CHEMICAL WEED MANAGEMENT IN KHARIF BLACK GRAM UNDER LATERITIC SOIL OF WEST BENGAL, INDIAK. Charan Teja, B. Duary, Subrata Mandal, Subhaprada Dash, R.B. Mallick and M. Sudheer Kumar
Field experiment was conducted during the kharif (wet) season of 2014 and 2015 in the farmers field of village Binuria, Sriniketan, Birbhum, West Bengal with blackgram variety WBU-108 to study the effect of imazethapyr and other herbicides on growth of composite weed flora and productivity of kharif blackgram. The experiment comprising of eight treatments was laid out in a randomized block design with three replications. From the experimental findings it revealed that Digitaria sanguinalis among the grasses; Cyperus iria among the sedges and Ludwigia parviflora and Croton bonplandianum among the broadleaved weeds were predominant throughout the cropping period. Higher doses of imazethapyr (75, 100 and 125 g/ha) applied at 20 DAS effectively controlled the complex weed flora in blackgram at 45 DAS. Yield reduction in kharif blackgram due to weed infestation was to the tune of 26-29%. Lower values of weed density, total weed dry weight and higher values of weed control efficiency and yield of blackgram were registered with post emergent application of imazethapyr at 75 g/ha at 20 DAS which was followed by imazethapyr at 100 g/ha at 20 DAS. These treatments may be recommended for managing composite weed flora and obtaining higher yield of kharif blackgram in the lateritic belt of West Bengal, India.
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