Analysis of yield traits, oil content and protein concentration in canola (Brassica napus L.) in relation to various nitrogen and seed rates

Nitrogen plays an important role in protein formation, cell improvement, protoplasm and other photosynthetic activities.Therefore, a field study was conducted at Bacha Khan Agricultural Research Farm, Bacha Khan University, Charsadda, during 2015-2016.The experiment was laid down according to Randomized Complete Block design (RCBD) having three replications with plot size of 1.5m x 4m.Two factors were studied, i.e.Nitrogen levels (0, 50, 75 & 100 kg ha -1 ) and Seed rates (3, 6 and 9 kg ha -1 ).Seed rates resulted in maximum emergence (55 m -2 ), plant height (147 cm), thousand grains weight (3.4 g) and grain yield (2026 kg ha -1 ) were recorded with seed rate of 9 kg ha -1 while minimum days to maturity (155), maximum oil content (45%), Absolute growth rate (AGR) (7.4 g m -2 day -1 ), grain nitrogen content (2.6 %) and straw nitrogen content (1.5 %) were recorded with the seed rate of 3 followed by 6 kg ha -1 .Except emergence, nitrogen performed better and maximum plant height (147 cm), 1000 grains weight (3.5 g), grain yield (2211 kg ha -1 ), Absolute growth rate (AGR) (10.3 g m -2 day -1 ), Nitrogen content in grain (2.7 %) and nitrogen content in straw (1.6 %) were achieved with 100 kg N ha -1 while minimum days to maturity (155) and grain oil content (44%) were obtained with 50 kg N ha -1 .Grain yield and oil content of canola increased with seed rate 6 kg followed by 9 kg ha -1 while 100 & 50 kg N ha -1 enhanced grain yield & oil content.