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12.5-square-foot samples 2-percent acre yielded aerosol form aerosol machine alfalfa treated aliquant removed 46.7 amount of DDT amounts of residue applied in aerosol approximately 200 grams area basis area sampled August 18 Beltsville benzene was added chlordane days after treatment DDT applied DDT per acre DDT residue dosage was applied dry hay filter paper five samples fresh benzene half-bloom stage heavier dosage hour's rotation inches insecticide July 12 July 9 June 25 locations loss of leaves nozzles number of samples Olney p.p.m. and averaged p.p.m. as compared p.p.m. when cut Peanut Forage peanut hay plots treated potato leafhopper pound of DDT pounds per acre removed 46.7 percent residue found residue obtained Residues remaining samples collected samples of forage samples of hay samples required samples were collected samples were taken similar samples spray sprayer standard deviation swath position taken on July three aliquants tion tobacco thrips toxaphene treated with DDT