A field experiment was conducted at Agricultural Research Farm, Narayan Institute of Agricultural Sciences, Gopal Narayan Singh University, Jamuhar, Sasaram, Rohtas, (Bihar) during the Rabi season of 2022-2023 to access the effect of different varieties and spacing on growth and yield of mustard. Treatment consisted of three varieties RH- 404, DRMR-1165-40 and NRCM-101 and three spacing viz. 30×10 cm, 40×10 cm and 50×10 cm. Present Experiment was conducted under randomized block design with three replications. The result of experiment showed that growth viz, plant height and dry weight and yield attributes viz., number of seeds/siliqua, biological yield (Kg/ha) and economics viz., cost of cultivation (Rs/ha), gross return (Rs/ha), net return (Rs/ha) and B:C ratio and yield were significantly affected due to different varieties and spacing. The maximum plant height (165.72 cm), dry weight (35.32 g/plant), number of seeds/siliqua (15.97), gross return (124623.3 Rs/ha), net return (74004.5 Rs/ha) and B:C ratio of (1.48) was found in treatment combination of NRCM-101 + 40 cm × 10 cm. However treatment combination of DRMR-1165-40 + 30 cm × 10 cm recorded maximum biological yield (6665.37 kg/ha).
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