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                                                                    Exhibit 10.6

                      SUPPLEMENTAL RETIREMENT INCOME PLAN
                           FOR SALARIED EMPLOYEES OF
                            HELMERICH & PAYNE, INC.

        THE SUPPLEMENTAL RETIREMENT INCOME PLAN FOR SALARIED EMPLOYEES OF 
HELMERICH & PAYNE, INC. is hereby adopted under the following terms and 
conditions.

        NOW, THEREFORE, in consideration of the terms and provisions hereafter
set forth, the Company hereby adopts the Plan pursuant to the terms and 
provisions set forth below:

                                   ARTICLE I

                            NAME AND PURPOSE OF PLAN

        1.1      Name of Plan.  This Plan shall be hereafter known as THE 
SUPPLEMENTAL RETIREMENT INCOME PLAN FOR SALARIED EMPLOYEES OF HELMERICH & PAYNE,
INC.

        1.2      Purpose.  The Plan is established and maintained by Helmerich 
& Payne, Inc. solely for the purpose of providing benefits for certain of its 
salaried employees who participate in the Helmerich & Payne, Inc.  Employees 
Retirement Plan in excess of the limitations on benefits imposed by Sections 
415 and 401(a)(17) of the Internal Revenue Code of 1986, as amended, on 
qualified plans to which those Sections are applicable.

                                   ARTICLE II

                                  DEFINITIONS

        2.1      Definitions.  Where the following capitalized words and phrases
appear in this instrument, they shall have the respective meanings set forth 
below unless a different context is clearly expressed herein.

                 (a)     "Board" means the Board of Directors of the Company.

                 (b)     "Code" means the Internal Revenue Code of 1986, as 
amended from time to time, and any regulations relating thereto.

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                 (c)     "Company" means Helmerich & Payne, Inc., a Delaware 
corporation, or, to the extent provided in Section 8.8 below, any successor 
corporation or other entity resulting from a merger or consolidation into or 
with the Company or a transfer or sale of substantially all of the assets of 
the Company.

                 (d)     "Limitations on Benefits" means the limitations 
imposed by Sections 415 and 401(a)(17) of the Code on the accrual of the 
Qualified Plan Retirement Benefits under the Qualified Plan.

                 (e)     "Normal Retirement Date" means the first day of the 
month coinciding with or next following a Participant's 65th birthday.

                 (f)     "Participant" means (i) a key management salaried 
employee of the Company who is a participant under the Qualified Plan (or any 
successor or replacement retirement plan qualified under Section 401(a) and 
501(a) of the Code) and to whom or with respect to whom a benefit is payable 
under the Plan and (ii) who has been selected by the Board to participate in 
the Plan.  The initial participants are listed on Exhibit "A" attached hereto.

                 (g) "Plan" means this "Supplemental Retirement Income Plan for 
Salaried Employees of Helmerich & Payne, Inc."

                 (h)     "Qualified Plan" means the "Helmerich & Payne, Inc.  
Employees Retirement Plan" amended and restated effective October 1, 1987, and 
each predecessor, successor or replacement employees retirement plan qualified 
under Section 401(a) and 501(a) of the Code.

                 (i)     "Qualified Plan Retirement Benefit" means the aggregate
benefit payable at any point in time to a Participant pursuant to the Qualified
Plan and all annuities purchased for or benefits paid to the Participant under
all Qualified Plans (whether or not terminated) by reason of the Participant's 
termination of employment with the Company and all Subsidiaries for any reason
other than death.

                 (j)     "Qualified Plan Surviving Spouse Benefit" means the 
aggregate benefit payable at any point in time to the





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Surviving Spouse of a Participant pursuant to all Qualified Plans and all
annuities purchased for or benefits paid to the Participant under all Qualified
Plans (whether or not terminated) in the event of the death of the Participant
at any time prior to commencement of payment of his Qualified Plan Retirement
Benefit.

                 (k)     "Subsidiary" means any corporation with 80% or more 
of its voting common stock being owned by the Company.

                 (l)     "Supplemental Retirement Benefit" means the benefit 
payable to a Participant pursuant to the Plan by reason of such Participant's 
termination of employment with the Company and all Subsidiaries for any reason 
other than death.

                 (m)     "Supplemental Surviving Spouse Benefit" means the 
benefit payable to a Surviving Spouse pursuant to the Plan.

                 (n)     "Surviving Spouse" means a person who is married to a 
Participant at the date of his death and for at least one year prior thereto.

        2.2      Construction.  The masculine gender, where appearing in the 
Plan, shall be deemed to include the feminine gender, unless the context 
clearly indicates to the contrary.  Any word appearing herein in the plural
shall include the singular, where appropriate, and likewise the singular shall
include the plural, unless the context clearly indicates to the contrary.

                                  ARTICLE III

                                  ELIGIBILITY

        A Participant who is eligible to receive a Qualified Plan Retirement 
Benefit, but the amount of such benefit is reduced by reason of the application
of the Limitations on Benefits, as in effect on the date of commencement of the 
Qualified Plan Retirement Benefit, or as in effect at any time thereafter, 
shall be eligible to receive a Supplemental Retirement Benefit.  The Surviving 
Spouse of a Participant described in the preceding sentence who dies prior to 
commencement of payment of his Qualified Plan Retirement Benefit shall be 
eligible to receive a Supplemental Surviving Spouse Benefit.





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                                   ARTICLE IV

                        SUPPLEMENTAL RETIREMENT BENEFIT

        4.1      Amount.  The Supplemental Retirement Benefit payable to an 
eligible Participant shall (i) be in the form of a straight life annuity over 
the lifetime of the Participant only, (ii) be calculated as of the date of his 
termination of employment as if payment was to commence on such Participant's 
Normal Retirement Date, and (iii) be a monthly amount equal to the difference 
between (a) minus (b) below:

                 (a)     the monthly amount of the Qualified Plan Retirement 
Benefit to which the Participant would have been entitled under the Qualified 
Plan if such benefit were computed without giving effect to the Limitations on 
Benefits;

        Less

                 (b)     the monthly amount of the Qualified Plan Retirement 
Benefit actually payable to the Participant under the Qualified Plan at the 
applicable point in time.

        4.2      Form of Benefit.  The Supplemental Retirement Benefit payable 
to a Participant shall be paid in the same form under which the Qualified Plan 
Retirement Benefit is payable to the Participant.  The Participant's election 
under the Qualified Plan of any optional form of payment of his Qualified Plan 
Retirement Benefit (with the valid consent of his Surviving Spouse where 
required under the Qualified Plan) shall also be applicable to the payment of 
his Supplemental Retirement Benefit.

        4.3      Commencement of Benefit.  Payment of the Supplemental 
Retirement Benefit to a Participant shall commence on the same date as payment
of the Qualified Plan Retirement Benefit to the Participant commences.  Any
election under the Qualified Plan made by the Participant with respect to the
commencement of payment of his Qualified Plan Retirement Benefit shall also be
applicable with respect to the commencement of payment of his Supplemental
Retirement Benefit.

        4.4      Approval Of Company.  Notwithstanding the provisions of 
Sections 4.2 and 4.3 above, an election made by the





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Participant under the Qualified Plan with respect to the form of payment of his
Qualified Plan Retirement Benefit (with the valid consent of his Surviving
Spouse where required under the Qualified Plan), or the date for commencement
of payment thereof, shall not be effective with respect to the form of payment
or date for commencement of payment of his Supplemental Retirement Benefit
hereunder unless such election is expressly approved in writing by the Company
with respect to his Supplemental Retirement Benefit.  If the Company shall not
approve such election in writing, then, the form of payment or date for
commencement of payment of the Participant's Supplemental Retirement Benefit
shall be selected by the Company in its sole discretion.

        4.5      Actuarial Equivalent.  A Supplemental Retirement Benefit which 
is payable in any form other than straight life annuity over the lifetime of the
Participant, or which commences at any time prior to the Participant's Normal 
Retirement Date, shall be the actuarial equivalent of the Supplemental 
Retirement Benefit set forth in Section 4.1 above as determined by the same 
actuarial adjustments as those specified in the Qualified Plan with respect to 
determination of the amount of the Qualified Plan Retirement Benefit on the 
date for commencement of payment hereunder.

                                   ARTICLE V

                     SUPPLEMENTAL SURVIVING SPOUSE BENEFIT

        5.1.     Amount.  If a Participant dies prior to commencement of payment
of his Qualified Plan Retirement Benefit under circumstances in which a 
Qualified Plan Surviving Spouse Benefit is payable to his Surviving Spouse, 
then, a Supplemental Surviving Spouse Benefit is payable to his Surviving 
Spouse as hereinafter provided.  The monthly amount of the Supplemental 
Surviving Spouse Benefit payable to a Surviving Spouse shall be equal to the 
difference between (a) minus (b) below:

                 (a)     the monthly amount of the Qualified Plan Surviving 
Spouse Benefit to which the Surviving Spouse would have been entitled under the
Qualified Plan if such Benefit were computed without giving effect to the 
Limitations on Benefits;





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        Less

                 (b)     the monthly amount of the Qualified Plan Surviving 
Spouse Benefit actually payable to the Surviving Spouse under the Qualified 
Plan.

        5.2.     Form and Commencement of Benefit.  A Supplemental Surviving 
Spouse Benefit shall be payable over the lifetime of the Surviving Spouse only 
in monthly installments commencing on the date for commencement of payment of 
the Qualified Plan Surviving Spouse Benefit to the Surviving Spouse and 
terminating on the date of the last payment of the Qualified Plan Surviving
Spouse Benefit made before the Surviving Spouse's death.

                                   ARTICLE VI

                           ADMINISTRATION OF THE PLAN

        6.1.     Administration by the Company.  The Company shall be 
responsible for the general operation and administration of the Plan and for
carrying out the provisions thereof.

        6.2.     General Powers of Administration.  All provisions set forth in
the Qualified Plan with respect to the administrative powers and duties of the
company, expenses of administration, and procedures for filing claims shall also
be applicable with respect to the Plan.  The Company shall be entitled to reply 
conclusively upon all tables, valuations, certificates, opinions and reports 
furnished by any actuary, accountant, controller, counsel or other person 
employed or engaged by the Company with respect to the Plan.

                                  ARTICLE VII

                            AMENDMENT OR TERMINATION

        7.1      Amendment or Termination.  The Company intends the Plan to be 
permanent but reserves the right to amend or terminate the Plan when, in the 
sole opinion of the Company, such amendment or termination is advisable.  Any 
such amendment or termination shall be made pursuant to a resolution of the 
Board and shall be effective as of the date of such resolution.





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        7.2      Effect of Amendment or Termination.  No amendment to or 
termination of the Plan shall directly or indirectly deprive any current or
former Participant or Surviving Spouse of all or any portion of any
Supplemental Retirement Benefit or Supplemental Surviving Spouse Benefit
payment of which has accrued prior to the effective date of such amendment or
termination or which would be payable if the Participant terminated employment
for any reason, including death, on such effective date of amendment or
termination.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

        8.1      Funding.  The Plan at all times shall be entirely unfunded and 
no provision shall at any time be made with respect to segregating any assets 
of the Company for payment of any benefits hereunder.  No Participant, Surviving
Spouse or any other person shall have any interest in any particular assets of 
the Company by reason of the right to receive a benefit under the Plan and any 
such Participant, Surviving Spouse or other person shall have only the rights 
of a general unsecured creditor of the Company with respect to any rights under
the Plan.  No right or benefit under this Plan shall be subject to anticipation,
alienation, sale, assignment, pledge, encumbrance, or charge, and any attempt 
to anticipate, alienate, sell, assign, pledge, encumber, or charge the same 
shall be void.  No right or benefit hereunder shall in any manner be liable for
or subject to the debts, contracts, liabilities, or torts of the person 
entitled to such benefit.  If any Participant or Surviving Spouse under this 
Plan should become bankrupt or attempt to anticipate, alienate, sell, assign, 
pledge, encumber, or charge any right to a benefit hereunder or under the Plan,
then such right or benefit shall, in the discretion of the Company, cease and 
determine, and, in such event, the Company may hold or apply the same or any 
part thereof for the benefit of such Participant or his Surviving Spouse, and 
in such portion as the Company, in its sole and absolute discretion, may deem 
proper.

        8.2.     General Conditions.  Except as otherwise expressly provided 
herein, all terms and conditions of the Qualified Plan applicable to a Qualified
Plan Retirement Benefit or a Qualified Plan Surviving Spouse Benefit shall also
be applicable to a





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Supplemental Retirement Benefit or a Supplemental Surviving Spouse Benefit
payable hereunder.  Any Qualified Plan Retirement Benefit or Qualified Plan
Surviving Spouse Benefit, or any other benefit payable under the Qualified
Plan, shall be paid solely in accordance with the terms and conditions of the
Qualified Plan and nothing in this Plan shall operate or be construed in any
way to modify, amend or affect the terms and provisions of the Qualified Plan.

        8.3      No Guaranty of Benefits.  Nothing contained in the Plan shall
constitute a guaranty by the Company or any other entity or person that the 
assets of the Company will be sufficient to pay any benefit hereunder.

        8.4      No Enlargement of Employee Rights.  No Participant or Surviving
Spouse shall have any right to a benefit under the Plan except in accordance 
with the terms of the Plan.  The establishment of the Plan shall not be 
construed to give any Participant the right to be retained in the employment
service of the Company.

        8.5      Spendthrift Provision.  No action under this Plan by the 
Company or its Board shall be construed as creating a trust, escrow or other 
secured or segregated fund in favor of the Participant, his Surviving Spouse, 
or any other persons otherwise entitled to his Supplemental Retirement Benefit.
The status of the Participant and his Surviving Spouse with respect to any 
liabilities assumed by the Company hereunder shall be solely those of unsecured
creditors of the Company and its Subsidiaries who employ such Participant.  Any
asset acquired or held by the Company and its Subsidiaries in connection with 
liabilities assumed by it hereunder, shall not be deemed to be held under any 
trust, escrow or other secured or segregated fund for the benefit of the 
Participant or his Surviving Spouse or to be security for the performance of 
the obligations of the Company or any Subsidiary, but shall be, and remain a 
general, unpledged, unrestricted asset of the Company and its Subsidiaries at 
all times subject to the claims of general creditors of the Company and its 
Subsidiaries.

        8.6      Small Benefits.  If the actuarial value of any Supplemental 
Retirement Benefit or Supplemental Surviving Spouse Benefit is less than $3,500,
the Company may pay the actuarial





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value of such benefit to the Participant or Surviving Spouse in a single lump
sum in lieu of any further benefit payments here-under.

        8.7      Incapacity of Recipient.  If any person entitled to a benefit 
payment under the Plan is deemed by the Company to be incapable of personally 
receiving and giving a valid receipt for such payment, then, unless and until 
claim therefor shall have been made by a duly appointed guardian or other legal
representative of such person, the Company may provide for such payment or any
part thereof to be made to any other person or institution then contributing 
toward or providing for the care and maintenance of such person. Any such 
payment shall be a payment for the account of such person and a complete 
discharge of any liability of the Company and the Plan therefor.

        8.8      Corporate Successors.  The Plan shall not be automatically 
terminated by a transfer or sale of assets of the Company or by the merger or 
consolidation of the Company into or with any other corporation or other entity,
but the Plan shall be continued after such sale, merger or consolidation only 
if and to the extent that the transferee, purchaser or successor entity agrees
to continue the Plan.  In the event that the Plan is not continued by the 
transferee, purchaser or successor entity, then the Plan shall terminate subject
to the provisions of Section 7.2.

        8.9      Unclaimed Benefit.  Each Participant shall keep the Company 
informed of his current address and the current address of his spouse. The 
Company shall not be obligated to search for the whereabouts of any person. If
the location of a Participant is not made known to the Company within three 
(3) years after the date on which payment of the Participant's Supplemental
Retirement Benefit may first be made, payment may be made as though the
Participant had died at the end of the threeyear period.  If, within one
additional year after such three-year period has elapsed, or, within three
years after the actual death of a Participant, the Company is unable to locate
any Surviving Spouse of the Participant, then the Company shall have no further
obligation to pay any benefit hereunder to such Participant or Surviving Spouse
or any other person and such benefit shall be irrevocably forfeited.





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        8.10     Limitations on Liability.  Notwithstanding any of the 
preceding provisions of the Plan, neither the Company nor any individual acting
as an employee or agent of the Company shall be liable to any Participant,
former Participant, Surviving Spouse or any other person for any claim, loss,
liability or expense incurred in connection with the Plan.

        8.11     Withholding and other Employment Taxes.  The Company shall 
comply with all federal and state laws and regulations respecting the 
withholding, deposit and payment of any income or other taxes relating to any
payments made under this Plan.

        8.12     Applicable Law.  The Plan shall be construed and administered
under the laws of the State of Oklahoma.

        8.13     Binding Effect.  To the extent provided in this Plan, the Plan
shall be binding upon the Company and its successors and assigns.

        8.14     Effective Date.  The effective date of this Plan shall be 
January 1, 1991.

                                         HELMERICH & PAYNE, INC., a
                                         Delaware corporation
ATTEST:

/S/ Steven R. Mackey                     By /S/ Hans Helmerich         
- ------------------------------             ----------------------------
                     Secretary                                President
[SEAL]





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