Effects of dichlorvos on organic matter status in soils
1992
Sattar, M.A. | Malakar, S.S. | Matin, M.A. | Hossain, M.A. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Soil Science)
Five common Bangladesh soils were treated with a dichlorvos organophosphorus pesticide each at the rates of 0, 10, 100, 1,000 and 10,000 ppm. The soils were preserved for 40 days at room temperature under field capacity moisture condition. The moisture level was corrected once a week. With uniform mixing 50 g soil from each sample was collected after 0, 5, 10, 20, 30 and 40 days of observation to determine the organic matter contents in soils. Dichlorvos gradually decreased the organic matter contents in all five soil materials upto 20 days of incubation, and then slightly increased with the progress of time. Dichlorvos strongly inhibited the organic matter status in the soils with increasing dosages of application. The growth was linear with high levels of dichlorvos applied in soils, and the correlation coefficient values of -0.773 to -0.969 confirmed the results. With control treatment the organic matter content did not change significantly during the different periods of observation. The standard deviation was also applied to the results to detect the yield variations within 40 days. The decomposition of organic matter was almost similar within five soils used in the experiment. High organic matter content was recorded from Grey floodplain and Acid sulphate soils of Bangladesh.
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