Vol. 9, Special Issue 9, Part J (2025)

A field experiment was carried out during Rabi season- 2024, at crop research farm of Department of Agronomy at Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj (U.P.) India. The experiment was entitled as “Effect of Phosphorus Level and Spacing on growth and yield of Mustard (Brassica juncea L.)”. The experiment was laid out in randomized block design (RBD) which consisted of ten treatment and replicated thrice viz. T1: Phosphorus 30 kg/ha + Spacing 25 cm × 15 cm, T2: Phosphorus 30 kg/ha + Spacing 35 cm × 15 cm, T3: Phosphorus 30 kg/ha + Spacing 45 cm × 15 cm, T4: Phosphorus 40 kg/ha + Spacing 25 cm × 15 cm, T5: Phosphorus 40 kg/ha + Spacing 35 cm × 15 cm, T6: Phosphorus 40 kg/ha + Spacing 45 cm × 15 cm, T7: Phosphorus 50 kg/ha + Spacing 25 cm × 15 cm, T8: Phosphorus 50 kg/ha + Spacing 35 cm × 15 cm, T9: Phosphorus 50 kg/ha + Spacing 45 cm × 15 cm, and Control Plot. The application of 50 kg/ha phosphorus combined with a spacing of 25 cm × 15 cm (Treatment 7) resulted in significantly higher growth and yield parameters, including maximum plant height (196.96 cm), highest plant dry weight (19.31 g/plant), greater number of branches per plant (16.33), increased number of seeds per siliqua (17), more siliquae per plant (297.33), as well as the highest seed yield (2.15 t/ha) and stover yield (4.97 t/ha).