Response of Rapeseed to Nitrogen and Sulphur

An experiment was conducted to investigate the response of rapeseed to nitrogen and sulphur at the Research Farm of the College of Agriculture, Central Agricultural University, Imphal during rabi seasons of 1990–2000 and 2000–2001 on a clayey soil. Treatments consisted of three levels of nitrogen (0, 40 and 60 kg ha⁻¹) and three levels of sulphur through gypsum (0, 20, 40 kg ha⁻¹). Application of 60 kg N ha⁻¹ produced the highest seed (1.18 t ha⁻¹) and straw (1.69 t ha⁻¹) yield of rapeseed. Oil content in seed increased significantly with the addition of nitrogen (60 kg ha⁻¹) and sulphur (40 kg ha⁻¹). Total N uptake by rapeseed progressively increased from 39.6 to 72.6 kg ha⁻¹ with the increase in N levels. The uptake of sulphur increased with sulphur application up to 40 kg S ha⁻¹. Uptake of P and K by rapeseed increased with graded levels of nitrogen and sulphur.