Residual fate and dissipation pattern of endosulfan (50 WDG) in soil and plant was studied by gas liquid chromatography following twice applications (at 350 g and 700 g a.i. ha(-1)) in chick-pea, Bengal gram (Cicer arietinum) at vegetative and flowering stages of the crop. The initial residues of Endosulfan (alpha + beta + endosulfan sulfate) in plant following second application was 23.40-57.91 microg g(-1) and its maximum deposit in soil was 1.00-2.45 microg g(-1) after 1 day. Dissipation followed first order reaction kinetics and the half-life values were 2.6-2.9 days in green foliage and 4.4-5.0 days in soil. A pre-harvest interval of 14-19 days was recommended for green foliage. No residues were detected in harvested seeds. Maximum concentration of the metabolite endosulfan sulfate was 0.152-0.473 microg g(-1) in soil and 5.42-9.40 microg g(-1) in plant on third day. Endosulfan-beta was more persistent than alpha-isomer attributable to higher conversion of the later to endosulfan sulfate in soil and plant.
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