Influence of different weed management practices on growth and yield attributes of irrigated blackgram under Cauvery delta zone of Tamil Nadu

Abstract

A research trial was carried out during Kharif 2018 at Tamil Nadu Rice Research Institute, Aduthurai, Tamil Nadu to evaluate the weed management practices in irrigated blackgram in Cauvery delta zone. The results revealed that all growth and yield characters of blackgram were significantly affected by distinct weed control practices. A similar trend was also observed in weed parameters. Higher seed yield (853 kg ha-1) and higher weed control efficiency (87%) were recorded under application of pendimethalin @1 kg ha-1 on 3 DAS (fb) acifluorfen sodium (16.5%) + clodinafop propargyl (8% EC) @ 187.5 g ha-1 on 20 DAS and which comparable with pre emergence application of pendimethalin @ 1 kg ha-1 fb propaquizafop (2.5%) + imazethapyr (3.75% ME) @ 125g ha-1 on 20 DAS and hand weeding twice on 15 & 30 DAS. However, higher weed density observed for entire the crop season brought 49 percent decline in seed yield under unweeded plot. Among the various weed control measures, pendimethalin @ 1 kg ha-1 on 3 DAS followed by acifluorfen sodium (16.5%) + clodinafop propargyl (8% EC) @ 187.5 g/ha on 20 DAS may possibly able to control weed menace which in turn increased weed control efficiency as well as yield and benefit-cost ratio for the irrigated blackgram.