Mobility of OP Pesticides in Soil as Affected by Physico Chemical Characteristics of Soil
2005
Varmā, Gāyatrī | Kumar, A. | Tomer, Alka | Singh, KK
The mobility (Rf) of the OP pesticides malathion, phosphamidon, dichlorvos, dimethoate and thiometon was studied in soil by using soil thin layer chromatography (s-TLC). The effect of soil organic matter (OM) and its fractions i.e. humic (HA) and fulvic acids (FA), clay content, soil pH and exchangeable cations were investigated. The pesticides mobility followed the order thiometon>dimethoate>.phosphamidon>malathion> dichlorvos in both soils while malathion was more mobile than phosphamidon in Agra sandy loam soil. The OM, HA, FA, clay content, pH and exchangeable cations were found to decrease the pesticide mobility in soils except for malathion and phosphamidon which showed an increase in mobility on addition of humic acid to soil. The results have been explained on the basis of their adsorption/complexation, the nature of soil colloids and the molecular structure of pesiticides.
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