Weed control in chickpea (Cicer arietinum L.)
1991
Yasin, J.Z.A.
Field experiments were carried out to study the effect of weed interferance and efficiency of herbicides in conrolling weeds in winter sown chickpeas - 1989/90 in two locations; 1990/91 - one location. The overall reduction in grain and straw yields was 82% and 63% respectively. The studies indicated that these reductions were due to the reduction in number of pods per plant, plant density, number of secondary branches, hundred seed weight and number of primary branches. The average reduction in these yield components was 52%, 53%, 35%, 17% and 15%, respectively. The critical periods for weed removal for grain and straw yields was found to be 5 weeks after emergence at Um-Ba satein location and 7 weeks at Jubeiha and M'shagar. Herbicides varied in their efficiency in controlling the weeds, fluazifop-butyl and sethoxydim at 50 g active ingredient (a.i./du were able to result in significant increase in grain yield in areas infested with grassy weeds. Terbutryn at 400g a.i./du was effective in areas infested with broad-leaf weeds. Combination of grass and broad-leaf herbicides were more effective than any herbicide sprayed alone. Terbutryn + sethoxydim or fuazifop-butyl were most effective in locations where grassy weeds were dominant, while terbutryn + pronamide was most effective in areas where narrow-leaf weeds density was lowest. Two hand weedings, at 30 and 60 days after emergence were effective in increasing grain yield significantly at all locations
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