Effect of date of sowing and weed management techniques on density, dry weight, control efficiency of weed and yield of blackgram (Vigna mungo l.)

A field experiment was conducted during kharif season at 2016 on effect of date of sowing and weed management techniques on density, dry weight, control efficiency of weed and yield of blackgram (Vigna mungo L.). The treatment comprises three date of sowing (S1- 15th July, S2- 25 July and S3- 05th August) and four weed management techniques (W1- Control plot, W2- mechanical weeding at 15 and 30 DAS and removal of weeds within row by hand, W3- Pendimethalin @ 0.75 liter a. i. ha-1 at 0-2 DAS + mechanical weeding at 30 DAS W4- Pendimethalin @ 0.75 liter a. i. ha-1 at pre-emergence + sodium acifluorfen (16.5%) + clodinafop- propagyl (8%) EC @ 0.245 liter a. i. ha-1 at 20-25 DAS) respectively laid out in split plot design with three replications (Main plot consists – date of sowing and sub plot – weed management techniques). The result reveled that treatment combination of first date of sowing (S1) with application of two mechanical weeding (W2) at 15 and 30 DAS was found most effective for reducing weed population or densities and dry weight of weeds ( viz. monocot, dicot and sedges weeds), higher weed control efficiency (W2) treatment and maximumweed index (W1) are followed by date of sowing 15th July with application of pendimethalin @ 0.75 liter. a.i. ha-1 at 0-2 DAS + mechanical weeding at 30 DAS.