Abstracto

Effect of Weedicides on Physiological parameters, Growth, Yield and Yield components of Soybean (Glycine max. L) and Weed Growth

Amaregouda A, Jitendra Jadhav, Chetti MB and Nawalagatti.

A field experiment was conducted during kharif 2006 to study the effect of weedicides on physiological parameters, growth, yield and yield components of Soybean (Glycine max. L) and weed growth at College of Agriculture, University of Agricultural Sciences, Dharwad. Data revealed that among herbicides pendimethalin 1350.5(g a.i/ha) and imazethepyr 87.50 (g a.i/ha) gave season long weed control and effectively checked the weed density. All herbicides increased leaf dry matter, stem dry matter and total dry matter. The herbicides also increased important physiological characters like leaf area ,LAD,RGR, CGR and NAR. Where, weed competition reduced all these parameters. Nitrate reductase activity and total chlorophyll content were higher in pendimethalin 1350.50 (g a.i/ha) and imazethepyr 87.50 (g a.i/ha) .tepraloxydim 100.0 (g a.i/ha).All herbicide treatments significantly improved yield and yield components like number of pods per plant, number of seeds per plant, 100 seed weight, pod weight and harvest index compared to control and increase was more in pendimethalin 1350.5 (g a.i/ha) and imazethepyr 87.50 (g a.i/ha) treatments