Shizuoka Travel on Because hybrid corn yields were so much greater than the original yields, the use of mechanization and hired labor increased. At the end of WORLD WAR II, the military had accumulated a large store of nitrogen. The USDA, working with the military, created a special program to sell, at very low prices, this nitrogen to farmers as a substitute for organic fertilizers. Unfortunately, the highly concentrated form of nitrogen sold by the USDA damaged some plants. So, in the 1950s and 1960s breeders came out with new plant varieties that were bred to grow in nitrogen-rich soil. The richer soil made it possible to grow more plants in the same space, but the richer soil also allowed for the proliferation of weeds. The concentration of plants, and monoculture, also attracted more insects and plant disease. Shizuoka Travel 2016.
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