INFLUENCE OF METHODS OF PESTICIDE APPLICATION ON SUBSEQUENT DESORPTION FROM SOILS

The amounts of fensulfothion [O,O-diethyl O-[p-(methylsulfinyl)phenyl]phosphorothioate] and its related sulfide [O,O-diethyl O-[p-(methylthio)phenyl]phosphorothioate] desorbed from 3 mineral soils with distilled water were greater when the compounds were spiked on the soil with either of 2 organic solvents (hexane-acetone, 95:5 vol/vol or pure acetone) than when they were initially adsorbed from aqueous solution. For muck soil, the method of applying the 2 insecticides did not greatly alter their subsequent desorption behavior.