MUNITIONS GAVE RISE TO FERTILIZERS. “During the 1940s, fertilizer exploded in more ways than one. During the war, nitrogen was one of the prime components of TNT and other high explosives, and the U.S. government built 10 new plants to supply nitrogen for bombs. After the war, those plants produced ammonia for fertilizer. Fertilizer use exploded.””
”
http://www.livinghistoryfarm.org/farminginthe40s/crops_04.html