Abstract
The present study envisages the effect of different doses of three carbamate pesticides, namely, methyl N,N'-dimethyl-N-(methyl-carbamoyl)oxythiooxamimidate (Oxamyl) (I), S-ethyl-N-(methylearbamoyl)oxythioacetamidate (II)and N-phenyl(1-ethylcarbamoyl)propylcarbamatea (III) on the change in concentration of different forms of Mn and Fe status; change in pH, EC and redox potential (Fit) of a saline soil over a period of 90 days. The correlation coefficients amongst them arc also calculated. The results reveal that there is an optimum effect on the water-soluble, exchangeable, active Mn; exchangeable and available Fe; EC and E h , with 0.25 g kg - 1 soil of pesticide I; 0.2 g kg - 1 of pesticide II and 0.3 g kg - 1 soil of pesticide III after 30 days of application. The pH was found to decrease with the time upto 30 days. The water-soluble, exchangeable, active Mn; exchangeable, available Fe, E h and EC were positively correlated with each other, while negatively correlated with reducible Mn and pH. The results have been explained on the basis of chemical and microbial activity of pesticides in soils. The activity of carbamate pesticides is in the order, II > I > III.
Published Version
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