Vol. 14 No. 3
Impact of herbicides on density of various weed species associated with late sown wheat
Author(s): S. Shil and S. Paul
Abstract: An experiment was carried out to assess the effect of different herbicide treatment (single or in combination) on weed population of late sown wheat variety, UP 2425 and its associated weed during rabi season at Agronomy Farm of Narendra Deva University of Agriculture and Technology, Kumarganj, Faizabad,U.P. by taking ten treatments viz. isoproturon @ 1000 g ha-1, clodinafop @ 60g ha-1, sulfosulfuron @ 25 g ha-1, metasulfuron methyl @ 4 g ha-1, isoproturon + metasulfuron methyl @ (1000+4) g ha-1, clodinafop + metasulfuron methyl @ (60+4) gha-1, sulfosulfuron + metasulfuron methyl @ (25+4) g ha-1, carfentazone @ 25 g ha-1, Weedy and weed free. Post emergence application of sulfosulfuron + MSM (25+4 g ha 1) significantly reduced the number of weeds as compared to other treatments but remained at par with weed free and isoproturon +MSM @ (1000 + 4g ha-1). Growth and yield of the wheat crop was significantly higher with weed free and the values were at par with post emergence application of sulfosulfuron + metasulfuron methyl @ (25 + 4 g ha-1) and isoproturon + metasulfuron methyl (1000+4 g ha-1. From the above experimental observation, it might be concluded that herbicidal treatments reduced the weed population per unit area appreciably over weedy at 60th, 90th day and harvest stages of crop growth. Next to weed free, post emergence application of sulfosulfuron + MSM (1000 + 4 g ha-1) has been found most effective to control the weeds as compared to other herbicide treatments at all the stages. Post emergence application of isoproturon + MSM (1000 + 4 g ha-1) was found at par with clodinafop + MSM (60 + 4 g ha-1) and both were significantly superior to weedy check and economically feasible for higher production of late sown wheat.
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