P- ISSN: 0976-1675
E- ISSN: 2249-4538

© CARAS (Centre for Advanced Research in Agricultural Sciences)
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Effect of Pesticides on Enzyme Activities in Paddy (Oryza sativa L.) Soils

The activity of soil enzymes is often employed as a marker of soil contamination. In paddy (black and alluvial) soil, responses of specific soil enzymes, amylase, invertase, cellulase, and myrosinase, were studied at different concentrations (10, 25, 50, 75, and 100 ppm) of four pesticides, carbosulfan, chlorpyrifos (insecticides), and kresoxim methyl, mancozeb (fungicides), which are comparable to field treatment rates (1.0, 2.5, 5.0, 7.5 and 10.0 kg ha-1). There was a significant rise in amylase, myrosinase activity at 2.5 kg ha-1, and invertase and cellulase activity at 5.0 kg ha-1 in paddy (black and alluvial) soil after a 10-day incubation period. Furthermore, when pesticide concentrations increase to between 7.5 and 10.0 kg ha-1, enzyme activity decreases. However, the stimulatory impact on four enzyme activities was maintained for 20 and 30 days, and the lowest enzyme activity was detected at 40-day incubation in paddy soil.

Research Article | Published online : 20-Nov-2023