Panwar, G.S.Dubey, Shikha2021-02-182021-02-182020-10-31Dubey Shikha 2020. Studies on Herbicidal Weed Management in Black gram [Vigna mungo (L.) Hepper] M.Sc. Thesis. 77 p.https://krishikosh.egranth.ac.in/handle/1/5810161337A field experiment entitled “Studies on herbicidal weed management in black gram [Vigna mungo (L.) Hepper]” conducted during kharif 2019 at Research block, Banda University of Agriculture and Technology, Banda (UP). The experiment was laid out in Randomized Complete Block Design with three replications. The weed control treatments were: T1 (Imazethapyr @ 70g a.i/ha PE), T2 (Imazethapyr @ 80g a.i./ha PE), T3 (imazethapyr @ 70g a.i./ha at 3-4 leaf stage), T4 (Imazethapyr @ 80g a.i./ha at 3-4 leaf stage), T5 (imazethapyr + imazamox RM @ 70g a.i./ha PE), T6 (Imazethapyr + imazamox RM @ 80g a.i./ha PE), T7 (imazethapyr + imazamox RM @ 70g a.i./ha 3-4 leaf stage), T8-Imazethapyr + imazamox RM @ 80g a.i./ha 3-4 leaf stage), T9 (pendimethalin @ 1000g), T10 (imazethapyr + pendimethalin RM @ 1000g PE), T11(sodium aciflurfen 16.5%+ clodinafop proparygyl 8EC 1000 ml POE), T12 (Hand Weeding twice 15 and 30 DAS), T13(weedy check (control), T14(Weed free). The experiment was conducted to find out the cost-effective herbicide for controlling weeds and to fine tune the dose of herbicide with the impact of weed management practices on growth and yield of black gram. Application of imazethapyr + pendimethalin RM @ 1000g PE and imazethapyr + imazamox RM @ 70g a.i./ha 3-4 leaf stage significantly influence all growth parameters among herbicidal treatments. The maximum value of plant growth parameters viz plant height, branches per plant, number of leaves, dry matter accumulation, root length, leaf area index were associated with weed free treatments followed by (hand weeding twice at 15 & 30 DAS at 60 DAS. The maximum values of yield attributing characters viz. number of pods plant-1, pod length, grains/pod and 100 seed weight were recorded in weed free treatments. Among the herbicidal treatments the maximum values of yield attributes were observed in imazethapyr + imazamox RM @ 70g a.i./ha 3-4 leaf stage. The seed yield of black gram was maximum under weed free conditions (12.4 q/ha) followed by hand weeding twice. Among the herbicidal treatment, application of imazethapyr + imazamox RM @ 70g a.i./ha 3-4 leaf stage yielded highest seed yield to the tune of 11.34 q/ha which was significantly superior over rest of the treatments. In case of weed density, weed dry weight and weed control efficiency application of imazethapyr + imazamox RM @ 80g a.i./ha 3-4 leaf stage proved superior over others and recorded minimum weed density, weed dry matter per square meter area with maximum weed control efficiency which was closely followed by PoE of imazethapyr + imazamox RM @ 70g a.i./ha. The density of total weed was lowest in hand weeding twice at both the stages of observation. Among the herbicidal treatment lowest weed density was observed with the application of imazethapyr + imazamox RM @ 80g a.i./ha 3-4 leaf stage which remains at par with PoE of imazethapyr + imazamox RM @ 70g a.i./ha. Uncontrolled weeds reduced the grain yield of black gram by 61.29%. Among herbicidal treatments minimum yield loss to the tune of 8.51% was observed with the application of imazethapyr + imazamox RM @ 70g a.i./ha 3-4 leaf stage followed by sodium aciflurfen 16.5%+ clodinafop proparygyl 8EC 1000 ml POE (10.24%), higher net return and benefit cost ratio (2.06) was obtained with postemergence application of imazethapyr + imazamox RM @ 70g a.i./ha 3-4 Leaf stage. Field study reveals that post emergence application of imazethapyr + imazamox RM @ 70g a.i./ha was found effective in managing weeds and higher monetary benefits.EnglishThesis