Author(s): A. MUKHERJEE, S. DUTTA, P. ROY KARMAKAR, R. K. KOLE AND A. BHATTACHARYYA

Abstract: The sulfonylurea herbicide pyrazosulfuron- ethyl [Ethyl 5- (4, 6- dimethoxy pyrimidine- 2- yl carbamoyl sulfamoyl) -1 – methyl pyrazole- 4- carboxylate] is a systemic herbicide absorbed by roots and leaves and translocates to the meristem. Dissipation of pyrazosulfuron- ethyl follows first order kinetics in both the alluvial and red lateritic soils of West Bengal under laboratory condition when applied @ 10 g (T1) and 20 g (T2) of the active ingredient per gram of soil. About 80% of the initial concentration of the herbicide in soil was dissipated by 30 days which further increased to more than 95% by 60 days. The rate of dissipation of pyrazosulfuron- ethyl was found to be similar (DT50 ~ 15 days) for both the soils.

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