PJB-2006-79
COMBINED EFFECTS OF PESTICIDE ON GROWTH AND NUTRITIVE COMPOSITION OF SOYBEAN PLANTS
ZAMIN SHAHEED SIDDIQUI* AND SOALIHA AHMED
Abstract
The present study was carried out in a field located at Department of Botany, University of Karachi where soil was treated with various concentrations of pesticides before sowing. Combined effects of pesticides on soybean growth and nutritive composition of seeds were observed. Pesticide treated soil had significant effects on leaf growth components such as leaf area ratio, leaf area index, specific leaf area, net assimilation rate, leaf weight ratio and leaf area duration. Low concentration of pesticide enhanced leaf growth components at all the growth stages studied. The plants grown at the site treated with 0.25g L-1 pesticide, displayed maximum relative growth rate (RGR) and crop growth rate (CGR) compared to control. However, significant reduction in CGR and RGR were recorded at the sites treated with 0.5 and 0.75g L-1 concentration. Total phenols in leaf, shoot and fruit were used as a stress indicator to ascertain the possibility of chemical stress caused by systemic pesticide. 114 and 220% increase in total phenol at vegetative stage and 50
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