Effect of nitrogen and sulphur on growth, yield and nutrient uptake by Indian mustard (Brassica juncea) under rainfed condition

Abstract

A study was conducted during winter (rabi) seasons of 2003-05 to find out the response of Indian mustard to four levels of nitrogen (0,40, 60 and 80 kg N/ha) and four levels of sulphur (0,15,30 and 45 kg S/ha) under rainfed conditions. Application of 80 kg N/ha significantly improved seed yield (1.27 t/ha), stover yield, nitrogen uptake (55.9 kg/ha), protein content and oil content, probably due to better crop growth and yield attributes of Indian mustard. Among the sulphur level, 45 kg S/ha being on par with 30 kg S/ha gave significantly higher seed yield (1.25 tonnes/ha), stover yield, sulphur uptake (20.7 kg/ha) and oil and protein content. Agronomic efficiency and apparent recovery was maximum at 60 kg N/ha and 15 kg S/ha, and it declined with further increases in the levels of nitrogen and sulphur. Optimum economic dose of nitrogen 39.5 - 46.3 kg/ha and 24.5 kg S/ ha. Maximum net returns and benefit : cost ratio were observed with the application of 80 kg N and 45 kg S/ha, respectively.