Effects of nitrogen fertilizer on yield and yield components of two cultivars of canola (Brassica napus L.) in West of Golestan

In order to evaluate the effect of nitrogen on agronomic characteristics, yield components and yield of two cultivars of canola, a factorial experiment base on randomized complete block design with 4 replications was conducted in the city of Bandar Gaz. Seven levels of nitrogen (without nitrogen, 25, 50, 75, 100, 125 and 150 kg of nitrogen per hectare) and two canola cultivars 401 and RGS003 as a factorial combined and formed 14 treatments. The results showed that nitrogen fertilizer had significant effects on days to flowering, duration of flowering, days to maturity, plant height, the stem height, yield components and yield of canola. Nitrogen fertilizer to a certain extent increased the yield and then decreased yield. The highest grain yield of hybrid Hyola401 and the lowest yield was RGS003. Treatment with 100 kg N/ha with grain yield 2245 kg /ha is highest and treatment of 25 kg nitrogen per hectare with 1718 kg/ha is lowest. The results showed that the addition of nitrogen fertilizer can increase grain yield.