. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. AGRICULTURAL LANDS. Figure 15. Percentage of cropland for which no-till planting methods were applied in 1987. Source: Department of Agriculture, Soil Conservation Service. (Figure 24). Since 1985, over 96% of the corn and soybean acreage receives at least one application of herbicide (Pike ct al. 1991). In the United States, herbicides now constitute 90% by weight of all pesticides used in agr
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. AGRICULTURAL LANDS. Figure 15. Percentage of cropland for which no-till planting methods were applied in 1987. Source: Department of Agriculture, Soil Conservation Service. (Figure 24). Since 1985, over 96% of the corn and soybean acreage receives at least one application of herbicide (Pike ct al. 1991). In the United States, herbicides now constitute 90% by weight of all pesticides used in agriculture (National Research Council 1989). Data from the Department of Agriculture (Figures 23 and 25) show that the acreage treated with at least one insecticide for any insect pest rose to over 40% in the late 1980s and never exceeded 60%. Nevertheless, data collected by University of Illinois researchers and presented in Table 1 show a different trend for soil insecticides, which typically dominate corn insecticide treatments. In the late 1960s, 70% of corn in Illinois was treated with a soil insecticide. The percentage is now under 30% in the 1990s, due to educational and insect monitoring programs. In addition, the dosages of chemicals applied per acre decreased during the 1980s (National Research Council 1989). Almost all previous surveys described only the amount of land treated with pesticide applications. The amount of farmland treated with various chemicals is only a crude measure of chemical disturbance. The biochemi- cal properties of such compounds and the amounts of active ingredient applied are of critical importance. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of E
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