Dynamics of Weed and Productivity in Summer Green Gram (Vigna radiata L.) by Using Different Nitrogen Levels and Weed Control Techniques in South-Eastern Odisha

Abstract

A field experiment was carried out at ARS, Faculty of Agricultural Sciences, SOADU, Bhubaneswar, on Dynamics of weed and productivity in summer Green Gram (Vigna Radiata L.) by using different nitrogen levels and weed control techniques in south-eastern Odisha during summer, 2022. The experiment was conducted in split plot design with three replications comprising fifteen treatment combinations. The main plot had three levels of nitrogen, and the sub-plots used five weed control methods. The most prevalent weeds in the experimental plots were Poa annua, Digitaria sanguinalis, Echinochloa colona, Cleome viscose, Ageratum conyzoides, Portulaca oleracea and Melochia corchorifolia. According to the result, dry weight and weed density obtained for each crop growth stage were lower under 75% nitrogen. Similarly, two-hand weeding at 15 and 30 days after sowing reduced dry weight and weed density to the lowest level that was on par with ready-mix of pendimethalin + imazethapyr @ 0.75 kg ha-1 pre-emergence control. Similar to 100 % N application and maximum growth in terms of all yield parameters was observed under 125% nitrogen. In terms of weed control, pre-emergence treatment of the ready-mix herbicide was closely followed by two-hand weeding at 15 and 30 days after sowing, which produced the maximum seed yield (930.56 kg ha-1) and stover yield (2397.11 kg ha-1) for green gram. In comparison to the plots receiving two hand weeding and a ready-mix herbicide treatment, the seed yield in the untreated weed plots was 51.70 and 50.88% lower, respectively.