Author(s): S. Paul, S. Shil, T. Biswas and A. K. Singh

Abstract: An experiment was conducted to assess the effect of different herbicides on growth and yield of late sown wheat variety, UP 2425 and associated weeds during rabi season 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) g ha-1, Sulfosulfuron + Metasulfuron methyl @ (25+4) g ha-1, Carfentazone @ 25 g ha-1, Weedy and Weedy free. The treatments were arranged in randomized block design with three replications. Results revealed that post emergence application of sulfosulfuron + MSM (25+4 g ha 1) significantly reduced the number and dry weight of weeds as compared to other treatments but remained at par with weed free and isoproturon +MSM @ (1000 + 4g ha-1). All the growth and yield contributing characters viz. plant population and height, shoots m-2, leaf area index, no. and length of spike, grains spike-1 and 1000 grain weight as well as grain and straw yield were 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). Thus, it could be concluded that post emergence application of sulfosulfuron (25g ha-1) tank mixed either with Metasulfuron methyl (4 g ha -1) or with isoproturon (1000g ha-1) applied at 45 DAS was found most effective in weed control for higher production of late sown wheat.

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