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acre of grass addi Aeration agricultural processing plants AGRICULTURAL RESEARCH SERVICE agricultural scientists amount of chemicals animals aquat areas attack bacterium basins Cellular blocks cide citrus conservation practices control these pests corn borer costly dehydrate destroy developing disposal plant dredging drought Dryland effective eliminate erosion farm wastes farmers feed fertilizer find new methods Flowering friendly insects fumigation garden plots grass cover herbicide hold soil hydroponic industrial insect and disease insect pests insecticides land larvae lawn grasses livestock manure lagoon method of controlling milk moisture monitor soils mulch parasites percent pesticide residues planted to grass PREVENTS POLLUTION problem producers protect the environment purify the runoff radioactive resistance rivers runoff water safe Science in agriculture Sediment seed seedling shallow pond silting source of pollution source of water sterilization stream strip cropping strontium 90 sulting tested tion tons treat ucts upstream wasps water pollution waterways weed wheat whey