Urea Ammonium Nitrate (UAN)
UAN is a clean, odorless, and non-hazardous liquid fertilizer. Terra Industries is the largest producer of UAN in the United States, producing 3.85 million tons of UAN annually.  UAN is used mostly in North America and only recently has been traded in international markets. Because of its high water content, UAN is expensive to transport, limiting its distribution to local regions.