کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4428874 | 1619805 | 2013 | 10 صفحه PDF | دانلود رایگان |
An experiment was performed to study non-target effects of difenoconazole (fungicide), deltamethrin (insecticide) and ethofumesate (herbicide) on microbial parameters in a clay-loam soil. Pesticides were applied as commercial formulations to soil samples at different concentrations (5, 50 and 500 mg kg− 1 DW soil) and then incubated under laboratory conditions for 3 months. Throughout the incubation period, microbial parameters were determined at days 7, 30, 60 and 90. At 5 mg kg− 1 DW soil, none of the three pesticides caused significant changes in soil microbial parameters. In contrast, at 500 mg kg− 1 DW soil, pesticide application decreased overall soil microbial activity, negatively affecting the activity of soil enzymes. Similarly, at 500 mg kg− 1 DW soil, difenoconazole and ethofumesate, but not deltamethrin, caused a pesticide-induced stress on soil microbial communities, as reflected by the respiratory quotient. Besides, deltamethrin and ethofumesate at 50 and 500 mg kg− 1 DW soil resulted in lower values of denitrification potential. It was concluded that, although pesticide concentration had a somewhat inconsistent and erratic effect on soil microbial parameters, pesticide application at 500 mg kg− 1 DW soil did have an impact on many of the microbial parameters studied here.
► Degradation rate decreased with increasing pesticide concentration.
► The lowest dose of pesticides did not cause changes in soil microbial communities.
► Higher pesticide concentration did not consistently increase impact on microorganisms.
► Pesticides increased soil NO3−, suggesting beneficial effect on the bacteria involved.
Journal: Science of The Total Environment - Volume 449, 1 April 2013, Pages 345–354