In order to investigate the physiological mechanism of nitrogen use efficiency（NUE） of oilseed rape,sand experiments were used to study the influences of photosynthesis and dry matter accumulation of three different oilseed rape cultivars on nitrogen use efficiency at seedling stage,flowering stage and podding stage under two supply levels of nitrogen.The results showed that under the nitrogen threatening,the photosynthetic rate of different oilseed rape cultivars at seedling stage and podding stage had large impact on NUE,while the dry matte...
