Effect of different levels and methods of nitrogen application on growth and yield of rapeseed (brassica cam pestris l.)

Abstract

Six levels of nitrogen (0, 30, 60, 90, 120 and 150 kg/ha) and five methods of N application (entire quantity as basal, 50% as basal + 50% as top dressing, 50% as basal + 50% foliar, 70% as basal + 25% as foliar and entire quantity as foliar) were tested on rapcsced cultivar (Kalyania). Nitrogen above 60 kg/ha gave significantly higher plant height, number of primary branches and pods per plant, seed and oil yields and stover yield; while 1000 seed weight remained unaffected and oil content decreased with the increase of nitrogen levels. Nitrogen applied at 50 to 75% as basal and rest amount as foliar were found to be the best methods of N application in all respect except oil content in seed. All the yield attributes were significantly influenced by the interaction of all levels and methods of N application. Nitrogen levels (90-120) kg/ha) when applied 75% as basal and rest amount as foliar at 22 DAS resulted significantly higher seed and oil yiclds/ha.