Singh, IshwarBORANA, HITESHRam, MoolaShukla, U.N.2021-12-042021-12-042019-07-26Borana Hitesh 2019. Effect of Weed Management Practices on Growth and Yield of Clusterbean [Cyamopsis tetragonoloba (L.) Taub] M.Sc. thesis, College of Agriculture, Agriculture University Jodhpurhttps://krishikosh.egranth.ac.in/handle/1/5810178610A field experiment was conducted at Agricultural Research Station, Mandor, Agriculture University, Jodhpur during kharif season of 2018 to study the “Effect of Weed Management Practices on Growth and Yield of Clusterbean [Cyamopsis tetragonoloba (L.) Taub]”. The Field experiment was laid out in randomized block design (RBD) with ten treatments of replicated thrice. The treatments comprises of W1-Weedy Check, W2-Weed free, W3-Pendimethalin 750 g ha-1 (PE), W4- Imazethapyr 40 g ha-1 (Early post-emergence), W5-Pendimethalin + imazethapyr 750 g ha-1 (PE), W6-Imazethapyr + imazamox 50 g ha-1 (Early post-emergence), W7- Pendimethalin 750 g ha-1 (PE) + one hand weeding at 25 DAS, W8-Imazethapyr 40 g ha-1 (Early post-emergence) + one hand weeding at 35 DAS, W9-Pendimethalin + imazethapyr 750 g ha-1 (PE) + one hand weeding at 25 DAS, W10-Imazethapyr + imazamox 50 g ha-1 (Early post-emergence) + one hand weeding at 35 DAS. According to treatments, pendimethalin and its ready mix with imazethapyr was applied as pre-mergence (within 2 DAS), while imazethapyr and its ready mix with imazamox was applied as early post-emergence (20 DAS). Among treatments, application of imazethapyr + imazamox 50 g ha-1 (early post-emergence) + one hand weeding at 35 DAS significantly reduced weed density of narrow and broad-leaved weeds and weed dry matter at 40, 60, 80 DAS and at harvest however, it was found at par with imazethapyr 40 g ha-1 (early post emergence) + one hand weeding at 35 DAS. Similarly, higher weed control efficiency was also obtained under these treatments which resulted in reduction of weed index as well.The plant height, no. of branches plant-1, dry matter accumulation (g plant-1) as well as yield attributing characters viz., no. of pods plant-1, no. of seeds pod-1 and 1000-seed weight of clusterbean were produced significantly higher under application of imazethapyr + imazamox 50 g ha-1 (early post-emergence) + one hand weeding at 35 DAS. Due to better growth, higher number of yield attributes and less weed index, this treatment resulted in maximum seed yield of 1180 kg ha-1 which was statistically at par with weed free season long plot (1237 kg ha-1). Application of imazethapyr 40 g ha-1 (early post-emergence) + one hand weeding at 35 DAS produced seed yield of 1120 kg ha-1 which was statistically at par with imazethapyr + imazamox 50 g ha-1 (early post-emergence) + one hand weeding at 35 DAS (1180 kg ha-1). The highest amount of total nitrogen uptake by crop (112.1 kg ha-1) was recorded with weed free treatment which remained at par with imazethapyr + imazamox 50 g ha-1 + one hand weeding at 35 DAS (106.5 kg ha-1). The lowest amount of nitrogen removal by weeds (22 kg ha-1) was obtained with the application of imazethapyr + imazamox 50 g ha-1 + one hand weeding at 35 DAS followed by imazethapyr 40 g ha-1 + one hand weeding at 35 DAS. The highest net monetary return and B:C ratio of 49,693 and 3.23 were obtained with imazethapyr + imazamox 50 g ha-1 (early post-emergence) + one hand weeding at 35 DAS, respectively followed by imazethapyr 40 g ha-1 (early post emergence) + one hand weeding at 35 DAS.EnglishThesis