Nitrogen and Phosphorus Addition to Soil Improves Seed Yield, Foliar Stomatal Conductance, and the Photosynthetic Response of Rapeseed (Brassica napus L.)

The effects of nitrogen and phosphorus levels on the physiological traits, yield, seed yield rapeseed (Brassica napus L.), were studied in a farm research project Zanjan University. Three (0, 100, 200 kg/ha) three 75, 150 considered. results showed that an increase level caused leaf chlorophyll content so application kg/ha increased leaves until mid-grain filling stage. Nitrogen lowered stomatal conductance early flowering stage whereas was during late (100 also quantum photosystem II. On other hand, with 75 phosphorus, II respectively. significantly oil compared to control. In addition, number siliques per plant weight 1000 seeds increasing trend affected by levels. This study demonstrated enhanced content, area, consequently, augmented duration, gas exchange. As result, 100 together greatest effect qualitative quantitative rapeseed. However, alone or combination different did not many traits.