Vol. 10, Issue 7 (2021)

Author(s):
Deepika Painkra, DK Gupta, AK Sinha, AK Paliwal, N Chouksey and Sashank Kumar Singh

Abstract:
A field experiment was conducted to study the effective weed management strategy for blackgram (Vigna mungo L. Hepper) under north hill situation of Chhattisgarh at Rajmohini Devi College of Agriculture and Research Station, Ambikapur, IGKV, Raipur, Chhattisgarh during kharif, 2020. The experiment was laid out in randomized block design with three replication having seven treatment viz., T₁: weedy check, T₂: two hand weeding at 15 and 30 DAS, T₃: oxyfluorfen @ 120 a.i./ha as pre emergence T₄: quizalifop-p-ethyl @ 37.5 g a.i./ha as post emergence, T₅: oxyfluorfen @ 120 g a.i./ha as pre emergence fb imazethapyr @ 40 g a.i./ha as post emergence, T₆: oxyfluorfen @ 120 g a.i./ha pre emergence fb quizalifop-p-ethyl @37.5 g a.i./ha as post emergence and T₇: imazethapyr @ 40 g a.i./ha + quizalifop-p-ethyl @37.5 g a.i./ha as post emergence. Among herbicide weed control treatments, the lowest weed density and dry matter, highest yield attributes and seed yield was recorded with two hand weeding at 15 and 30 DAS and it was statistically at par with, oxyfluorfen @ 120 g a.i./ha pre emergence fb imazethapyr @ 40 g a.i./ha as post emergence, oxyfluorfen @ 120 g a.i./ha pre emezethapyr fb quizalifop-p-ethyl @ 37.5 g a.i./ha as post emergence and imazethapyr @ 40 g a.i./ha + quizalifop-p-ethyl @ 37.5 g a.i./ha as post emergence. Maximum net return and B:C ratio was recorded with oxyfluorfen @ 120 g a.i./ha pre emergence fb imazethapyr @ 40 g a.i./ha as post emergence and it was statistically at par with, oxyfluorfen @ 120 g a.i./ha pre emergence fb quizalifop-p-ethyl @37.5 g a.i./ha as post emergence, imazethapyr @ 40 g a.i./ha + quizalifop-p-ethyl @37.5 g a.i./ha as post emergence and with two hand weeding at 15 and 30 DAS. All herbicide treatments reduced weed biomass and improved seed yield and yield attributing parameters as compared to weedy check. Weedy check registered the highest value of weed count and biomass and lowest seed yield and yield attributing characters.