A field experiment was conducted during the kharif season of 2019 at Research Farm of Tirhut College of Agriculture, Dholi (Muzaffarpur) to study the performance of weed management practices in growth, yield and economics of sesame (Sesamum indicum L.) under sandy loam soil of north Bihar. The experiment was laid out in randomized block design with eight treatments and replicated thrice. Weed management practices had significant effect on growth and yields parameters of sesame crop. The weed management practices showed their effectiveness in increasing in growth and yield attributing characters viz., plant height, dry matter production, crop growth rate, number of capsules/plant, length of capsules, number of seeds/capsule, 1000-seed weight. Significantly higher plant height was observed under pre-emergence application of pendimethalin @1000 g/ha + post-emergence application of quizalofop-p-ethyle @50 g/ha at 25 DAS (T₇). The dry matter accumulation and crop growth rate was significantly higher under pre-emergence application of pendimethalin @1000 g/ha + hand weeding at 30 DAS (T₆) at 60 DAS, 90 DAS and at harvest, but both the parameters were found non-significant at 30 DAS. Number of capsules/plant was significantly influenced by different weed management practices. However, length of capsules, number of seeds/capsule and 1000-seed weight were not significantly influenced by weed management practices. Pre-emergence application of pendimethalin @1000 g/ha + hand weeding at 30 DAS recorded significantly higher grain yield, straw yield and harvest index.Among the different weed management practices, pre-emergence application of pendimethalin @1000 g/ha + hand weeding at 30 DAS (T₆) recorded significantly higher gross return than other treatments but was found equally good with hand weeding at 30 DAS (T₂) and combined application of pendimethalin @ 1000 g/ha as pre-emergence followed by post-emergence application of quizalofop-p-ethyle @ 50 g/ha at 25 DAS (T₇) but significant higher net return was worked out in combined application of pendimethalin @ 1000 g/ha as pre-emergence followed by post-emergence application of quizalofop-p-ethyle @ 50 g/ha at 25 DAS (T₇) and was found equally good with one hand weeding at 30 DAS (T₂). However, benefit : cost ratio was significantly superior in the treatment of combined application of pendimethalin @ 1000 g/ha as pre-emergence followed by post-emergence application of quizalofop-p-ethyle @ 50 g/ha at 25 DAS (T₇) than all other weed management practices.

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