Terra Nitrogen Company, L.P. is a producer of nitrogen fertilizer products. The Company's principal products are anhydrous ammonia (ammonia) and urea ammonium nitrate solutions (UAN). The Company conducts its operations through an operating partnership, Terra Nitrogen, Limited Partnership (TNLP). The Company's nitrogen products are used primarily by farmers to help in the yield of their crops. Its manufacturing operations are located at Verdigris, Oklahoma. Terra Nitrogen GP Inc. (TNGP) is the general partner of both the Company and TNLP. TNGP is an indirect, wholly owned subsidiary of CF Industries Holdings, Inc. (CF Industries). CF Industries, through its subsidiaries, is engaged in nitrogen fertilizer manufacturing and distribution, serving both agricultural and industrial customers.