EXHIBIT 3.20 CERTIFICATE OF AMENDMENT TO RESTATED CERTIFICATE OF INCORPORATION OF GREAT SALT LAKE MINERALS CORPORATION The undersigned officers, Marschall I. Smith and Rose Marie Williams, Vice President and Assistant Secretary, and Secretary, respectively of Great Salt Lake Minerals Corporation, a corporation organized and existing under the General Corporation Law of the State of Delaware (the "Corporation"), do hereby certify that: 1. Article FIRST of the Restated Certificate of Incorporation of the Corporation is hereby amended in its entirety as follows: "FIRST: The name of the corporation is IMC Kalium Ogden Corp." 2. This Certificate of Amendment was duly adopted by unanimous consent of the directors and sole voting stockholder of the Corporation according to the provisions of Sections 141(f), 229 and 242 of the General Corporation Law of the State of Delaware, IN WITNESS WHEREOF, the undersigned have hereunto subscribed their names this 18th day of June, 1998. GREAT SALT LAKE MINERALS CORPORATION By: ___________________________ Marschall I. Smith Vice President and Assistant Secretary ATTEST: By: _______________________ Rose Marie Williams Secretary