Re-visiting of nitrogen and sulphur requirements in Indian mustard {Brassica juncea} under irrigated conditions

摘要

Present study was carried out during 2018-19 and 2019-20 at ICAR-Directorate of Rapeseed-Mustard Research, Bharatpur, Rajasthan to evaluate the effect of nitrogen (N) and sulphur (S) nutrition on production efficiency, water productivity, and economics of Indian mustard Brassica juncea (L.) Czem Coss. under irrigated conditions. The experiment was conducted in a split plot design with 5 nitrogen levels (0, 60, 80, 100 and 120 kg/ha) as the main plot treatment and 4 sulphur levels (0, 20,40, and 60 kg/ha) as subplot treatment with 3 replications. Results revealed that the application of 120 kg N/ha recorded the highest plant height (205 cm), leaf area index (5.4), number of leaves/ plant (47.3), primary branches/plant (6.8), secondary branches/plant (18.9), SCMR (46.5), number of siliquae/plant (382), number of seeds/silique (18), stem girth (6.65 cm), test weight (5.79 g) and seed yield (3.04 t/ha). Among the different S levels, the maximum values of growth and physiological parameters, yield attributes and seed yield were recorded at 60 kg S/ha (2.71 t/ha). Similarly, production efficiency (22.1 kg/ha/day) and water productivity (1.53 kg seed/m~2) were found higher than 120 kg N/ha and 60 kg S/ha. The highest net monetary returns and Benefitcost (B: C) ratio were recorded with 120 kg N/ha and 60 kg S/ha.Thus, the application of N and S may be revised to 120 and 60 kg/ha, respectively for Indian mustard in the irrigated semi-arid climates to achieve higher productivity, efficiency and profitability.