PHYSICO-CHEMICAL AND BIOLOGICAL ACTIVITIES OF BLACK CLAY SOILS AS POLLUTED BY ACETAMIPRID (A NEW NEO-NICOTINOID INSECTICIDE)S. JAHEERUNNISA, S.N. RASOOL, V. RANGASWAMY AND R. RAMANJANEYULU
The effect of acetamiprid (a new neonicotinoid group insecticide) on physico-chemical and biological activities of black clay soils of a cotton field in Nandyal, Andhra Pradesh state, India were investigated in this study. Two types of soil samples: agricultural soils and non-cultivated soils were used. These soils were clayey in texture. The clay, silt and sand percentages in agricultural and non-cultivated soils were determined as 50.8 and 53.2%, 25.2% and 24.8, 24 and 22%, respectively. Maximum water holding capacity, pH and electrical conductivity were 54 and 58%, 8.0 and 7.3 and 0.44 and 0.54 m mhos cm-1, respectively in agricultural and non-cultivated soils. Organic matter content, total nitrogen, ammonium nitrogen, nitrite nitrogen, nitrate nitrogen, available nitrogen, available phosphorous and exchangeable potassium contents were found to be lower in agricultural soils than those of non-cultivated soils. Microbial counts and dehydrogenase activity were also reduced to significant levels in agricultural soils. These results clearly indicated the toxic effect of acetamiprid on soil physico-chemical and biological properties which are key elements in determining the soil quality and crop yield.
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