Terra Nitrogen Company, L.P. (TNCLP) (NYSE: TNH) has filed its annual report on Form 10-K for the fiscal year ended December 31, 2011 with the Securities and Exchange Commission. The annual report on Form 10-K is available free of charge through CF Industries Holdings, Inc.’s website, www.cfindustries.com. Unitholders may also receive a hard copy of the annual report on Form 10-K, which includes the audited financial statements, free of charge upon request. Send requests to Terra Nitrogen Company, L.P. at the following address: 4 Parkway North, Suite 400, Deerfield, Illinois 60015, Attention: Investor Relations. About TNCLP Terra Nitrogen Company, L.P. is a leading manufacturer of nitrogen fertilizer products. TNCLP is the sole limited partner of Terra Nitrogen, Limited Partnership (TNLP), owner of the Verdigris, Oklahoma manufacturing facility and related assets. Terra Nitrogen GP Inc., an indirect, wholly-owned subsidiary of CF Industries Holdings, Inc., is the General Partner of TNCLP and exercises full control over all of TNCLP’s business affairs.