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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) and Seed rates (3, 6 and 9 kg ha). Seed rates resulted in maximum emergence (55 m), plant height (147 cm), thousand grains weight (3.4 g) and grain yield (2026 kg ha) were recorded with seed rate of 9 kg ha while minimum days to maturity (155), maximum oil content (45%), Absolute growth rate (AGR) (7.4 g m day), grain nitrogen content (2.6 %) and straw nitrogen content (1.5 %) were recorded with the seed rate of 3 followed by 6 kg ha. Except emergence, nitrogen performed better and maximum plant height (147 cm), 1000 grains weight (3.5 g), grain yield (2211 kg ha), Absolute growth rate (AGR) (10.3 g m day), Nitrogen content in grain (2.7 %) and nitrogen content in straw (1.6 %) were achieved with 100 kg N ha while minimum days to maturity (155) and grain oil content (44%) were obtained with 50 kg N ha. Grain yield and oil content of canola increased with seed rate 6 kg followed by 9 kg ha while 100 & 50 kg N ha enhanced grain yield & oil content.

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