Author(s): R. K. SINGH, S. K. VERMA, S. K. PRASAD AND S. B. SINGH

Abstract: An experiment was conducted during rabi season of 2008-09 and 2009-10 at the Research Farm of Department of Agronomy, BHU, Varanasi. The experimental field was infested with Rumex dentatus, Chenopodium album, Melilotus spp and Lathyrus aphaca among broad leaf weed during both years of study. Post emergence application of metsulfuron-methyl 20% WG@ 4 g ha-1 + 0.2% surfactant significantly reduced broad leaf weed population and total weed dry weight with highest wheat yield over other herbicidal treatments during both years. There was no phytotoxicity symptoms on crops. Weed control efficiency and harvest index was higher under metsulfuron-methyl 20% WG, 5 g ha-1 + 0.2% surfactant during both the years. The evaluation of weed dry weight and weed control efficiency of the different treatments and the regression of yield on it revealed that reduction in grain yield could be 8.05 kg ha-1 for weed dry weight and 1% increase in the weed control efficiency increased the grain yield by 13.27 kg ha-1, respectively.

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