Vol. 12 No. 3
Chemical weed management in black gram (Vigna mungo L.)
Author(s): S. K. DAS and K. JANA
Abstract: Field experiments were conducted for three years at Pulses and Oilseeds Research Station, Berhampore, Murshidabad, West Bengal, India during kharif 2010, 2011 and 2012 to develop an efficient chemical weed management practice with newer herbicidal molecules in black gram. The experiment was laid out in a randomized block design with three replications having nine treatments viz. W0 – Weedy check, W1 – Hand weeding twice at 20 and 40 DAS, W2 – Pendimethalin @ 1.0kg ha-1 as PE (Pre-emergence) at 1 DAS, W3 – Quizalofop ethyl @ 37.5g ha-1 as PoE (Post-emergence) at 10-15 DAS, W4 – Chlorimuron ethyl @ 4.0g ha-1 as PoE (10-15 DAS), W5 – Fenoxaprop-p-ethyl @ 50g ha-1 as PoE (10-15 DAS), W6 – Quizalofop ethyl @ 37.5g ha-1 + Chlorimuron ethyl @ 4.0g ha-1 as PoE (10-15 DAS) , W7 – Fenoxaprop-p-ethyl @ 50g ha-1 + Chlorimuron ethyl @ 4.0g ha-1 as PoE (10-15 DAS) , and W8 – Imazethapyr @ 25ml ha-1 as PoE (15-20 DAS). Experimental results revealed that highest seed yield (1266.5 kg ha-1) was recorded under the treatment W1 and lowest with W0 (622.2 kg ha-1). Application of chemical herbicides significantly improved the seed yield over W0. The treatments W7 (1247.4 kg ha-1) and W6 (1195.1 kg ha-1) were found at par with W1. Significant reduction in the total weed density and total weed dry weight were found with the application of Fenoxaprop-p-ethyl @ 50g ha-1 + Chlorimuron ethyl @ 4.0g ha-1 as PoE (10-15 DAS) and Quizalofop ethyl @ 37.5g ha-1 + Chlorimuron ethyl @ 4.0g ha-1 as PoE (10-15 DAS). Chemical weed control measures increased the total microbial population by 80.3 to 109.5% over weedy check and 57.5 to 83% over twice hand weeding. It was also revealed that nodulation in black gram was not affected significantly due to the application of chemical herbicides.
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