| Abstrakt: |
A study was conducted over a 3-year period to determine the persistence of BHC, DDT, Guthion® (O,O-dimethyl S-(4-oxo-1,2,3-benzotriazin-3-( 4H)-ylmethyl) phosphorodithioate), and malathion in the soil and the effects on the growth of cotton. Residue determinations showed that DDT was the most persistent of the insecticides; about 36% remained in the soil at the end of the third year. BHC total isomers was the next most persistent; about 5% remained. The disappearance rate of Guthion and malathion was rapid. There were no significant differences in germination, growth, fruiting, or yield of cotton attributed to high initial rates per acre and subsequent annual rates of the insecticides applied to the soil. |
