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acre of grass addi Aeration agricultural processing plants AGRICULTURAL RESEARCH agricultural scientists amount of chemicals aquat areas bacterium basins Cellular blocks cide citrus conservation practices control these pests corn borer costly dehydrate destroy developing disposal plant dredging drought Dryland eliminate farm wastes farmers feed fertilizer find new methods flooding 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 Maryland method of controlling milk moisture monitor soils mulch parasites percent pesticide residues planted to grass prevent erosion problem producers protect the environment proved effective purify the runoff radioactive resistance rivers runoff water safe Science in agriculture seed seedling shallow pond silting source of pollution source of water sterilization stored grain stream strip cropping strontium 90 sulting terracing tested tons treat ucts upstream wasps water pollution waterways weed wheat whey