Exhibit 23.1 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS Stockholders and Board of Directors Rentech, Inc. Denver, Colorado We hereby consent to the incorporation by reference in the Prospectus constituting a part of this Registration Statement of our report dated December 12, 2001, relating to the consolidated financial statements of Rentech, Inc. appearing in the Company's Annual Report on Form 10-K/A for the year ended September 30, 2001. We also consent to the reference to us under the caption "Experts" in the Prospectus. /s/ BDO Seidman, LLP Dallas, Texas October 23, 2002