Field experiments were conducted at Tamil Nadu Rice Research Institute, Aduthurai, Thanjavur district, Tamil Nadu, India to evolve efficient and economic weed management practices for irrigated blackgram during Kharif (rainy season) 2018 and winter 2018-19. The results revealed that pre-emergence application of pendimethalin1.0 kg/ha on 3 DAS fb acifluorfen-sodium (16.5%) + clodinafop-propargyl (8% EC) 187.5 g/ha on 20 DAS effectively reduced weed density and dry matter production. Consequently, higher seed yields of 1.05 and 1.01 t/ha in the Kharif and winter seasons were recorded, respectively. The increase was 15.2, 78.7, and 9.2, 86.9% over hand weeding twice, unweeded check in Kharif and winter seasons, respectively. Among the treatment combinations, adoption of pendimethalin fb acifluorfen-sodium + clodinafop-propargyl on 20 DAS had highest gross return ( 64,234 and 72,383/ha), net return ( 37,374 and 44,722/ha) and B:C (2.39 and 2.62) during Kharif and winter seasons, respectively. Hence, this weed management practice could be a viable and cost effective in irrigated blackgram for enhancing production and productivity of blackgram.