Third amendment to Agreement of Limited Partnership of PCS Nitrogen Fertilizer, L.P. dated December 15, 2003

Exhibit 10(k)

THIRD AMENDMENT TO
AGREEMENT OF LIMITED PARTNERSHIP
OF
PCS NITROGEN FERTILIZER, LP

        This Third Amendment (“Amendment”) to the Agreement of Limited Partnership dated March 3, 1992, among Arcadian Corporation, a Delaware corporation (“Arcadian”), as the General Partner, Mark S. Flynn, as the Organizational Limited Partner, and Arcadian Partners, L.P., a Delaware limited partnership (“Arcadian Partners”), as the Limited Partner, as amended by Amendment to Limited Partnership Agreement dated March 6, 1997 between PCS Nitrogen, Inc. a Delaware corporation (“Nitrogen”), as successor to Arcadian, and Arcadian Partners and by Second Amendment to Limited Partnership Agreement dated December 15, 2002 between PCS Nitrogen Fertilizer Operations, Inc., a Delaware corporation (“Operations”), as successor to Nitrogen, and PCS LP, Inc., a Delaware corporation (“PCS LP,” together with Operations, “Partners”), as successor to Arcadian Partners (such Agreement of Limited Partnership, as so amended, being referred to as the “Agreement”), is made this 15th day of December 2003 between Operations and PCSLP.

        WHEREAS, Operations and PCS LP are all the Partners to the Partnership Agreement;

        WHEREAS, the Partners wish to amend the Partnership Agreement with respect to distribution to the General Partner;

        NOW THEREFORE, effective as of the date of this Amendment, the Partners hereby agree to amend the Agreement as follows:

        The Partners hereby agree as follows:

        IN WITNESS WHEREOF, Operations and PCS LP have caused this Amendment to be duly executed and delivered by their respective representatives as of this 15th day of December, 2003.