Terra Nitrogen Company, L.P. (TNCLP) produces nitrogen fertilizer products. The Company�s principal products are anhydrous ammonia (ammonia) and urea ammonium nitrate solutions (UAN), which it manufactures at the Company�s facility in Verdigris, Oklahoma. The Company conducts its operations through an operating partnership, Terra Nitrogen, Limited Partnership (TNLP and collectively with TNCLP, the Partnership). Terra Nitrogen GP Inc. (TNGP) is a partner of both TNCLP and TNLP and owns 0.05% general partner interest in the Partnership. The General Partner is an indirect, wholly owned subsidiary of CF Industries Holdings Inc (CF Industries). CF Industries Holdings is the holding company for the operations of CF Industries, Inc (CF Industries), is engaged in nitrogen and phosphate fertilizer manufacturing and distribution, serving both agricultural and industrial customers. During the year ended December 31, 2012, the Company sold 2.4 million tons of nitrogen fertilizers.