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The present study aims to evaluate the effect of cypermethrin and chlorpyrifos on soil micro-organisms. The impact of these insecticides on soil microbial respiration was studied in the laboratory through replicated trials using cypermethrin and chlorpyrifos at 0,5,10,15,20,50, and100 ppm levels of fortification against the heterotrophic activities of soil micro-organisms which were measured in terms of the Carbon dioxide (CO2) evolved in the incubation chamber. The CO2that evolved was determined after an incubation period spanning 5, 20, 35, and50 days. The Carbon dioxide evolved from the soil was related with the microbial population and their activities. The results indicated the trend of a gradual increase in CO2 that evolved (0.73 to 0.96 mg/g) against the fortification range of 5 to100 ppm with cypermethrin after50 days of incubation as compared to control. Though there was a gradual decrease in CO2 that evolved (1.73 to 1.53 mg/g) with chlorpyrifos after 50 days of incubation as compared to the control, but there was no adverse effect on the soil’s micro-flora after treatment with chlorpyrifos. Thus, the effect of cypermethrin and chlorpyrifos on soil micro-flora in terms of CO2evolution revealed no adverse effect on soil microbial activity.

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Author(s): Mrs. Manisha Jail, Dr. RasmiUrkude and Dr. LataDeshmukh


soil micro-flora, pesticide fortification, CO2 evolution, Soil Contamination,Soil Microbiology

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