| http://www.w3.org/ns/prov#value | - During the 1960s and 1970s both herbicides and insecticides were used on corn and tobacco, and use was expanded to include other major field crops such as cotton, soybean, sorghum, rice, peanuts, wheat and other small grains, hay, and pasture (Osteen and Szmedra, 1989).
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