116 nitrogen fixed ammonia data in thousand metric tons of unless otherwise noted domestic production and use was produced by 16 companies at 32 plants 19 states the united during 2004 fifty four percent total us capacity centered louisiana oklahoma texas because their large reserves natural gas dominant feedstock producers operated about 72 rated remained world s second largest producer consumer following china urea ammonium nitrate phosphates nitric acid sulfate were major derivatives descending order importance approximately 90 apparent consumption for fertilizer including anhydrous direct application nitrates other compounds also used to produce plastics synthetic fibers resins explosives numerous chemical salient statistics 1 2000 2001 2002 2003 e 2 11 800 9 120 10 100 8 770 900 imports 3 880 4 550 670 5 720 exports 662 647 437 400 430
