Author(s): S. MO ND AL, S. C. KUIRY, G. K. GHOSH, P. K. BISW AS AND G. C. MALIK

Abstract: A laboratory experiment was conducted in the Institute of Agriculture, Siriniketan to study the effect of pyrazosulfuron-ethyl on microbial biomass carbon and ammoniflcation using two levels of pyrazosulfuron-ethyl (0 and 20 g a.i. ha-1), two nitrogen sources (urea and vermicompost supplying N @ 100 kg ha-1). Soil was incubated for 50 days under saturates condition and analyzed for microbial biomass carbon and NH4-N contents on 0, 5, 10, 15, 20, 30, 40 and 50 days. Soil microbial biomass carbon was increased with time. Vermicompost treated soils maintained much higher values than urea and control. Pyrazosulfuron-ethyl caused reduction in microbial biomass carbon and NH4-N contents. Tlie contents of NH4-N were initially increased, reaching maximum values at 30 days and decreased afterwards. Urea treatments contained higher amounts of NH4-N compared to others. There was a net mineralization of nitrogen from soils receiving urea. With vermicompost, there was a net immobilization of nitrogen.

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