PJB-2004-97
PERSISTENCE OF CHLORPYRIFOS AND FENPROPATHRIN ALONE AND IN COMBINATION WITH FERTILIZERS IN SOIL AND THEIR EFFECT ON SOIL MICROBES
SHAHIDA AKHTAR, SYEDA TALAT SHAHEEN GILANI AND NUSRAT HASAN
Abstract
The study was designed to determine the persistence of chlorpyrifos (an organophosphate) and fenpropathrin (pyrethroid) pesticide alone and in combination with synthetic fertilizers viz., Urea, DAP, SOP and Foliar fertilizer Polydol with tap/hard water. All the fertilizers were added @ 1% to the soil collected from vegetable growing area of Memon Goth, Karachi and insecticide fortification was done @ 100 ppm and 1000 ppm. Results indicated that the addition of fertilizers had no effect on the persistence of OP and pyrethroid pesticides. Similarly, the changes observed in the pH both with tap and hard water had no effect on the persistence. The 2-months study showed 100% persistence of both the pesticides.
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