     registered form for purposes of Section 163(f) of the Code, or in a manner
     such that the uncertificated Notes are described in Section 163(f)(2)(B) of
     the Code);

          (4)  to add a Guarantor;

          (5)  to release Parent or a Guarantor from its Guarantee and the
     Security Documents when permitted by this Indenture;

          (6)  to add any additional asset as Collateral;

          (7)  to release Collateral from the Lien of this Indenture and the
     Security Documents when permitted or required by this Indenture;

          (8)  to add to the covenants of Parent or Terra Capital for the
     benefit of the Holders or to surrender any right or power herein conferred
     upon Parent or Terra Capital;

          (9)  to comply with any requirement of the SEC in connection with the
     qualification of this Indenture under the TIA; or

          (10) to make any other change that does not materially adversely
     affect the rights of any Holder.

          The consent of the Holders is not necessary under this Indenture to
approve the particular form of any proposed amendment or waiver. It is
sufficient if such consent approves the substance of the proposed amendment or
waiver.

          After an amendment or waiver under this Section becomes effective,
Terra Capital is required to mail to Holders a notice briefly describing such
amendment or waiver. However, the failure to give such notice to all Holders, or
any defect therein, shall not impair or affect the validity of the amendment
under this Section.

          SECTION 9.2. With Consent of Holders. Terra Capital and the Trustee
may amend this Indenture, the Notes and the Security Documents with the consent
of the Holders of a majority of the aggregate principal amount of the Notes then
outstanding (including consents obtained in connection with a tender offer or
exchange for the Notes) and any past default or compliance with any provision
may also be waived with the consent of the Holders of a majority in principal
amount of the Notes then outstanding. However, without the consent of each
Holder of outstanding Notes affected thereby, no amendment may:

          (1)  reduce the principal amount of or change the fixed maturity of
     any Note;



                                      -76-

          (2)  alter the provisions with respect to redemption or repurchase
     provisions of any Note or this Indenture in a manner adverse to the Holders
     of the Notes (other than the provisions of this Indenture relating to any
     offer to purchase required under Section 4.8);

          (3)  waive a redemption or purchase payment due with respect to any
     Note;

          (4)  reduce the rate of or change the time for payment of interest on
     any Note;

          (5)  waive a Default in the payment of principal or interest on the
     Notes (except that Holders of at least a majority in aggregate principal
     amount of the then outstanding Notes may (x) rescind an acceleration of the
     Notes that resulted from a nonpayment default and (y) waive the payment
     default that resulted from such acceleration);

          (6)  make the principal of or interest on any Note payable in money
     other than United States Dollars;

          (7)  make any change in the provisions of this Indenture relating to
     waivers of past Defaults or the rights of Holders of Notes to receive
     payments of principal of or interest on the Notes;

          (8)  release from the Lien of this Indenture and the Security
     Documents all or substantially all of the Collateral except in accordance
     with the terms of this Indenture and the Security Documents;

          (9)  make the Notes or any Guarantee subordinated by their or its
     terms in right of payment to any other Indebtedness;

          (10) release Parent or any Guarantor that is a Significant Subsidiary
     from its Guarantee except in compliance with this Indenture; or

          (11) make any change in the amendment and waiver provisions of this
     Indenture;

provided further that no such modification or amendment or waiver may, without
the consent of the Holders of two-thirds of the aggregate principal amount of
Notes then outstanding, amend or waive any of the provisions (including the
definitions therein) in Section 4.8 in a manner materially adverse to the
Holders.

          It shall not be necessary for the consent of the Holders under this
Section to approve the particular form of any proposed amendment or waiver. It
is sufficient if such consent approves the substance of the proposed amendment
or waiver.

          After an amendment or waiver under this Section becomes effective,
Terra Capital shall mail to Holders a notice briefly describing such amendment
or waiver. The failure to give such notice to all Holders, or any defect
therein, shall not impair or affect the validity of an amendment or waiver.



                                      -77-

          SECTION 9.3. Compliance with Trust Indenture Act. Every amendment to
this Indenture or the Notes shall comply with the TIA as then in effect.

          SECTION 9.4. Revocation and Effect of Consents and Waivers. A consent
to an amendment or a waiver by a Holder of a Note shall bind the Holder and
every subsequent Holder of that Note or portion of the Note that evidences the
same debt as the consenting Holder's Note, even if notation of the consent or
waiver is not made on the Note. An amendment or waiver becomes effective once
the requisite number of consents are received by Terra Capital or the Trustee.
After an amendment or waiver becomes effective, it shall bind every Holder.

          Terra Capital may, but shall not be obligated to, fix a record date
for the purpose of determining the Holders entitled to give their consent or
take any other action described above or required or permitted to be taken
pursuant to this Indenture. If a record date is fixed, then notwithstanding the
immediately preceding paragraph, those Persons who were Holders at such record
date (or their duly designated proxies), and only those Persons, shall be
entitled to give such consent or to revoke any consent previously given or to
take any such action, whether or not such Persons continue to be Holders after
such record date. No such consent shall be valid or effective for more than 120
days after such record date.

          SECTION 9.5. Notation on or Exchange of Notes. If an amendment changes
the terms of a Note, the Trustee may require the Holder of the Note to deliver
it to the Trustee. The Trustee may place an appropriate notation on the Note
regarding the changed terms and return it to the Holder.

          Alternatively, if Terra Capital or the Trustee so determines, Terra
Capital in exchange for the Note shall issue and the Trustee shall authenticate
a new Note that reflects the changed terms. Failure to make the appropriate
notation or to issue a new Note shall not affect the validity of such amendment.

          SECTION 9.6. Trustee To Sign Amendments. The Trustee shall sign any
amendment authorized pursuant to this Article 9 (other than Section 9.1(4)) if
the amendment does not adversely affect the rights, duties, liabilities or
immunities of the Trustee. If it does, the Trustee may but need not sign it. In
signing such amendment the Trustee shall be entitled to receive indemnity
reasonably satisfactory to it and to receive, and (subject to Section 7.1) shall
be fully protected in relying upon, an Officers' Certificate and an Opinion of
Counsel stating that such amendment complies with the provisions of this Article
9.

                                   ARTICLE 10

                                   GUARANTEES

          SECTION 10.1. Guarantees. Each Guarantor hereby unconditionally and
irrevocably guarantees, jointly and severally, to each Holder and to the Trustee
and its successors and assigns as primary obligor and not merely as a surety, on
a senior secured basis, the performance and punctual payment when due, whether
at Stated Maturity, by acceleration or otherwise, of all obligations of Terra
Capital under this Indenture and the Notes whether for payment of principal of
or inter-



                                      -78-

est on the Notes, expenses, indemnification or otherwise (all such obligations
guaranteed by the Guarantors being herein called the "Guaranteed Obligations").
The Guarantors will agree to pay, in addition to the amount stated above, any
and all expenses (including reasonable counsel fees and expenses) incurred by
the Trustee or the Holders in enforcing any rights under the Guarantees. Each
Guarantor further agrees that the Guaranteed Obligations may be extended or
renewed, in whole or in part, without notice or further assent from such
Guarantor and that such Guarantor will remain bound under this Article 10
notwithstanding any extension or renewal of any Guaranteed Obligation.

          Each Guarantor waives presentation to, demand of, payment from and
protest to Terra Capital of any of the Guaranteed Obligations and also waives
notice of protest for nonpayment. Each Guarantor waives notice of any default
under the Notes or the Guaranteed Obligations. The obligations of each Guarantor
hereunder shall not be affected by (a) the failure of any Holder or the Trustee
to assert any claim or demand or to enforce any right or remedy against Terra
Capital or any other Person under this Indenture, the Notes or any other
agreement or otherwise; (b) any extension or renewal of any thereof; (c) any
rescission, waiver, amendment or modification of any of the terms or provisions
of this Indenture, the Notes or any other agreement; (d) the release of any
security held by any Holder or the Trustee for the Guaranteed Obligations or any
of them; (e) the failure of any Holder or the Trustee to exercise any right or
remedy against any other guarantor of the Guaranteed Obligations; or (f) any
change in the ownership of such Guarantor.

          Each Guarantor further agrees that its Guarantee herein constitutes a
guarantee of payment, performance and compliance when due (and not a guarantee
of collection) and waives any right to require that any resort be had by any
Holder or the Trustee to any security held for payment of the Guaranteed
Obligations.

          Except as expressly set forth in Sections 8.2, 10.2 and 10.6, the
obligations of each Guarantor hereunder shall not be subject to any reduction,
limitation, impairment or termination for any reason, including any claim of
waiver, release, surrender, alteration or compromise, and shall not be subject
to any defense of setoff, counterclaim, recoupment or termination whatsoever or
by reason of the invalidity, illegality or unenforceability of the Guaranteed
Obligations or otherwise. Without limiting the generality of the foregoing, the
obligations of each Guarantor herein shall not be discharged or impaired or
otherwise affected by the failure of any Holder or the Trustee to assert any
claim or demand or to enforce any remedy under this Indenture, the Notes or any
other agreement, by any waiver or modification of any thereof, by any default,
failure or delay, willful or otherwise, in the performance of the Guaranteed
Obligations, or by any other act or thing or omission or delay to do any other
act or thing which may or might in any manner or to any extent vary the risk of
such Guarantor or would otherwise operate as a discharge of such Guarantor as a
matter of law or equity.

          Each Guarantor further agrees that its Guarantee herein shall continue
to be effective or be reinstated, as the case may be, if at any time payment, or
any part thereof, of any Guaranteed Obligation is rescinded or must otherwise be
restored by any Holder or the Trustee upon the bankruptcy or reorganization of
Terra Capital or otherwise.

          In furtherance of the foregoing and not in limitation of any other
right which any Holder or the Trustee has at law or in equity against any
Guarantor by virtue hereof, upon the failure of Terra Capital to pay any
Guaranteed Obligation when and as the same shall become due, whether at



                                      -79-

maturity, by acceleration, by redemption or otherwise, or to perform or comply
with any Guaranteed Obligation, each Guarantor hereby promises to and will, upon
receipt of written demand by the Trustee, forthwith pay, or cause to be paid, in
cash, to the Holders or the Trustee an amount equal to the sum of (i) the unpaid
amount of such Guaranteed Obligations, (ii) accrued and unpaid interest on such
Guaranteed Obligations (but only to the extent not prohibited by law) and (iii)
all other monetary Guaranteed Obligations of Terra Capital to the Holders and
the Trustee.

          Each Guarantor agrees that it shall not be entitled to any right of
subrogation in respect of any Guaranteed Obligations guaranteed hereby until
payment in full of all Guaranteed Obligations. Each Guarantor further agrees
that, as between it, on the one hand, and the Holders and the Trustee, on the
other hand, (x) the maturity of the Guaranteed Obligations hereby may be
accelerated as provided in Article 6 for the purposes of such Guarantor's
Guarantee herein, notwithstanding any stay, injunction or other prohibition
preventing such acceleration in respect of the Guaranteed Obligations, and (y)
in the event of any declaration of acceleration of Guaranteed Obligations as
provided in Article 6, the Obligations (whether or not due and payable) shall
forthwith become due and payable by such Guarantor for the purposes of this
Section.

          Each Guarantor also agrees to pay any and all costs and expenses
(including reasonable attorneys' fees) incurred by the Trustee or any Holder in
enforcing any rights under this Section.

          SECTION 10.2. Limitation on Liability. Any term or provision of this
Indenture to the contrary notwithstanding, the maximum aggregate amount of the
obligations guaranteed hereunder by any Guarantor shall not exceed the maximum
amount that can be hereby guaranteed without rendering this Indenture, as it
relates to such Guarantor, voidable under applicable law relating to fraudulent
conveyance or fraudulent transfer or similar laws affecting the rights of
creditors generally. To effectuate the foregoing intention, the obligations of
each Guarantor (other than the Guarantee by Parent and each other parent company
of Issuer) shall be limited to the maximum amount as will, after giving effect
to all other contingent and fixed liabilities of such Guarantor and after giving
effect to any collections from or payments made by or on behalf of any other
Guarantor in respect of the obligations of such other Guarantor under its
Guarantee or pursuant to its contribution obligations hereunder, result in the
obligations of such Guarantor under its Guarantee not constituting a fraudulent
conveyance or fraudulent transfer under federal, state or foreign law. Each
Guarantor that makes a payment or distribution under a Guarantee shall be
entitled to a contribution from each other Guarantor in an amount pro rata based
on the net assets of each Guarantor.

          SECTION 10.3. Successors and Assigns. This Article 10 shall be binding
upon each Guarantor and its successors and assigns and shall inure to the
benefit of the successors and assigns of the Trustee and the Holders and, in the
event of any transfer or assignment of rights by any Holder or the Trustee, the
rights and privileges conferred upon that party in this Indenture and in the
Notes shall automatically extend to and be vested in such transferee or
assignee, all subject to the terms and conditions of this Indenture.

          SECTION 10.4. No Waiver. Neither a failure nor a delay on the part of
either the Trustee or the Holders in exercising any right, power or privilege
under this Article 10 shall operate as a waiver thereof, nor shall a single or
partial exercise thereof preclude any other or further exercise of any right,
power or privilege. The rights, remedies and benefits of the Trustee and the
Holders herein



                                      -80-

expressly specified are cumulative and not exclusive of any other rights,
remedies or benefits which either may have under this Article 10 at law, in
equity, by statute or otherwise.

          SECTION 10.5. Modification. No modification, amendment or waiver of
any provision of this Article 10, nor the consent to any departure by any
Guarantor therefrom, shall in any event be effective unless the same shall be in
writing and signed by the Trustee, and then such waiver or consent shall be
effective only in the specific instance and for the purpose for which given. No
notice to or demand on any Guarantor in any case shall entitle such Guarantor to
any other or further notice or demand in the same, similar or other
circumstances.

          SECTION 10.6. Release of Guarantor. A Guarantor may, by execution and
delivery to the Trustee of a supplemental indenture satisfactory to the Trustee,
be automatically and unconditionally released from its Guarantee upon either of
the following:

          (x)  any sale, exchange or transfer by Parent or any Restricted
     Subsidiary to any Person that is not an Affiliate of Parent of all of the
     Capital Stock of, or all or substantially all the assets of, such
     Restricted Subsidiary, which sale, exchange or transfer is made in
     accordance with the provisions of this Indenture; or

          (y)  the designation of such Restricted Subsidiary as an Unrestricted
     Subsidiary in accordance with the provisions of this Indenture;

provided, in each such case, Parent has delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for in this Indenture relating to such transactions have been
complied with and that such release is authorized and permitted under this
Indenture.

          SECTION 10.7. Execution of Supplemental Indenture for Future
Guarantors. Each Subsidiary which is required to become a Guarantor pursuant to
Section 4.5 shall, and Terra Capital shall cause each such Subsidiary to,
promptly execute and deliver to the Trustee a supplemental indenture in the form
of Exhibit F hereto pursuant to which such Subsidiary shall become a Guarantor
under this Article 10 and shall guarantee the Guaranteed Obligations.
Concurrently with the execution and delivery of such supplemental indenture,
Terra Capital shall deliver to the Trustee an Opinion of Counsel to the effect
that such supplemental indenture has been duly authorized, executed and
delivered by such Subsidiary and that, subject to the application of bankruptcy,
insolvency, moratorium, fraudulent conveyance or transfer and other similar laws
relating to creditors' rights generally and to the principles of equity, whether
considered in a proceeding at law or in equity, the Guarantee of such Guarantor
is a valid and legally binding obligation of such Guarantor, enforceable against
such Guarantor in accordance with its terms.

          SECTION 10.8. Joinder of Additional Guarantors. Terra Capital shall
cause each Subsidiary which, from time to time, after the date hereof shall be
required to become a Guarantor pursuant to Section 4.5, to execute and deliver
to the Collateral Agent (i) a joinder agreement substantially in the form of
Exhibit 3 annexed to the Security Agreement within 30 Business Days of the date
on which it was acquired or created and (ii) a Perfection Certificate within 30
Business Days of the date on which it was acquired or created.



                                      -81-

                                   ARTICLE 11

                                  MISCELLANEOUS

          SECTION 11.1. Trust Indenture Act Controls. If any provision of this
Indenture limits, qualifies or conflicts with another provision which is
required to be included in this Indenture by the TIA, the required provision
shall control. If this Indenture excludes any provision of the TIA that is
required to be included, such provision shall be deemed included herein.

          SECTION 11.2. Notices. Any notice or communication shall be in writing
and delivered in person, by overnight courier or facsimile (if to Terra Capital,
with receipt confirmed by an Officer) or mailed by first-class mail addressed as
follows:

          If to Terra Capital or any Guarantor:

               TERRA INDUSTRIES INC.
               Terra Centre
               600 Fourth Street
               P.O. Box 6000
               Sioux City, Iowa  51102
               Attention:  Chief Financial Officer

          If to the Trustee or Collateral Agent:

               c/o U.S. BANK NATIONAL ASSOCIATION
               180 East Fifth Street
               St. Paul, Minnesota  55101
               Attention:  Corporate Trust Administration

          Terra Capital or the Trustee by notice to the other may designate
additional or different addresses for subsequent notices or communications.

          Any notice or communication mailed or sent by overnight courier or
facsimile to a Holder shall be sent to the Holder at the Holder's address as it
appears on the registration books of the Registrar and shall be sufficiently
given if so sent within the time prescribed.

          Failure to send a notice or communication to a Holder or any defect in
it shall not affect its sufficiency with respect to other Holders. If a notice
or communication is sent in the manner provided above, it is duly given, whether
or not the addressee receives it.

          Where this Indenture provides for notice in any manner, such notice
may be waived in writing by the Person entitled to receive such notice, either
before or after the event, and such waiver shall be the equivalent of such
notice.

          SECTION 11.3. Communication by Holders with Other Holders. Holders may
communicate pursuant to TIA (S) 312(b) with other Holders with respect to their
rights under this In-



                                      -82-

denture or the Notes. Terra Capital, the Trustee, the Registrar and anyone else
shall have the protection of TIA (S) 312(c).

          SECTION 11.4. Certificate and Opinion as to Conditions Precedent. Upon
any request or application by Terra Capital to the Trustee to take or refrain
from taking any action under this Indenture, Terra Capital shall furnish to the
Trustee to the extent required by the TIA or this Indenture:

          (1)  an Officers' Certificate (which in connection with the original
     issuance of the Notes need only be executed by one Officer for Terra
     Capital) in form and substance reasonably satisfactory to the Trustee
     stating that, in the opinion of the signers, all conditions precedent, if
     any, provided for in this Indenture relating to the proposed action have
     been complied with; and

          (2)  an Opinion of Counsel in form and substance reasonably
     satisfactory to the Trustee stating that, in the opinion of such counsel,
     all such conditions precedent have been complied with.

          SECTION 11.5. Statements Required in Certificate or Opinion. Each
certificate or opinion with respect to compliance with a covenant or condition
provided for in this Indenture shall include:

          (1) a statement that the individual making such certificate or opinion
     has read such covenant or condition;

          (2) a brief statement as to the nature and scope of the examination or
     investigation upon which the statements or opinions contained in such
     certificate or opinion are based;

          (3) a statement that, in the opinion of such individual, he has made
     such examination or investigation as is necessary to enable him to express
     an informed opinion as to whether or not such covenant or condition has
     been complied with; and

          (4) a statement as to whether or not, in the opinion of such
     individual, such covenant or condition has been complied with; provided
     that an Opinion of Counsel can rely as to matters of fact on an Officers'
     Certificate or a certificate of a public official.

          SECTION 11.6. When Notes Disregarded. In determining whether the
Holders of the required principal amount of Notes have concurred in any
direction, waiver or consent, Notes owned by Terra Capital or by any Person
directly or indirectly controlling or controlled by or under direct or indirect
common control with Parent shall be disregarded and deemed not to be
outstanding, except that, for the purpose of determining whether the Trustee
shall be protected in relying on any such direction, waiver or consent, only
Notes which the Trustee actually knows are so owned shall be so disregarded.
Also, subject to the foregoing, only Notes outstanding at the time shall be
considered in any such determination.



                                      -83-

          SECTION 11.7.  Rules by Trustee, Paying Agent and Registrar. The
Trustee may make reasonable rules for action by or a meeting of Holders. The
Trustee shall provide Terra Capital reasonable notice of such rules. The
Registrar and the Paying Agent may make reasonable rules for their functions.

          SECTION 11.8.  Legal Holidays. If a payment date is a Legal Holiday,
payment shall be made on the next succeeding day that is not a Legal Holiday,
and no interest shall accrue for the intervening period. If a regular record
date is a Legal Holiday, the record date shall not be affected.

          SECTION 11.9.  Governing Law. This Indenture and the Notes shall be
governed by, and construed in accordance with, the laws of the State of New York
without giving effect to applicable principles of conflict of laws to the extent
that the application of the laws of another jurisdiction would be required
thereby.

          SECTION 11.10. No Recourse Against Others. No recourse for the payment
of the principal of or interest on any of the Notes or for any claim based
thereon or otherwise in respect thereof, and no recourse under or upon any
obligation, covenant or agreement of Terra Capital or any Guarantor in this
Indenture, or in any of the Notes or the Guarantees or because of the creation
of any Indebtedness represented hereby and thereby, shall be had against any
incorporator, stockholder, officer, director, employee or controlling person of
Parent or any of its Subsidiaries. Each Holder, by accepting a Note, waives and
releases all such liability. The waiver and release shall be part of the
consideration for the issuance of the Notes.

          SECTION 11.11. Successors. All agreements of Terra Capital in this
Indenture and the Notes shall bind Terra Capital's successors. All agreements of
the Trustee in this Indenture shall bind its successors.

          SECTION 11.12. Multiple Originals. The parties may sign any number of
copies of this Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement. One signed copy is enough to prove this
Indenture.

          SECTION 11.13. Table of Contents; Headings. The table of contents,
cross-reference sheet and headings of the Articles and Sections of this
Indenture have been inserted for convenience of reference only, are not intended
to be considered a part hereof and shall not modify or restrict any of the terms
or provisions hereof.

          SECTION 11.14. Severability Clause. In case any provision in this
Indenture or in the Notes shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby.


                                      -84-

                                   ARTICLE 12

                               SECURITY DOCUMENTS

          SECTION 12.1. Security Documents; Additional Collateral.

          (a) Security Documents. In order to secure the due and punctual
payment of the Notes, the Pledgors and the Trustee shall on the Issue Date enter
into the Security Documents to create the Security Interests and for related
matters. The Trustee and the Pledgors hereby agree that the Trustee holds the
Collateral in trust for its benefit and the benefit of the Holders pursuant to
the terms of the Security Documents. Unless an Event of Default has occurred and
is continuing and subject to the Intercreditor Agreement, the Pledgors will have
the right to remain in possession and retain exclusive control of the
Collateral, to freely operate the Collateral and to collect, invest and dispose
any income thereon.

          (b) Additional Collateral. Promptly upon the acquisition or receipt by
Issuer or any Pledgor of After-Acquired Property:

          (i) Issuer or the applicable Pledgor, as the case may be, and the
     Trustee will, if necessary, enter into such amendments or supplements to
     the Security Documents (in registerable or recordable form) and other
     Security Documents, and Issuer shall cause such amendments, supplements and
     other Security Documents to be filed and recorded in all such governmental
     offices as shall be necessary in order to grant and create a valid second
     priority Lien on and security interest in such After-Acquired Property in
     favor of the Trustee (subject to no Liens except Collateral Permitted
     Liens), and Issuer shall cause appropriate financing statements to be filed
     in such governmental offices as shall be reasonably necessary in order to
     perfect any security interest in such After-Acquired Property as to which a
     security interest may, under the UCC of the applicable jurisdiction, be
     perfected by the filing of a financing statement and, if any such
     After-Acquired Property consists of stock certificates, promissory notes or
     other property as to which, under the relevant UCC, a security interest may
     be perfected only by possession, subject to the terms and conditions of the
     Security Documents, deliver such certificates, promissory notes and other
     property, together with stock powers or assignments duly endorsed in blank,
     to the Trustee;

          (ii) in the case of After-Acquired Property which constitutes personal
     property having a value in excess of $10,000,000, and to the extent
     additional recordings, registrations or filings are necessary to create
     and/or perfect a Security Interest in such personal property under the
     Security Documents, Issuer or the applicable Pledgor, as the case may be,
     shall also deliver to the Trustee the following:

               (A) an Opinion of Counsel substantially to the effect that, in
          the opinion of such counsel, the applicable Security Documents and all
          other instruments of further assurance or assignment have been
          properly recorded, registered and filed to the extent necessary to
          create and/or perfect the Security Interests in such personal property
          under the Security Documents and reciting the details of such action
          and stating that as to such Security Interests under such Security
          Documents, such recordings,



                                      -85-

          registrations and filings are the only recordings, registrations and
          filings necessary to give notice thereof and no re-recordings,
          re-registrations or refilings are necessary to maintain such notice
          (other than as stated in such opinion);

                (B) an Officers' Certificate of Issuer stating that any specific
          Liens on such personal property are Collateral Permitted Liens; and

                (C) evidence of payment or a closing statement indicating
          payments to be made of all filing fees, recording charges, transfer
          taxes and other costs and expenses including reasonable legal fees and
          disbursements of counsel for the Trustee (and any local counsel) that
          may be incurred to validly and effectively subject such personal
          property to the Lien of any applicable Security Document to perfect
          such Liens;

          (iii) Issuer or the applicable Pledgor shall deliver to the Trustee an
     Opinion of Counsel and an Officers' Certificate to the effect that the
     documents that have been or are therewith delivered to the Trustee pursuant
     to this Section 12.1(b) (including any amendments, supplements or other
     Security Documents referred to in paragraph (i) above) conform to the
     requirements of this Indenture.

          (c)   Each Holder, by accepting a Note, agrees to all of the terms and
provisions of the Security Documents, as the same may be amended from time to
time pursuant to the provisions of the Security Documents and this Indenture.

          SECTION 12.2. Recording, Etc.

          (a)   Parent shall, and shall cause each other Pledgor to, take or
cause to be taken all action required or desirable to maintain, perfect,
preserve and protect the Security Interests in the Collateral granted by the
Security Documents, including, but not limited to, causing all financing
statements, mortgages, other instruments of further assurance, including,
without limitation, continuation statements covering security interests in
personal property, and all mortgages securing purchase money obligations
delivered to the Trustee to be promptly recorded, registered and filed, and at
all times to be kept recorded, registered and filed, and will execute and file
such financing statements and cause to be issued and filed such continuation
statements, all in such manner and in such places as may be required by law
fully to preserve and protect the rights of the Holders and the Trustee under
this Indenture and the Security Documents to all property comprising the
Collateral.

          (b)   Issuer shall furnish or cause to be furnished to the Trustee:

          (i)   at the time of execution and delivery of this Indenture,
     Opinion(s) of Counsel substantially in the form of the opinions of counsel
     delivered on the Issue Date to the Initial Purchasers;


          (ii)  to the extent as would be required by the TIA, within 30 days
     after the Issue Date, Opinion(s) of Counsel either (a) substantially to the
     effect that, in the opinion of such counsel, this Indenture, each Security
     Document and all other instruments of further assurance or assignment have
     been properly recorded, registered and filed to the extent necessary to
     per-


                                      -86-

     fect or create the Security Interests created by each such Security
     Document and reciting the details of such action, and stating that as to
     the Security Interests created pursuant to each such Security Document,
     such recordings, registerings and filings are the only recordings,
     registerings and filings necessary to give notice thereof and that no
     re-recordings, re-registerings or refilings are necessary to maintain such
     notice (other than as stated in such opinion), or (b) to the effect that,
     in the opinion of such counsel, no such action is necessary to perfect such
     Security Interests; and

          (iii) within 30 days after May 19 in each year beginning with May 19,
     2004, an Opinion of Counsel, dated as of such date, either (a) to the
     effect that, in the opinion of such counsel, such action has been taken
     with respect to the recordings, registerings, filings, re-recordings,
     re-registerings and refilings of all instruments of further assurance as is
     necessary to maintain the Security Interests of each of the Security
     Documents and reciting with respect to such Security Interests the details
     of such action or referencing prior Opinions of Counsel in which such
     details are given, and stating that all instruments have been executed
     and/or filed that are necessary fully to preserve and protect the rights of
     the Holders and the Trustee hereunder and under each of the Security
     Documents with respect to the Security Interests, or (b) to the effect
     that, in the opinion of such counsel, no such action is necessary to
     maintain such Security Interests.

          (c)   Parent shall, and shall cause each other Pledgor to, take or
cause to be taken all action required or desirable to maintain, perfect,
preserve and protect the Security Interests in the Collateral granted by the
Security Documents, including, but not limited to, causing all financing
statements, mortgages, other instruments of further assurance, including,
without limitation, continuation statements covering security interests in
personal property, and all mortgages securing purchase money obligations
delivered to the Trustee to be promptly recorded, registered and filed in every
jurisdiction where Parent or each other Pledgor takes such action for the
benefit of a prior lienholder or has knowledge of such action being taken.

          SECTION 12.3. Possession, Use and Release of Collateral.

          (a)   The Issuers and the Guarantors shall be permitted to sell and
use substantial portions of the Collateral in the ordinary course of business or
in connection with an Asset Sale otherwise complying with the provisions of this
Indenture. The liens created by the Security Documents will automatically be
released in connection with a disposition of Collateral of the type described
above.

          (b)   The Liens created by the Security Documents will be
automatically released upon satisfaction of all of the following conditions:

          (1)   the Collateral being released from all Liens securing the Credit
     Facility Obligations;

          (2)   no Event of Default, or event that with the passage of time or
     giving of notice would become an Event of Default, having occurred and
     continuing;


                                      -87-

          (3)  Issuer having obtained an unsecured Credit Facility providing
     minimum availability of $50 million with a tenor of at least a year; and

          (4)  the delivery of an Officer's Certificate to the Trustee
     certifying that:

          (i)  the condition specified in clauses (1), (2) and (3) above have
     been satisfied or will be satisfied concurrently with the release of Liens
     created by the Security Documents, and

          (ii) that neither the Issuer, Parent or any Guarantor has any present
     intention to grant a Lien with respect to the Collateral to any other
     Person securing Obligations in respect of Indebtedness.

          (c)  In connection with any release, Issuer shall (i) execute, deliver
and record or file and obtain such instruments as the Trustee may reasonably
require, including, without limitation, amendments to the Security Documents,
and (ii) deliver to the Trustee such evidence of the satisfaction of the
applicable provisions of this Indenture and the Security Documents as the
Trustee may reasonably require.

          Any releases of Collateral made in strict compliance with the
provisions of this Section 12.3 shall be deemed not to impair the Security
Interests created by the Security Documents in favor of the Collateral Agent, in
contravention of the provisions of this Indenture.

          SECTION 12.4. Trust Indenture Act Requirements. The release of any
Collateral, whether pursuant to Article 12 or 13, from the Lien of any of the
Security Documents or the release of, in whole or in part, the Liens created by
any of the Security Documents will not be deemed to impair the Security
Interests in contravention of the provisions hereof if and to the extent the
Collateral or Liens are released pursuant to the applicable Security Documents
and pursuant to the terms hereof. The Trustee and each of the Holders of the
Notes acknowledge that a release of Collateral or Liens strictly in accordance
with the terms of the Security Documents and the terms hereof will not be deemed
for any purpose to be an impairment of the Security Interests in contravention
of the terms of this Indenture. To the extent applicable, without limitation,
the Pledgors and each obligor on the Notes shall cause TIA ss. 314(d) relating
to the release of property or securities from the Liens hereof and of the
Security Documents to be complied with. Any certificate or opinion required by
TIA ss. 314(d) may be made by an Officer of the appropriate Pledgor, except in
cases in which TIA ss. 314(d) requires that such certificate or opinion be made
by an independent Person.

          SECTION 12.5. Suits To Protect the Collateral. Subject to the
provisions of the Security Documents, the Trustee shall have power to institute
and to maintain such suits and proceedings as it may deem expedient to prevent
any impairment of the Collateral by any acts which may be unlawful or in
violation of any of the Security Documents or this Indenture, and such suits and
proceedings as the Trustee may deem expedient to preserve or protect its
interests and the interests of the Trustee and the Holders of the Notes in the
Collateral (including power to institute and maintain suits or proceedings to
restrain the enforcement of or compliance with any legislative or other
governmental enactment, rule or order that may be unconstitutional or otherwise
invalid if the enforcement of, or compliance with, such enactment, rule or order
would impair the Security Interests or be prejudicial to the interests of the
Holders of the Notes or the Trustee).


                                      -88-

          SECTION 12.6. Purchaser Protected. In no event shall any purchaser in
good faith of any property purported to be released hereunder be bound to
ascertain the authority of the Trustee to execute the release or to inquire as
to the satisfaction of any conditions required by the provisions hereof for the
exercise of such authority or to see to the application of any consideration
given by such purchaser or other transferee; nor shall any purchaser or other
transferee of any property or rights permitted by this Article 12 to be sold be
under obligation to ascertain or inquire into the authority of Issuer or any
other Pledgor, as applicable, to make any such sale or other transfer.

          SECTION 12.7. Powers Exercisable by Receiver or Trustee. In case the
Collateral shall be in the possession of a receiver or trustee, lawfully
appointed, the powers conferred in this Article 12 upon Issuer or any other
Pledgor, as applicable, with respect to the release, sale or other disposition
of such property may be exercised by such receiver or trustee, and an instrument
signed by such receiver or trustee shall be deemed the equivalent of any similar
instrument of Issuer or any other Pledgor, as applicable, or of any officer or
officers thereof required by the provisions of this Article 12.

          SECTION 12.8. Disposition of Obligations Received. All purchase money
or other obligations received by the Trustee under this Article 12 shall be held
by the Trustee as a part of the Collateral. Upon payment in cash or Temporary
Cash Investments by or on behalf of Issuer or the obligor thereof to the Trustee
of the entire unpaid principal amount of any such obligation, the Trustee shall
promptly release and transfer such obligation and any mortgage securing the same
upon receipt of any documentation that the Trustee may reasonably require. Any
cash or Temporary Cash Investments received by the Trustee in respect of the
principal of any such obligations shall be held by the Trustee as Trust Monies
under Article 13 subject to application as therein provided. Unless and until
the Notes are accelerated, pursuant to Section 6.2, all interest and other
income on any such obligations, when received by the Trustee, shall be paid to
Issuer from time to time in accordance with Section 13.8. If the Notes have been
accelerated pursuant to Section 6.2, any such interest or other income not
theretofore paid, when collected by the Trustee, shall be applied by the Trustee
in accordance with Section 6.10 of this Indenture.

          SECTION 12.9. Determinations Relating to Collateral. In the event (i)
the Trustee shall receive any written request from Issuer or any other Pledgor
under any Security Document for consent or approval with respect to any matter
or thing relating to any Collateral or Issuer's or any other Pledgor's
obligations with respect thereto or (ii) there shall be required from the
Trustee under the provisions of any Security Document any performance or the
delivery of any instrument or (iii) a Responsible Officer of the Trustee shall
become aware of any nonperformance by Issuer or any other Pledgor of any
covenant or any breach of any representation or warranty of the Issuer or any
other Pledgor set forth in any Security Document, and, in the case of clause
(i), (ii) or (iii) above, the Trustee's response or action is not otherwise
specifically contemplated hereunder then, in each such event, the Trustee shall,
within seven Business Days, advise the Holders of the Notes, in writing, of the
matter or thing as to which consent has been requested or the performance or
instrument required to be delivered or the nonperformance or breach of which the
Trustee has become aware. The Holders of not less than a majority in aggregate
principal amount of the outstanding Notes pursuant to Section 6.5 shall have the
exclusive authority to direct the Trustee's response to any of the circumstances
contemplated in clauses (i), (ii) and (iii) above. In the event the Trustee
shall be required to respond to any of the circumstances contemplated in this
Section 12.9, the Trustee shall not be required so to respond



                                      -89-

unless it shall have received written authority by not less than a majority in
aggregate principal amount of the outstanding Notes; provided that the Trustee
shall be entitled to hire experts, consultants, agents and attorneys to advise
the Trustee on the manner in which the Trustee should respond to such request or
render any requested performance or response to such nonperformance or breach
(the expenses of which shall be reimbursed to the Trustee pursuant to Section
7.7). The Trustee shall be fully protected, as the case may be, should respond
to such request or render any requested performance or response to such
nonperformance or expert, consultant, agent or attorney or agreed to by Notes
pursuant to Section 6.5.

          SECTION 12.10. Renewal and Refunding. Nothing in this Article 12 shall
prevent (i) the renewal or extension, without impairment of the Security
Interests, at the same or at a lower or higher rate of interest, of any of the
obligations or Indebtedness of any Person included in the Collateral or (ii) the
issue in substitution for any such obligations or Indebtedness of other
obligations or Indebtedness of such Person for equivalent amounts and of
substantially equal or superior rank as to security, if any; provided that every
such obligation or Indebtedness as so renewed or extended shall continue to be
subject to the Lien of the Security Documents and every substituted obligation
of Indebtedness and the evidence thereof shall be deposited and pledged with the
Trustee.

          SECTION 12.11. Release upon Termination of Issuer's Obligations. In
the event that Issuer delivers an Officers' Certificate certifying that its
obligations under this Indenture have been satisfied and discharged by complying
with the provisions of Article 8, the Trustee shall (i) execute and deliver, in
each case without recourse, representation or warranty such releases,
termination statements and other instruments (in recordable form, where
appropriate) as Issuer or any other Pledgor, as applicable, may reasonably
request evidencing the termination of the Security Interests created by the
Security Documents and (ii) not be deemed to hold the Security Interests for the
benefit of the Trustee and the Holders of the Notes.

          SECTION 12.12. Casualty Events Relating to Collateral. In the event
that there is no Person having a prior Lien on the Collateral, all proceeds
received by the Issuer, the Parent or any Guarantor from a Casualty Event
relating to any portion of the Collateral shall be made available to the
Collateral Agent.

                                   ARTICLE 13

                           APPLICATION OF TRUST MONIES

          SECTION 13.1. Trust Monies. All Trust Monies shall be held by or
delivered to the Trustee, for its benefit and the benefit of the Holders of
Notes as a part of the Collateral in accordance with Section 12.12 and the
applicable Security Documents, and said Trust Monies shall be applied in
accordance with Section 6.10.

          In the event that there is no Person having a prior Lien on the
Collateral there shall be established and, at all times thereafter until this
Indenture shall have terminated, there shall be maintained with the Trustee an
account which shall be entitled the "Collateral Account" (the "Collateral
Account"). The Collateral Account shall be established and maintained by the
Trustee at its corporate


                                      -90-

trust office located in New York. All Trust Monies that are received by the
Trustee shall be held, applied and/or disbursed by the Trustee in accordance
with the provisions of this Article 13.

          SECTION 13.2. Retirement of Notes. Subject to the limitations set
forth in Section 4.13 and paragraph 5 of the Notes, the Trustee shall apply
Trust Monies from time to time to the payment of the principal amount of and
interest on any Notes, when due or to the redemption thereof or the purchase
thereof upon tender pursuant to a Net Proceeds Offer or Section 4.8, as Issuer
shall request in writing, upon receipt by the Trustee of the following:

          (a)  Board resolutions directing the application pursuant to this
     Section 13.2 of a specified amount of Trust Monies and, in case any such
     moneys are to be applied to the payment of Notes, designating the Notes so
     to be paid and, in case any such moneys are to be applied to the purchase
     of Notes, prescribing the method of purchase, the price or prices to be
     paid and the maximum principal amount of Notes to be purchased and any
     other provisions of this Indenture governing such purchase;

          (b)  U.S. Legal Tender in the maximum amount of the accrued interest,
     if any, required to be paid in connection with any such purchase, which
     cash shall be held by the Trustee in trust for such purpose;

          (c)  an Officers' Certificate, dated not more than five Business Days
     prior to the date of the relevant application stating

               (i)  that no Default or Event of Default exists unless such
          Default or Event of Default would be cured thereby; and

               (ii) that all conditions precedent and covenants herein provided
          for relating to such application of Trust Monies have been complied
          with; and

          (d)  an Opinion of Counsel stating that the documents and the cash or
     Temporary Cash Investments, if any, which have been or are therewith
     delivered to and deposited with the Trustee conform to the requirements of
     this Indenture and that all conditions precedent herein provided for
     relating to such application of Trust Monies have been complied with.

          Upon compliance with the foregoing provisions of this Section, the
Trustee shall apply Trust Monies as directed and specified by such board
resolution, up to, but not exceeding, the principal amount of the Notes so paid
or purchased, using the U.S. Legal Tender deposited pursuant to paragraph (b) of
this Section 13.2, to the extent necessary, to pay any accrued interest required
in connection with such purchase.

          A board resolution expressed to be irrevocable directing the
application of Trust Monies under this Section 13.2 to the payment of the
principal of particular Notes shall for all purposes of this Indenture be deemed
the equivalent of the deposit of money with the Trustee in trust for such
purpose. Such Trust Monies and any U.S. Legal Tender deposited with the Trustee
pursuant to paragraph (b) of this Section 13.2 for the payment of accrued
interest shall not, after compliance with the foregoing provisions of this
Section, be deemed to be part of the Collateral or Trust Monies.


                                      -91-

          SECTION 13.3. Withdrawals of Caualty Events Proceeds. Any Trust Monies
may be withdrawn by Issuer or any Pledgor, as applicable, and shall be paid by
the Trustee upon a request by Issuer or the applicable Pledgor by the proper
officer or officers of Issuer or the applicable Pledgor to reimburse Issuer or
the applicable Pledgor for expenditures made, or to pay costs incurred, by
Issuer or the applicable Pledgor to repair, rebuild or replace the Collateral
the subject of any Casualty Event upon receipt by the Trustee of the following:

          (a)  an Officers' Certificate of Issuer or the applicable Pledgor
     dated not more than 30 days prior to the date of the application for the
     withdrawal and payment of such Trust Monies and (if required by the TIA)
     signed also, in the case of the following clauses (i), (iv) and (vi), by an
     Independent Financial Advisor, setting forth:

               (i)   expenditures have been made, or costs incurred, by Issuer
          or the applicable Pledgor in a specified amount for the purpose of
          making certain repairs, rebuildings and replacements of the
          Collateral, which shall be briefly described, and stating the fair
          market value thereof to Issuer or the applicable Guarantor at the date
          of the acquisition thereof by Issuer or the applicable Pledgor, except
          that it shall not be necessary under this clause (i) to state the fair
          market value of any such repairs, rebuildings or replacements that are
          separately described pursuant to clause (v) of this paragraph (a) and
          whose fair market value is stated in the Independent Financial
          Advisor's certificate under paragraph (b) of this Section 13.3;

               (ii)  that no part of such expenditures in any previous or then
          pending application has been or is being made the basis for the
          withdrawal of any Trust Monies pursuant to this Section 13.3;

               (iii) that there is no outstanding Indebtedness, other than costs
          for which payment is being requested, known to Issuer or the
          applicable Pledgor, after due inquiry, for the purchase price or
          construction of such repairs, rebuildings or replacements, or for
          labor, wages, materials or supplies in connection with the making
          thereof, which, if unpaid, might become the basis of a vendor's,
          mechanics', laborers', materialmen's, statutory or other similar Lien
          upon any of such repairs, rebuildings or replacement, which Lien
          might, in the opinion of the signers of such certificate, materially
          impair the security afforded by such repairs, rebuildings or
          replacement;

               (iv)  that the property to be repaired, rebuilt or replaced is
          necessary or desirable in the conduct of either Issuer's or the
          applicable Pledgor's business;

               (v)   whether any part of such repairs, rebuildings or
          replacements within six months before the date of acquisition thereof
          by Issuer or the applicable Pledgor has been used or operated by
          Persons other than Issuer or the applicable Pledgor in a business
          similar to that in which such property has been or is to be used or
          operated by Issuer or the applicable Pledgor, and whether the fair
          market value to Issuer or the applicable Pledgor, at the date of such
          acquisition, of such part of such repairs, rebuildings or replacement
          is at least $25,000 or 1% of the aggregate principal amount of the
          outstanding Notes; and, if all of such facts are present, such part of
          said repairs, rebuildings or replacements shall be separately
          described, and it shall be stated that an


                                      -92-

          Independent Financial Advisor's certificate as to the fair market
          value to Issuer or the applicable Guarantor of such separately
          described repairs, rebuildings or replacements will be furnished under
          paragraph (b) of this Section 13.3;

               (vi)  that no Default or Event of Default shall have occurred and
          be continuing; and

               (vii) that all conditions precedent herein provided for relating
          to such withdrawal and payment have been complied with.

          (b)  In case any part of such repairs, rebuildings or replacements is
     separately described pursuant to the foregoing clause (v) of paragraph (a)
     of this Section 13.3, a certificate of an Independent Financial Advisor (if
     required by the TIA) stating the fair market value to Issuer or the
     applicable Pledgor, in such Independent Financial Advisor's opinion, of
     such separately described repairs, rebuildings or replacements at the date
     of the acquisition thereof by Issuer or the applicable Pledgor.

          (c)  An Opinion of Counsel to the effect:

               (i)  that the instruments that have been or are therewith
          delivered to the Trustee conform in all material respects to the
          requirements of this Indenture and any other applicable Security
          Document, and that, upon the basis of such request of Issuer or the
          applicable Guarantor and the accompanying documents specified in this
          Section 13.3, all conditions precedent herein provided for relating to
          such withdrawal and payment have been complied with, and the Trust
          Monies whose withdrawal is then requested may be lawfully paid over
          under this Section 13.3; and

               (ii) that all of Issuer's or the applicable Guarantor's right,
          title and interest in and to said repairs, rebuildings or
          replacements, or combination thereof, are then subject to the Lien of
          any of the Security Documents.

          Upon compliance with the foregoing provisions of this Section 13.3,
the Trustee shall pay on the written request of Issuer an amount of Trust Monies
of the character aforesaid equal to the amount of the expenditures or costs
stated in the Officers' Certificate required by clause (i) of paragraph (a) of
this Section 13.3, or the fair market value to the Issuer of such repairs,
rebuildings and replacements stated in such Officers' Certificate (and in such
Independent Financial Advisor's certificate, if required by paragraph (b) of
this Section 13.3), whichever is less.

          SECTION 13.4. Powers Exercisable Notwithstanding Event of Default. In
case an Event of Default shall have occurred and shall be continuing, Issuer or
any Pledgor, as applicable, while in possession of Collateral (other than cash,
Temporary Cash Investments, securities and other personal property held by, or
required to be deposited or pledged with, the Trustee hereunder or under the
Security Documents or with the trustee, mortgagee or other holder of a prior
Lien), may do any of the things enumerated in Sections 13.2 and 13.3 if the
Holders of a majority in aggregate principal amount of the Notes outstanding, by
appropriate action of such Holders, shall consent to such action,



                                      -93-

in which event any certificate filed under any of such Sections shall omit the
statement to the effect that no Event of Default has occurred and is continuing.
This Section 13.4 shall not apply, however, during the continuance of an Event
of Default of the type specified in Section 6.1(i) or (ii).

          SECTION 13.5. Powers Exercisable by Trustee or Receiver. In case the
Collateral (other than any cash, Temporary Cash Investments, securities and
other personal property held by, or required to be deposited or pledged with,
the Trustee hereunder or under the Security Documents or with the trustee,
mortgagee or other holder of a prior Lien) shall be in the possession of a
receiver or trustee lawfully appointed, the powers hereinbefore in this Article
13 conferred upon Issuer and any Guarantor, as applicable, with respect to the
withdrawal or application of Trust Monies may be exercised by such receiver or
trustee, in which case a certificate signed by such receiver or trustee shall be
deemed the equivalent of any Officers' Certificate required by this Article 13.
If the Trustee shall be in possession of any of the Collateral hereunder or
under any of the Security Documents, such powers may be exercised by the
Trustee, in its discretion.

          SECTION 13.6. Disposition of Notes Retired. All Notes received by the
Trustee and for whose purchase Trust Monies are applied under this Article 13,
if not otherwise canceled, shall be promptly delivered to the Trustee for
cancellation and destruction unless the Trustee shall be otherwise directed in
writing by Issuer. Upon destruction of any Notes, the Trustee shall issue a
certificate of destruction to Issuer.

          SECTION 13.7. Investment of Trust Monies. All or any part of any Trust
Monies held by the Trustee hereunder (except such as may be held for the account
of any particular Notes) shall from time to time be invested or reinvested by
the Trustee in any Temporary Cash Investments pursuant to the written direction
of Issuer which shall specify the Temporary Cash Investments in which such Trust
Monies shall be invested. Unless an Event of Default occurs and is continuing,
any interest on such Temporary Cash Investments (in excess of any accrued
interest paid at the time of purchase) which may be received by the Trustee
shall be forthwith paid to Issuer. Such Temporary Cash Investments shall be held
by the Trustee as a part of the Collateral, subject to the same provisions
hereof as the cash used by it to purchase such Temporary Cash Investments.

          The Trustee shall not be liable or responsible for any loss resulting
from such investments or sales except only for its own grossly negligent action,
its own grossly negligent failure to act or its own willful misconduct in
complying with this Section 13.7.



                                      S-1

          IN WITNESS WHEREOF, the parties have caused this Indenture to be duly
executed as of the date first written above.

                                     TERRA CAPITAL, INC.


                                     By:  /s/ Mark A. Kalafut
                                          --------------------------------------
                                          Name:
                                          Title:


                                     GUARANTORS:

                                     BEAUMONT AMMONIA INC.
                                     BEAUMONT HOLDINGS CORPORATION
                                     BMC HOLDINGS INC.
                                     PORT NEAL CORPORATION
                                     TERRA CAPITAL HOLDINGS, INC.
                                     TERRA INDUSTRIES INC.
                                     TERRA INTERNATIONAL, INC.
                                     TERRA INTERNATIONAL (OKLAHOMA) INC.
                                     TERRA METHANOL CORPORATION
                                     TERRA NITROGEN CORPORATION
                                     TERRA REAL ESTATE CORP.
                                     TERRA (U.K.) HOLDINGS INC.


                                     By:  /s/ Mark A. Kalafut
                                          --------------------------------------
                                          Name:
                                          Title::



                                      S-2

                                     U.S. BANK NATIONAL ASSOCIATION,
                                         as Trustee

                                     By:  /s/ Richard Prokosch
                                          ----------------------
                                          Name:
                                          Title:



                                                                       EXHIBIT A

                                 [FACE OF NOTE]

No.                                                             CUSIP No.

                               TERRA CAPITAL, INC.

              11 1/2% SECOND PRIORITY SENIOR SECURED NOTES DUE 2010

          TERRA CAPITAL, INC., a Delaware corporation (the "Company"), promises
to pay to Cede & Co., or registered assigns, the principal sum of         ($
       ) Dollars on     , 2010.

          Interest Payment Dates: June 1 and December 1.

          Record Dates: May 15 and November 15.

          Additional provisions of this Note are set forth on the reverse side
of this Note.

          IN WITNESS WHEREOF, the Company has caused this Note to be signed
manually or by facsimile by a duly authorized officer.

                                           TERRA CAPITAL, INC.




                                           By: _________________________________
                                               Name:
                                               Title:


Dated:

                                      A-1



                            TRUSTEE'S CERTIFICATE OF
                                 AUTHENTICATION

          U.S. Bank National Association, as Trustee, certifies that this is one
of the Notes referred to in the within-mentioned Indenture.

                                              U.S. BANK NATIONAL ASSOCIATION, as
                                                Trustee


                                                  ______________________________
                                                  Authorized Signatory

Date of Authentication:

                                      A-2



                                 REVERSE OF NOTE

              11 1/2% SECOND PRIORITY SENIOR SECURED NOTES DUE 2010

1.   Interest

          TERRA CAPITAL, INC., a Delaware corporation (such entity, and its
successors and assigns under the Indenture, the "Company"), promises to pay
interest on the principal amount of this Note at the rate per annum shown above.
The Company will pay interest semiannually on June 1 and December 1 of each
year, commencing December 1, 2003. Interest on the Notes will accrue from the
most recent date on which interest has been paid or, if no interest has been
paid, from May 21, 2003. Interest will be computed on the basis of a 360-day
year of twelve 30-day months. The Company shall pay interest on overdue
principal at 1% per annum in excess of the rate borne by the Notes, and it shall
pay interest on overdue installments of interest at the same rate to the extent
lawful.

2.   Method of Payment

          The Company will pay interest on the Notes (except defaulted interest)
to the Persons who are registered holders of Notes at the close of business on
the record date immediately preceding the interest payment date even if Notes
are canceled on registration of transfer or registration of exchange (including
pursuant to an Exchange Offer (as defined in the Registration Rights Agreement))
after the record date. Holders must surrender Notes to a Paying Agent to collect
principal payments. The Company will pay principal and interest in money of the
United States that at the time of payment is legal tender for payment of public
and private debts ("U.S. Legal Tender"). However, the Company may pay principal
and interest by its check payable in such U.S. Legal Tender. The Company may
deliver any such interest payment to the Paying Agent or to a Holder's
registered address.

3.   Paying Agent and Registrar

          Initially, U.S. Bank National Association, a national banking
corporation (the "Trustee"), will act as Paying Agent and Registrar. The Company
may appoint and change any Paying Agent, Registrar or co-registrar without
notice. The Company may act as Paying Agent, Registrar, co-Registrar or transfer
agent.

4.   Indenture

          The Company issued the Notes under an Indenture dated as of May 21,
2003 (the "Indenture"), among the Company, the Guarantors party thereto and the
Trustee. This Note is one of a duly authorized issue of Initial Notes of the
Company designated as its 11 1/2% Second Priority Senior Secured Notes due 2010
(the "Initial Notes"). The Notes include the Initial Notes and the Exchange
Notes (as defined in the Indenture) issued in exchange for the Initial Notes
pursuant to the Registration Rights Agreement. The Initial Notes and the
Exchange Notes are treated as a single class of Notes under the Indenture. The
terms of the Notes include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C. ss.
77aaa-77bbbb) as in effect on the date of the Indenture (the "TIA"). Terms
defined in the Indenture and not defined herein have the meanings ascribed
thereto in the Indenture. The Notes are subject to all such

                                      A-3



terms, and Holders are referred to the Indenture and the TIA for a statement of
those terms. Any conflict between this Note and the Indenture will be governed
by the Indenture.

          The Notes are senior secured obligations of the Company limited to
$202,000,000 aggregate principal amount (subject to Section 2.7 of the
Indenture). The Indenture imposes certain limitations on the ability of Parent
and its Restricted Subsidiaries to incur Indebtedness, create Liens, pay
dividends on or repurchase Capital Stock of Parent and its Affiliates, make
Restrictive Payments, make investments, sell Assets, enter into transactions
with Affiliates, limit dividends or other distribution from restricted
Subsidiaries, impair Security Interest, enter into Sale and Leaseback
Transactions, engage in other businesses or merge, consolidate or transfer all
or substantially all of the assets of Parent and its Restricted Subsidiaries.

          To guarantee the due and punctual payment of the principal, premium
and interest, if any, on the Notes and all other amounts payable by the Company
under the Indenture and the Notes when and as the same shall be due and payable,
whether at maturity, by acceleration or otherwise, according to the terms of the
Notes and the Indenture, the Guarantors have unconditionally guaranteed the
obligations of the Company under the Indenture and the Notes on a senior secured
basis pursuant to the terms of the Indenture.

5.   Optional Redemption

          (a) Prior to June 1, 2007 the Notes will be redeemable, in whole at
any time or in part from time to time, at the option of Issuer, upon not less
than 30 nor more than 60 days' notice, at a redemption price equal to the sum of
(x) 100% of the principal amount thereof, plus accrued and unpaid interest, if
any, thereon to the redemption date, plus the Make Whole Amount, if any.

          (b) Thereafter, the Notes will be redeemable at the option of Issuer,
in whole or in part, at any time after June 1, 2007, at the redemption prices
(expressed as a percentage of principal amount) set forth below, plus accrued
and unpaid interest thereon, if any, to the redemption date (subject to the
right of holders of record on the relevant record date to receive interest due
on the relevant interest payment date), if redeemed during the twelve-month
period beginning on June 1 of the years indicated below:

                                                               Redemption
     Year                                                        Price
     ----                                                      ----------

     2007 .................................................     105.750%
     2008 .................................................     102.875%
     2009 and thereafter ..................................     100.000%

          (c) Notwithstanding the foregoing, at any time on or prior to June 1,
2006, Issuer may at its option on any one or more occasions redeem Notes in an
aggregate principal amount not to exceed 35% of the aggregate principal amount
of Notes issued under the Indenture at a redemption price of 111.50% of the
principal amount, plus accrued and unpaid interest to the redemption date, with
the net cash proceeds of one or more Equity Offerings; provided that (1) at
least 65% of the aggregate principal amount of Notes issued under the Indenture
remains outstanding immediately after the occurrence of such redemption
(excluding Notes held by Parent and its Subsidiaries); and (2) the redemption
occurs within 90 days of the date of the closing of such Equity Offering.

                                      A-4



6.   Notice of Redemption

         Notice of redemption will be mailed by first-class mail at least 30
days but not more than 60 days before the redemption date to each Holder of
Notes to be redeemed at his registered address. Notes in denominations larger
than $1,000 may be redeemed in part but only in whole multiples of $1,000. If
money sufficient to pay the redemption price of and accrued interest on all
Notes (or portions thereof) to be redeemed on the redemption date is deposited
with the Paying Agent on or before the redemption date and certain other
conditions are satisfied, on and after such date interest ceases to accrue on
such Notes (or such portions thereof) called for redemption. If a notice or
communication is sent in the manner provided in the Indenture, it is duly given,
whether or not the addressee receives it. Failure to send a notice or
communication to a Holder or any defect in it shall not affect its sufficiency
with respect to other Holders.

7.   Change of Control

         Upon a Change of Control, each Holder of Notes will have the right to
require the Company to purchase all or any part (equal to $1,000 or an integral
multiple thereof) of the Notes of such Holder at a purchase price in cash equal
to 101% of the principal amount of the Notes to be purchased plus accrued and
unpaid interest, if any, to the date of purchase (subject to the right of
Holders of record on the relevant record date to receive interest due on an
interest payment date that is on or prior to the date fixed for redemption) as
provided in, and subject to the terms of, the Indenture.

8.   Registration Rights Agreement

         The Holder of this Note is entitled to the benefits of a Registration
Rights Agreement, dated as of May 21, 2003, among the Company, the Guarantors
and the Initial Purchasers named therein (as such may be amended from time to
time, the "Registration Rights Agreement"). Capitalized terms used in this
subsection but not defined herein have the meanings assigned to them in the
Registration Rights Agreement.

         If (i) within 60 days after the Issue Date, neither the Exchange Offer
Registration Statement nor the Shelf Registration Statement has been filed with
the Commission; (ii) within 120 days after the Issue Date, the Exchange Offer
Registration Statement or the Shelf Registration Statement, as applicable, has
not been declared effective; (iii) within 150 days after the Issue Date, the
Exchange Offer has not been consummated; or (iv) after either the Exchange Offer
Registration Statement or the Shelf Registration Statement has been declared
effective, such Registration Statement thereafter ceases to be effective or
usable (subject, in the case of the Shelf Registration Statement, to the
exceptions set forth in the Registration Rights Agreement) in connection with
resales of Initial Notes or Exchange Notes in accordance with and during the
periods specified in Sections 2 and 3 of the Registration Rights Agreement (each
such event referred to in clauses (i) through (iv), a "Registration Default"),
liquidated damages ("Liquidated Damages") will accrue on the Initial Notes and
the Exchange Notes from and including the date on which any such Registration
Default shall occur to but excluding the date on which all Registration Defaults
have been cured. Liquidated Damages will accrue at a rate equal to 0.25% per
annum of the aggregate principal amount of the Notes during the 90-day period
immediately following the occurrence of any Registration Default and shall
increase by 0.25% per annum for each subsequent 90-day period during which such
Registration Default continues, but in no event shall such Liquidated Damages
exceed 1.00% per annum.

                                      A-5



9.   Denominations; Transfer; Exchange

         The Notes are in registered form, without coupons, and in denominations
of $1,000 and integral multiples of $1,000. A Holder may transfer or exchange
Notes in accordance with the Indenture. The Registrar may require a Holder,
among other things, to furnish appropriate endorsements or transfer documents
and to pay any taxes and fees required by law or permitted by the Indenture,
including any transfer tax or other similar governmental charge payable in
connection therewith. The Registrar need not register the transfer of or
exchange any Notes selected for redemption (except, in the case of a Note to be
redeemed in part, the portion of the Note not to be redeemed) or any Notes for a
period of 15 days before a selection of Notes to be redeemed or 15 days before
an interest payment date.

10.  Persons Deemed Owners

         The registered Holder of this Note may be treated as the owner of it
for all purposes.

11.  Unclaimed Money

         If money for the payment of principal or interest remains unclaimed for
two years, the Trustee or Paying Agent shall pay the money back to the Company
at its written request unless an abandoned property law designates another
Person. After any such payment, Holders entitled to the money must look only to
the Company and not to the Trustee for payment.

12.  Discharge and Defeasance

         Subject to certain conditions, the Company at any time may terminate
some or all of its obligations under the Notes and the Indenture if the Company
deposits with the Trustee money or U.S. Government Obligations for the payment
of principal and interest on the Notes to redemption or maturity, as the case
may be.

13.  Amendment, Waiver

         Subject to certain exceptions set forth in the Indenture, (i) the
Indenture or the Notes may be amended with the consent of the Holders of at
least a majority in principal amount outstanding of the Notes and (ii) any past
default or noncompliance with any provision may be waived with the consent of
the Holders of a majority in principal amount outstanding of the Notes. Subject
to certain exceptions set forth in the Indenture, without the consent of any
Holder, the Company, the Guarantors and the Trustee may amend the Indenture or
the Notes to cure any ambiguity, defect or inconsistency, to comply with Article
5 of the Indenture, to provide for uncertificated Notes in addition to or in
place of certificated Notes, to add Guarantees with respect to the Notes, to
release Guarantors when permitted by the Indenture and the Security Documents,
to add any additional asset as Collateral, to add additional covenants or
surrender rights and powers conferred on the Company, to make any change that
does not adversely affect the rights of any Holder or to comply with any request
of the SEC in connection with qualifying the Indenture under the TIA.

                                      A-6



14.  Defaults and Remedies

         If an Event of Default occurs and is continuing, the Trustee or the
Holders of at least 25% in principal amount of the Notes then outstanding may
declare all the Notes to be due and payable. Certain events of bankruptcy or
insolvency are Events of Default which will result in the Notes being due and
payable immediately upon the occurrence of such Events of Default.

         Holders may not enforce the Indenture or the Notes except as provided
in the Indenture. The Trustee may refuse to enforce the Indenture or the Notes
unless it is offered reasonable indemnity or security. Subject to certain
limitations, Holders of a majority in principal amount of the Notes may direct
the Trustee in its exercise of any trust or power. The Trustee may withhold from
Holders notice of any continuing Default (except a Default in payment of
principal or interest) if and so long as a committee of its trust officers
determines that withholding notice is in the interest of the Holders.

15.  Trustee Dealings with the Company

         Subject to certain limitations imposed by the TIA, the Trustee under
the Indenture, in its individual or any other capacity, may become the owner or
pledgee of Notes and may otherwise deal with and collect obligations owed to it
by the Company or any of its Affiliates and may otherwise deal with the Company
or any of its Affiliates with the same rights it would have if it were not
Trustee.

16.  No Recourse Against Others

         No recourse for the payment of the principal of, premium, if any, or
interest on any of the Notes or for any claim based thereon or otherwise in
respect thereof, and no recourse under or upon any obligation, covenant or
agreement of the Company or any Guarantor in the Indenture, or in any of the
Notes or Guarantees or because of the creation of any Indebtedness represented
hereby and thereby, shall be had against any incorporator, stockholder, officer,
director, employee, agent or controlling person of the Company or any of its
Subsidiaries. Each Holder, by accepting a Note, waives and releases all such
liability.

17.  Guarantees

         This Note will be entitled to the benefits of certain Guarantees, if
any, made for the benefit of the Holders. Reference is hereby made to the
Indenture for a statement of the respective rights, limitations of rights,
duties and obligations thereunder of the Guarantors, the Trustee and the
Holders.

18.  Security Documents

         In order to secure the due and punctual payment of the principal of and
interest on the Securities and all other amounts payable by the Issuer and the
Guarantors under the Indenture and the Notes when and as the same shall be due
and payable, whether at maturity, by acceleration or otherwise, according to the
terms of the Notes and the Indenture, the Pledgors have granted Liens on the
Collateral to the Trustee for the benefit of the Trustee and the Holders of
Notes pursuant to the Indenture and the Security Documents.

                                      A-7



         Each Holder, by accepting a Note, agrees to all of the terms and
provisions of the Security Documents as the same may be amended from time to
time pursuant to the respective provisions thereof and the Indenture.

         The Trustee and each Holder acknowledge that a release of any of the
Collateral or any Lien strictly in accordance with the terms and provisions of
any of the Security Documents and the terms and provisions of the Indenture will
not be deemed for any purpose to be an impairment of the security under the
Indenture.

19.  Governing Law

         The Indenture and the Notes shall be governed by, and construed in
accordance with, the laws of the State of New York without giving effect to
applicable principles of conflict of laws to the extent that the application of
the laws of another jurisdiction would be required thereby.

20.  Authentication

         This Note shall not be valid until an authorized signatory of the
Trustee (or an authenticating agent) manually signs the certificate of
authentication on the other side of this Security.

21.  Abbreviations

         Customary abbreviations may be used in the name of a Holder or an
assignee, such as TEN COM (= tenants in common), TEN ENT (= tenants by the
entireties), JT TEN (= joint tenants with rights of survivorship and not as
tenants in common), CUST (= custodian), and U/G/M/A (= Uniform Gift to Minors
Act).

22.  CUSIP Numbers

         Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures the Company has caused CUSIP numbers to be
printed on the Notes and has directed the Trustee to use CUSIP numbers in
notices of redemption as a convenience to Holders. No representation is made as
to the accuracy of such numbers either as printed on the Notes or as contained
in any notice of redemption and reliance may be placed only on the other
identification numbers placed thereon.

         The Company will furnish to any Holder upon written request and without
charge to the Holder a copy of the Indenture. Requests may be made as follows:

         TERRA CAPITAL, INC.
         Terra Centre
         600 Fourth Street
         P.O. Box 6000
         Sioux City, Iowa 51102
         Attention: Chief Financial Officer

                                      A-8



                                 ASSIGNMENT FORM

         To assign this Note, fill in the form below:

         I or we assign and transfer this Note to

________________________________________________________________________________
              (Print or type assignee's name, address and zip code)

________________________________________________________________________________
                  (Insert assignee's soc. sec. or tax I.D. No.)

and irrevocably appoint __________ agent to transfer this Note on the books of
the Company. The agent may substitute another to act for him.


Date:  _______________           Your Signature:________________________________
                                 (Sign exactly as your name appears on the other
                                 side of the Note)


                            Signature Guarantee:________________________________
                                                 (Signature must be guaranteed)

                               SIGNATURE GUARANTEE

         Signatures must be guaranteed by an "eligible guarantor institution"
meeting the requirements of the Registrar, which requirements include membership
or participation in the Security Transfer Agent Medallion Program ("STAMP") or
such other "signature guarantee program" as may be determined by the Registrar
in addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

         In connection with any transfer of this Note occurring prior to the
date which is the earlier of (i) the date of the declaration by the Commission
of the effectiveness of a registration statement under the Securities Act of
1933, as amended (the "Securities Act") covering resales of this Security (which
effectiveness shall not have been suspended or terminated at the date of the
transfer) and (ii) two years from the Issue Date, the undersigned confirms that
it has not utilized any general solicitation or general advertising in
connection with the transfer:

                                   [Check One]

(1) __  to the Company or a subsidiary thereof; or

(2) __  pursuant to and in compliance with Rule 144A under the Securities Act
        of 1933, as amended; or

                                      A-9



(3)  __   to an institutional "accredited investor" (as defined in Rule
          501(a)(1), (2), (3) or (7) under the Securities Act of 1933, as
          amended) that has furnished to the Trustee a signed letter
          containing certain representations and agreements (the form of
          which letter can be obtained from the Trustee); or

(4)  __   outside the United States to a "foreign person" in compliance with
          Rule 904 of Regulation S under the Securities Act of 1933, as amended;
          or

(5)  __   pursuant to the exemption from registration provided by Rule 144 under
          the Securities Act of 1933, as amended; or

(6)  __   pursuant to an effective registration statement under the Securities
          Act of 1933, as amended; or

(7)  __   pursuant to another available exemption from the registration
          requirements of the Securities Act of 1933, as amended;

and unless the box below is checked, the undersigned confirms that such Note is
not being transferred to an "affiliate" of the Company as defined in Rule 144
under the Securities Act of 1933, as amended (an "Affiliate"):

                                      A-10



          [_]    The transferee is an Affiliate of the Company.

          Unless one of the items is checked, the Trustee will refuse to
register any of the Securities evidenced by this certificate in the name of any
person other than the registered Holder thereof; provided, however, that if item
(3), (4), (5) or (7) is checked, the Company or the Trustee may require, prior
to registering any such transfer of the Securities, in their sole discretion,
such written legal opinions, certifications (including an investment letter in
the case of box (3) or (4)) and other information as the Trustee or the Company
has reasonably requested to confirm that such transfer is being made pursuant to
an exemption from, or in a transaction not subject to, the registration
requirements of the Securities Act of 1933, as amended.

          If none of the foregoing items are checked, the Trustee or Registrar
shall not be obligated to register this Security in the name of any person other
than the Holder hereof unless and until the conditions to any such transfer of
registration set forth herein and in Section 2.14 of the Indenture shall have
been satisfied.

Dated: ____________________             Signed: ________________________________
                                                (Sign exactly as name appears on
                                                the other side of this Note)


Signature Guarantee: ______________________________
                     (SIGNATURE MUST BE GUARANTEED)


                               SIGNATURE GUARANTEE

          Signatures must be guaranteed by an "eligible guarantor institution"
meeting the requirements of the Registrar, which requirements include membership
or participation in the Security Transfer Agent Medallion Program ("STAMP") or
such other "signature guarantee program" as may be determined by the Registrar
in addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

                                      A-11



              TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED

          The undersigned represents and warrants that it is purchasing this
Note for its own account or an account with respect to which it exercises sole
investment discretion and that it and any such account is a "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act of
1933, as amended, and is aware that the sale to it is being made in reliance on
Rule 144A and acknowledges that it has received such information regarding the
Company as the undersigned has requested pursuant to Rule 144A or has determined
not to request such information and that it is aware that the transferor is
relying upon the undersigned's foregoing representations in order to claim the
exemption from registration provided by Rule 144A.

Dated: ______________           ________________________________________________
                                NOTICE: To be executed by an executive officer

                                      A-12



                       OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Note purchased by the Company
pursuant to Section 4.8, 4.13 or 4.15 of the Indenture, check the box: [_]

          If you want to elect to have only part of this Note purchased by the
Company pursuant to Section 4.8, 4.13 or 4.15 of the Indenture, state the
amount: $

Date: ______________                   Your Signature: _________________________
                                       (Sign exactly as your name appears on the
                                       other side of the Note)


Signature Guarantee:                  __________________________________________
                                      (Signature must be guaranteed)


                               SIGNATURE GUARANTEE

          Signatures must be guaranteed by an "eligible guarantor institution"
meeting the requirements of the Registrar, which requirements include membership
or participation in the Security Transfer Agent Medallion Program ("STAMP") or
such other "signature guarantee program" as may be determined by the Registrar
in addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

                                      A-13



                                                                       EXHIBIT B

                                 [FACE OF NOTE]

No.                                                           CUSIP No.

                               TERRA CAPITAL, INC.

             11 1/2% Second Priority Senior Secured Notes Due 2010,

          TERRA CAPITAL, INC., a Delaware corporation (the "Company"), promises
to pay to Cede & Co., or registered assigns, the principal sum of
($       ) Dollars on         , 2008.

          Interest Payment Dates: June 1 and December 1.

          Record Dates: May 15 and November 15.

          Additional provisions of this Note are set forth on the reverse side
of this Security.

          IN WITNESS WHEREOF, the Company has caused this Note to be signed
manually or by facsimile by a duly authorized officer.

                                           TERRA CAPITAL, INC.

                                           By:    ______________________________
                                                  Name:
                                                  Title:

Dated:

                                       B-1



                            TRUSTEE'S CERTIFICATE OF
                                 AUTHENTICATION

          U.S. Bank National Association, as Trustee, certifies that this is one
of the Notes referred to in the within-mentioned Indenture.

                                               U.S. BANK NATIONAL ASSOCIATION,
                                                 as Trustee

                                               By:  ____________________________
                                                    Authorized Signatory


Date of Authentication:

                                       B-2



                                 REVERSE OF NOTE

              11 1/2% SECOND PRIORITY SENIOR SECURED NOTES DUE 2010

1.   Interest

               TERRA CAPITAL, INC., a Delaware corporation (such entity, and its
successors and assigns under the Indenture, the "Company"), promises to pay
interest on the principal amount of this Note at the rate per annum shown above.
The Company will pay interest semiannually on June 1 and December 1 of each
year, commencing December 1, 2003. Interest on the Notes will accrue from the
most recent date on which interest has been paid or, if no interest has been
paid, from May 21, 2003. Interest will be computed on the basis of a 360-day
year of twelve 30-day months. The Company shall pay interest on overdue
principal at 1% per annum in excess of the rate borne by the Notes, and it shall
pay interest on overdue installments of interest at the same rate to the extent
lawful.

2.   Method of Payment

               The Company will pay interest on the Notes (except defaulted
interest) to the Persons who are registered holders of Notes at the close of
business on the record date immediately preceding the interest payment date even
if Notes are canceled on registration of transfer or registration of exchange
(including pursuant to an Exchange Offer (as defined in the Registration Rights
Agreement)) after the record date. Holders must surrender Notes to a Paying
Agent to collect principal payments. The Company will pay principal and interest
in money of the United States that at the time of payment is legal tender for
payment of public and private debts ("U.S. Legal Tender"). However, the Company
may pay principal and interest by its check payable in such U.S. Legal Tender.
The Company may deliver any such interest payment to the Paying Agent or to a
Holder's registered address.

3.   Paying Agent and Registrar

               Initially, U.S. Bank National Association, a national banking
corporation (the "Trustee"), will act as Paying Agent and Registrar. The Company
may appoint and change any Paying Agent, Registrar or co-registrar without
notice. The Company may act as Paying Agent, Registrar, co-Registrar or transfer
agent.

4.   Indenture

               The Company issued the Securities under an Indenture dated as of
May 21, 2003 (the "Indenture"), among the Company, the Guarantors party thereto
and the Trustee. This Note is one of a duly authorized issue of Exchange Notes
of the Company designated as its 11 1/2% Second Priority Senior Secured Notes
due 2010 (the "Exchange Notes"). The Notes include the Initial Notes (as defined
in the Indenture) and the Exchange Notes issued in exchange for the Initial
Notes pursuant to the Registration Rights Agreement. The Initial Notes and the
Exchange Notes are treated as a single class of securities under the Indenture.
The terms of the Notes include those stated in the Indenture and those made part
of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C. (S)
77aaa-77bbbb) as in effect on the date of the Indenture (the "TIA"). Terms
defined in the Indenture and not defined herein have the meanings ascribed
thereto in the Indenture. The Notes are subject to all such terms, and Holders
are referred to the Indenture and the TIA for a statement of those terms. Any
conflict between this Note and the Indenture will be governed by the Indenture.

                                      B-3



               The Notes are senior secured obligations of the Company limited
to $202,000,000 aggregate principal amount (subject to Section 2.7 of the
Indenture). The Indenture imposes certain limitations on the ability of Parent
and its Restricted Subsidiaries to incur Indebtedness, create Liens, pay
dividends on or repurchase Capital Stock of Parent and its Affiliates, make
Restrictive Payments, make investments, sell Assets, enter into transactions
with Affiliates, limit dividends or other distributions from Restricted
Subsidiaries, impair Security Interest, enter into Sale and Leaseback
Transactions, engage in other businesses or merge, consolidate or transfer all
or substantially all of the assets of Parent and its Restricted Subsidiaries.

               To guarantee the due and punctual payment of the principal,
premium and interest, if any, on the Notes and all other amounts payable by the
Company under the Indenture and the Notes when and as the same shall be due and
payable, whether at maturity, by acceleration or otherwise, according to the
terms of the Notes and the Indenture, the Guarantors have unconditionally
guaranteed the obligations of the Company under the Indenture and the Notes on a
senior secured basis pursuant to the terms of the Indenture.

5.   Optional Redemption

               (a)   Prior to June 1, 2007 the Notes will be redeemable, in
whole at any time or in part from time to time, at the option of Issuer, upon
not less than 30 nor more than 60 days' notice, at a redemption price equal to
the sum of (x) 100% of the principal amount thereof, plus accrued and unpaid
interest, if any, thereon to the redemption date, plus (y) the Make Whole
Amount, if any.

               (b)   Thereafter, the Notes will be redeemable at the option of
Issuer, in whole or in part, at any time after June 1, 2007, at the redemption
prices (expressed as a percentage of principal amount) set forth below, plus
accrued and unpaid interest thereon, if any, to the redemption date (subject to
the right of holders of record on the relevant record date to receive interest
due on the relevant interest payment date), if redeemed during the twelve-month
period beginning on June 1 of the years indicated below:

                                                                   Redemption
         Year                                                        Price
         ----                                                      ----------
         2007 ................................................      105.750%
         2008 ................................................      102.875%
         2009 and thereafter .................................      100.000%

               (c)   Notwithstanding the foregoing, at any time on or prior to
June 1, 2006, Issuer may at its option on any one or more occasions redeem Notes
in an aggregate principal amount not to exceed 35% of the aggregate principal
amount of Notes issued under the Indenture at a redemption price of 111.50% of
the principal amount, plus accrued and unpaid interest to the redemption date,
with the net cash proceeds of one or more Equity Offerings; provided that (1) at
least 65% of the aggregate principal amount of Notes issued under the Indenture
remains outstanding immediately after the occurrence of such redemption
(excluding Notes held by Parent and its Subsidiaries); and (2) the redemption
occurs within 90 days of the date of the closing of such Equity Offering.

                                      B-4



6.   Notice of Redemption

               Notice of redemption will be mailed by first-class mail at least
30 days but not more than 60 days before the redemption date to each Holder of
Notes to be redeemed at his registered address. Notes in denominations larger
than $1,000 may be redeemed in part but only in whole multiples of $1,000. If
money sufficient to pay the redemption price of and accrued interest on all
Notes (or portions thereof) to be redeemed on the redemption date is deposited
with the Paying Agent on or before the redemption date and certain other
conditions are satisfied, on and after such date interest ceases to accrue on
such Notes (or such portions thereof) called for redemption. If a notice or
communication is sent in the manner provided in the Indenture, it is duly given,
whether or not the addressee receives it. Failure to send a notice or
communication to a Holder or any defect in it shall not affect its sufficiency
with respect to other Holders.

7.   Change of Control

               Upon a Change of Control, each Holder of Notes will have the
right to require the Company to purchase all or any part (equal to $1,000 or an
integral multiple thereof) of the Notes of such Holder at a purchase price in
cash equal to 101% of the principal amount of the Notes to be purchased plus
accrued and unpaid interest, if any, to the date of purchase (subject to the
right of Holders of record on the relevant record date to receive interest due
on an interest payment date that is on or prior to the date fixed for
redemption) as provided in, and subject to the terms of, the Indenture.

8.   Denominations; Transfer; Exchange

               The Notes are in registered form, without coupons, and in
denominations of $1,000 and integral multiples of $1,000. A Holder may transfer
or exchange Notes in accordance with the Indenture. The Registrar may require a
Holder, among other things, to furnish appropriate endorsements or transfer
documents and to pay any taxes and fees required by law or permitted by the
Indenture, including any transfer tax or other similar governmental charge
payable in connection therewith. The Registrar need not register the transfer of
or exchange any Notes selected for redemption (except, in the case of a Note to
be redeemed in part, the portion of the Note not to be redeemed) or any Notes
for a period of 15 days before a selection of Notes to be redeemed or 15 days
before an interest payment date.

9.   Persons Deemed Owners

               The registered Holder of this Note may be treated as the owner of
it for all purposes.

10.  Unclaimed Money

               If money for the payment of principal or interest remains
unclaimed for two years, the Trustee or Paying Agent shall pay the money back to
the Company at its written request unless an abandoned property law designates
another Person. After any such payment, Holders entitled to the money must look
only to the Company and not to the Trustee for payment.

                                      B-5



11.   Discharge and Defeasance

               Subject to certain conditions, the Company at any time may
terminate some or all of its obligations under the Notes and the Indenture if
the Company deposits with the Trustee money or U.S. Government Obligations for
the payment of principal and interest on the Notes to redemption or maturity, as
the case may be.

12.   Amendment, Waiver

               Subject to certain exceptions set forth in the Indenture, (i) the
Indenture or the Notes may be amended with the consent of the Holders of at
least a majority in principal amount outstanding of the Notes and (ii) any past
default or noncompliance with any provision may be waived with the consent of
the Holders of a majority in principal amount outstanding of the Notes. Subject
to certain exceptions set forth in the Indenture, without the consent of any
Holder, the Company, the Guarantors and the Trustee may amend the Indenture or
the Notes to cure any ambiguity, defect or inconsistency, to comply with Article
5 of the Indenture, to provide for uncertificated Notes in addition to or in
place of certificated Notes, to add Guarantees with respect to the Notes, to
release Guarantors when permitted by the Indenture and the Security Documents,
to add any additional asset as Collateral, to add additional covenants or
surrender rights and powers conferred on the Company, to make any change that
does not adversely affect the rights of any Holder or to comply with any request
of the SEC in connection with qualifying the Indenture under the TIA.

13.   Defaults and Remedies

               If an Event of Default occurs and is continuing, the Trustee or
the Holders of at least 25% in principal amount of the Notes then outstanding
may declare all the Notes to be due and payable. Certain events of bankruptcy or
insolvency are Events of Default which will result in the Notes being due and
payable immediately upon the occurrence of such Events of Default.

               Holders may not enforce the Indenture or the Notes except as
provided in the Indenture. The Trustee may refuse to enforce the Indenture or
the Notes unless it is offered reasonable indemnity or security. Subject to
certain limitations, Holders of a majority in principal amount of the Notes may
direct the Trustee in its exercise of any trust or power. The Trustee may
withhold from Holders notice of any continuing Default (except a Default in
payment of principal or interest) if and so long as a committee of its trust
officers determines that withholding notice is in the interest of the Holders.

14.   Trustee Dealings with the Company

               Subject to certain limitations imposed by the TIA, the Trustee
under the Indenture, in its individual or any other capacity, may become the
owner or pledgee of Notes and may otherwise deal with and collect obligations
owed to it by the Company or any of its Affiliates and may otherwise deal with
the Company or any of its Affiliates with the same rights it would have if it
were not Trustee.

                                      B-6



15.   No Recourse Against Others

               No recourse for the payment of the principal of, premium, if any,
or interest on any of the Notes or for any claim based thereon or otherwise in
respect thereof, and no recourse under or upon any obligation, covenant or
agreement of the Company or any Guarantor in the Indenture, or in any of the
Notes or Guarantees or because of the creation of any Indebtedness represented
hereby and thereby, shall be had against any incorporator, stockholder, officer,
director, employee, agent or controlling person of the Company or any of its
Subsidiaries. Each Holder, by accepting a Note, waives and releases all such
liability.

16.   Guarantees

               This Note will be entitled to the benefits of certain Guarantees,
if any, made for the benefit of the Holders. Reference is hereby made to the
Indenture for a statement of the respective rights, limitations of rights,
duties and obligations thereunder of the Guarantors, the Trustee and the
Holders.

17.   Security Documents

               In order to secure the due and punctual payment of the principal
of and interest on the Securities and all other amounts payable by the Issuer
and the Guarantors under the Indenture and the Notes when and at the same time
shall be due and payable, whether at maturity, by acceleration or otherwise,
according to the terms of the Notes and the Indenture, the Pledgors have granted
Liens on the Collateral to the Trustee for the benefit of the Trustee and the
Holders of Notes pursuant to the Indenture and the Security Documents.

               Each Holder, by accepting a Note, agrees to all of the terms and
provisions of the Security Documents as the same may be amended from time to
time pursuant to the respective provisions thereof and the Indenture.

               The Trustee and each Holder acknowledge that a release of any of
the Collateral or any Lien strictly in accordance with the terms and provisions
of any of the Security Documents and the terms and provisions of the Indenture
will not be deemed for any purpose to be an impairment of the security under the
Indenture.

18.   Governing Law

               The Indenture and the Notes shall be governed by, and construed
in accordance with, the laws of the State of New York without giving effect to
applicable principles of conflict of laws to the extent that the application of
the laws of another jurisdiction would be required thereby.

19.   Authentication

               This Note shall not be valid until an authorized signatory of the
Trustee (or an authenticating agent) manually signs the certificate of
authentication on the other side of this Security.

                                      B-7



20.   Abbreviations

               Customary abbreviations may be used in the name of a Holder or an
assignee, such as TEN COM (= tenants in common), TEN ENT (= tenants by the
entireties), JT TEN (= joint tenants with rights of survivorship and not as
tenants in common), CUST (= custodian), and U/G/M/A (= Uniform Gift to Minors
Act).

21.   CUSIP Numbers

               Pursuant to a recommendation promulgated by the Committee on
Uniform Security Identification Procedures the Company has caused CUSIP numbers
to be printed on the Notes and has directed the Trustee to use CUSIP numbers in
notices of redemption as a convenience to Holders. No representation is made as
to the accuracy of such numbers either as printed on the Notes or as contained
in any notice of redemption and reliance may be placed only on the other
identification numbers placed thereon.

               The Company will furnish to any Holder upon written request and
without charge to the Holder a copy of the Indenture. Requests may be made as
follows:

               TERRA CAPITAL, INC.
               Terra Centre
               600 Fourth Street
               P.O. Box 6000
               Sioux City, Iowa  51102
               Attention:  Chief Financial Officer

                                      B-8



                                 ASSIGNMENT FORM

          To assign this Note, fill in the form below:

          I or we assign and transfer this Note to

________________________________________________________________________________
              (Print or type assignee's name, address and zip code)

________________________________________________________________________________
                  (Insert assignee's soc. sec. or tax I.D. No.)

and irrevocably appoint __________ agent to transfer this Note on the books of
the Company. The agent may substitute another to act for him.

Date: _______________                  Your Signature: _________________________
                                       (Sign exactly as your name appears on the
                                       other side of this Note.)

                             Signature Guarantee: ______________________________
                                                  (Signature must be guaranteed)

                               SIGNATURE GUARANTEE

          Signatures must be guaranteed by an "eligible guarantor institution"
meeting the requirements of the Registrar, which requirements include membership
or participation in the Security Transfer Agent Medallion Program ("STAMP") or
such other "signature guarantee program" as may be determined by the Registrar
in addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

                                      B-9



                       OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Note purchased by the Company
pursuant to Section 4.8, 4.13 or 4.15 of the Indenture, check the box: [_]

          If you want to elect to have only part of this Note purchased by the
Company pursuant to Section 4.8, 4.13 or 4.15 of the Indenture, state the
amount: $

Date: ______________                      Your Signature: ______________________
                                          (Sign exactly as your name appears on
                                          the other side of the Note)

Signature Guarantee:
                                 _______________________________________________
                                 (Signature must be guaranteed)

                               SIGNATURE GUARANTEE

          Signatures must be guaranteed by an "eligible guarantor institution"
meeting the requirements of the Registrar, which requirements include membership
or participation in the Security Transfer Agent Medallion Program ("STAMP") or
such other "signature guarantee program" as may be determined by the Registrar
in addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

                                      B-10



                                                                       EXHIBIT C

                            Form of Certificate To Be
                          Delivered in Connection with
                    Transfers to Non-QIB Accredited Investors

                                                                 [      ], [   ]

U.S. Bank National Association
180 East 5th Street
St. Paul, Minnesota 55101

Ladies and Gentlemen:

          In connection with our proposed purchase of 11 1/2% Second Priority
Senior Secured Notes due 2010 (the "Securities") of TERRA CAPITAL, INC., a
Delaware corporation (the "Company"), we confirm that:

          1. We have received a copy of the Offering Memorandum (the "Offering
     Memorandum"), dated May 16, 2003, relating to the Securities and such other
     information as we deem necessary in order to make our investment decision.
     We acknowledge that we have read and agreed to the matters stated in the
     section entitled "Notice to Investors" of such Offering Memorandum.

          2. We understand that any subsequent transfer of the Securities is
     subject to certain restrictions and conditions set forth in the Indenture
     relating to the Securities (the "Indenture") as described in the Offering
     Memorandum and the undersigned agrees to be bound by, and not to resell,
     pledge or otherwise transfer the Securities except in compliance with, such
     restrictions and conditions and the Securities Act of 1933, as amended (the
     "Securities Act"), and all applicable State securities laws.

          3. We understand that the offer and sale of the Securities have not
     been registered under the Securities Act, and that the Securities may not
     be offered or sold within the United States or to, or for the account or
     benefit of, U.S. persons except as permitted in the following sentence. We
     agree, on our own behalf and on behalf of any accounts for which we are
     acting as hereinafter stated, that if we should sell any Securities, we
     will do so only (i) to the Company or any subsidiary thereof, (ii) inside
     the United States in accordance with Rule 144A under the Securities Act to
     a "qualified institutional buyer" (as defined in Rule 144A promulgated
     under the Securities Act), (iii) inside the United States to an
     institutional "accredited investor" (as defined below) that, prior to such
     transfer, furnishes (or has furnished on its behalf by a U.S.
     broker-dealer) to the Trustee (as defined in the Indenture) a signed letter
     containing certain representations and agreements relating to the
     restrictions on transfer of the Securities (the form of which letter can be
     obtained from the Trustee), (iv) outside the United States in accordance
     with Rule 904 of Regulation S promulgated under the Securities Act to
     non-U.S. persons, (v) pursuant to the exemption from registration provided
     by Rule 144 under the Securities Act (if available), or (vi) pursuant to an
     effective registration statement under

                                      C-1



     the Securities Act, and we further agree to provide to any person
     purchasing any of the Securities from us a notice advising such purchaser
     that resales of the Securities are restricted as stated herein.

          4. We understand that, on any proposed resale of any Securities, we
     will be required to furnish to the Trustee and the Company such
     certification, legal opinions and other information as the Trustee and the
     Company may reasonably require to confirm that the proposed sale complies
     with the foregoing restrictions. We further understand that the Securities
     purchased by us will bear a legend to the foregoing effect.

          5. We are an institutional "accredited investor" (as defined in Rule
     501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and
     have such knowledge and experience in financial and business matters as to
     be capable of evaluating the merits and risks of our investment in the
     Securities, and we and any accounts for which we are acting are each able
     to bear the economic risk of our or their investment, as the case may be.

          6. We are acquiring the Securities purchased by us for our account or
     for one or more accounts (each of which is an institutional "accredited
     investor") as to each of which we exercise sole investment discretion.

                                      C-2



          You, the Company, the Trustee and others are entitled to rely upon
this letter and are irrevocably authorized to produce this letter or a copy
hereof to any interested party in any administrative or legal proceeding or
official inquiry with respect to the matters covered hereby.

                                            Very truly yours,

                                            [Name of Transferee]

                                            By: ________________________________
                                                Name:
                                                Title:

                                      C-3



                                                                       EXHIBIT D

                       Form of Certificate To Be Delivered
                          in Connection with Transfers
                            Pursuant to Regulation S

                                                                     [    ], [ ]

U.S. Bank National Association
180 East 5th Street
St. Paul, Minnesota 55101


                           Re:  TERRA CAPITAL, INC. (the "Company")
                                11 1/2% Second Priority Senior Secured Notes
                                due 2010 (the "Securities")

Ladies and Gentlemen:

          In connection with our proposed sale of $202,000,000 aggregate
principal amount of the Securities, we confirm that such sale has been effected
pursuant to and in accordance with Regulation S under the U.S. Securities Act of
1933, as amended (the "Securities Act"), and, accordingly, we represent that:

          (1)  the offer of the Securities was not made to a person in the
     United States;

          (2)  either (a) at the time the buy offer was originated, the
     transferee was outside the United States or we and any person acting on our
     behalf reasonably believed that the transferee was outside the United
     States, or (b) the transaction was executed in, on or through the
     facilities of a designated off-shore securities market and neither we nor
     any person acting on our behalf knows that the transaction has been
     pre-arranged with a buyer in the United States;

          (3)  no directed selling efforts have been made in the United States
     in contravention of the requirements of Rule 903(b) or Rule 904(b) of
     Regulation S, as applicable;

          (4)  the transaction is not part of a plan or scheme to evade the
     registration requirements of the Securities Act; and

          (5)  we have advised the transferee of the transfer restrictions
     applicable to the Securities.

                                       D-1



     You, the Company and counsel for the Company are entitled to rely upon this
letter and are irrevocably authorized to produce this letter or a copy hereof to
any interested party in any administrative or legal proceedings or official
inquiry with respect to the matters covered hereby. Terms used in this
certificate have the meanings set forth in Regulation S.

                                             Very truly yours,

                                             [Name of Transferor]


                                             By: _______________________________
                                                 Authorized Signature

                                      D-2



                                                                       EXHIBIT E

                                    GUARANTEE

     For value received, the undersigned hereby unconditionally guarantees, as
principal obligor and not only as a surety, to the Holder of this Note the cash
payments in United States dollars of principal of and interest on this Note in
the amounts and at the times when due and interest on the overdue principal of
and interest on this Note, if lawful, and the payment or performance of all
other obligations of the Company (as defined below) under the Indenture (as
defined below) or the Notes, to the Holder of this Note and the Trustee (as
defined below), all in accordance with and subject to the terms and limitations
of this Note, Article 10 of the Indenture and this Guarantee. This Guarantee
will become effective in accordance with Article 10 of the Indenture and its
terms shall be evidenced therein. The validity and enforceability of any
Guarantee shall not be affected by the fact that it is not affixed to any
particular Note. Terms used but not defined herein shall have the meanings
ascribed to them in the Indenture dated as of May 21, 2003, among TERRA CAPITAL,
INC., a Delaware corporation, as the Company (the "Company"), the Guarantors
party thereto and U.S. Bank National Association, as trustee (the "Trustee"), as
amended or supplemented from time to time (the "Indenture").

     The obligations of the undersigned to the Holders of Notes and to the
Trustee pursuant to this Guarantee and the Indenture are expressly set forth in
Article 10 of the Indenture and reference is hereby made to the Indenture for
the precise terms of the Guarantee and all of the other provisions of the
Indenture to which this Guarantee relates.

     THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE STATE OF NEW YORK WITHOUT GIVING EFFECT TO PRINCIPLES OF CONFLICTS
OF LAW. Each Guarantor hereby agrees to submit to the jurisdiction of the courts
of the State of New York in any action or proceeding arising out of or relating
to this Guarantee.

     This Guarantee is subject to release upon the terms set forth in the
Indenture.

                                      E-1



     IN WITNESS WHEREOF, each Guarantor has caused its Guarantee to be duly
executed.

                                        BEAUMONT AMMONIA INC.
                                        BEAUMONT HOLDINGS CORPORATION
                                        BMC HOLDINGS INC.
                                        PORT NEAL CORPORATION
                                        TERRA CAPITAL HOLDINGS, INC.
                                        TERRA INDUSTRIES INC.
                                        TERRA INTERNATIONAL, INC.
                                        TERRA INTERNATIONAL (OKLAHOMA) INC.
                                        TERRA METHANOL CORPORATION
                                        TERRA NITROGEN CORPORATION
                                        TERRA REAL ESTATE CORP.
                                        TERRA (U.K.) HOLDINGS INC.


                                        By: ____________________________________
                                            Name:
                                            Title:

                                      E-2



                                                                       EXHIBIT F

                         FORM OF SUPPLEMENTAL INDENTURE

     SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of
_______________.

     WHEREAS Terra Capital, Inc. (the "Company"), Terra Industries Inc., a
Maryland corporation ("Parent"), certain of Parent's subsidiaries and U.S. Bank
National Association, as trustee, are parties to an Indenture (as such may be
amended from time to time, the "Indenture"), dated as of May 21, 2003, relating
to the Company's 11 1/2% Second Priority Senior Secured Notes due 2010 (the
"Notes");

     WHEREAS Section 4.5 of the Indenture requires the Company to cause each new
Restricted Subsidiary (other than any Foreign Subsidiary) to execute and deliver
to the Trustee a supplemental indenture pursuant to which such Restricted
Subsidiary shall unconditionally guarantee all of the Company's obligations
under the Indenture and the Notes.

     NOW, THEREFORE, for good and valuable consideration, the receipt of which
is acknowledged, the undersigned hereby agrees to guarantee the Company's
obligations under the Notes on the terms and subject to the conditions set forth
in Article 10 of the Indenture. From and after the date hereof, the undersigned
shall be a Guarantor for all purposes under the Indenture and the Notes.

                                      F-1



     IN WITNESS WHEREOF, the undersigned has caused this Supplemental Indenture
to be duly executed as of the date first above written.

                                            [NEW GUARANTOR]


                                            By: ________________________________
                                                Name:
                                                Title:

                                      F-2



                                                                       EXHIBIT I

                           FORM OF SECURITY AGREEMENT

                                      I-1