pandey, I. B.Kumar, Randhir2018-08-032018-08-032018http://krishikosh.egranth.ac.in/handle/1/5810063173A field experiment was conducted during summer season of 2017 at research farm of Tirhut College of Agriculture, Dholi (Muzaffarpur) to study the “Effect of plant geometry and weed management on weed dynamics and yield of summer mungbean (Vigna radiata L.)”. The experiment was laid out in randomized block design and replicated thrice. The treatment comprised, three plant geometry i.e.,20 x 10 cm, 25 x 10 cm and 30 x 10 cm and five weed management practices i.e.,weedy check, hand weeding at 15 and 30 DAS, Pendimethalin 0.75 kg/ha (pre-emergence), Quizalofop-ethyl 60 g/ha at 15 DAS and Imazethapyr 60 g/ha at 15 DAS. Significantly higher plant height and crop growth rate were recorded at closer row spacing of 20 × 10 cm than wider row spacing at harvest. However, higher dry matter accumulation/plant, number and dry weight of nodules per plant and number of pods/plant were significantly higher at wider row spacing of 30 × 10 cmover closer row spacings. Number of pods per plant, pod length and test weight were not significantly influenced by plant geometry. Among weed management practices, hand weeding twice recorded significantly higher plant height, dry matter production/plant, crop growth rate, number and dry weight of nodules/plant, pod/plant, grains/pod and pod length than Quizalofop-ethyl and Pendimethalin Closer row spacing of 20 × 10 cm recorded significantly higher grain yield but was found at par with row spacing of 25 × 10 cm and significantly higher over wider row spacing of 30 × 10 cm. Similarly closer row spacing of 20 × 10 cm also recorded significantly higher straw yield than wider row spacings. Hand weeding twice although produced higher grain yield but was at par with Imazethaypr and significantly surpassed over Quizalofop-ethyl and Pendimethalin. Harvest index was unaffected by plant geometry and weed management practices. Closer row spacing reduced weed count and weed dry biomass than wider row spacing but could not reach to the level of significance. Imazethaypr was found equally effective for reducing the weed count and weed density than hand weeding twice closely follwed by Quizalofop-ethyl. Significantly higher NPK-uptake by the crop and lower NPK-depletion by weeds were recorded under closer row spacing of 20 × 10 cm than wider row spacings. Similarly, hand weeding twice recoded significantly higher NPK uptake by crop and lowered NPK-depletion by weeds than chemical weeding except K- uptake.Protein content in grain was not significantly influenced by planting geometry and weed management practices. Closer row spacing of 20 × 10 cm recorded significantly higher gross returns, net returns and B: C ratio than wider row spacing of 25 × 10 cm and 30 × 10 cm. Among the weed management practices, hand weeding twice recorded significantly higher gross returns while the highest net return and B: C ratio were associated with Imazethapyr.ennullThesis