Author(s): A. Chakravarty, S. Majumder, D. Mukherjee and D. Saha

Abstract: A green house experiment was conducted to study the effect of different insecticides on population and activities of microorganisms in a typic ustiflavent soil. Results in general, revealed that insecticides BHC, Phosphomidon and Quinalphos exert beneficial effect on growth and activities of total bacteria, actimycetes, fungi, ammonifying and non-symbiotic nitrogen fixing bacteria as well as phosphate solubilizing organisms in the early stages whereas, Chlorpyriphos and Carbaryl showed positive influence at the later stages of the experiment. Nitrogen fixing and phosphate solubilizing power of soils are in accordance with the growth and activities of microorganisms in regard to different insecticides under study.

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