To investigate the effects of weed management practices on the dynamics of the weeds, the WCE, the WI, and the performance of Indian mustard [Brassica juncea (L.) Czern & Cosson] during the Rabi season 2017-18, an experiment was conducted at the Narendra Deva University of Agriculture and Technology's Agronomy Research Farm in Kumarganj, Ayodhya. The experiment comprised of nine treatments, viz., T1-weedy check; T2-one hand weeding at 30 DAS; T3-two hand weeding at 20 and 40 DAS; T4-Pendimethalin (PE) 1.00 ai kg ha-1 ; T5-Oxyflorafen (PE) 1.00 ai kg ha-1; T6-Isoproturan (PE) 1.00 ai kg ha-1; T7-Pendimethalin (PE) 1.00 ai kg ha-1 + One-handed weeding at 30 DAS; T8-Oxyflorafen (PE) 1.00 ai kg ha-1+ One-handed weeding at 30 DAS and T9-Isoproturan (PE) 1.00 ai kg ha-1+ One-handed weeding at 30 DAS was evaluated in a Randomized Block Design with three replications. In the results of this study, we found that the crop was infested with five different kinds of weed flora. Among these were Phalaris minor and Cynodon dactylon which were the dominant grass weeds. In total, 26.7% of the total weed flora of the region was composed of broadleaved weeds (C. album and Anagallis arvensis). In the total weed flora of the park, the sedge (Cyperus rotandus) constituted 26.7% of the total weed flora, followed by other weeds. A variety of weed management practices were tested. Under treatment involving two-hand weeding at 20 and 40 DAS, weed index (WI), weed intensity reduction, dry matter reduction, and nitrogen uptake were found to be the best weed control efficiency, weed index (WI), and weed reduction. Pendimethalin (PE) was applied at 1.00 kg/ha plus one hand weeding was done at 30 DAS. It is therefore possible to conclude that weeding with both hands at 20 and 40 days of acorn cultivation and fallowing with pendimethalin (PE) @ 1.00 kg/ha together with one-handed weeding at 30 days of acorn cultivation may be a better approach to reduce weed density in mustard crops and to improve their productivity.