Abstract:OBJECTIVETo study the characteristics of nitrogen absorption and utilization of rapeseed僾 (Brassica napus. L.) with different types of seed yield.METHODUnder different soil fertility conditions, 73 and 98 conventional rapeseed cultivars were cultured in 2006-2007 and 2007-2008, respectively. Through testing dry matter weight and the nitrogen content of different organs, The tested rapeseed cultivars were classified into 6 types based on seed yield by the MinSSw method, to study their characteristics of nitrogen accumulation and distribution.RESULTSThe results indicated that difference of seed yield in different types varied significantly. With increasing of seed yield, the total nitrogen amount of plant and nitrogen utilization efficiency for grain production increased. With increasing of seed yield, the nitrogen accumulation amount of seed increased, the ratio of nitrogen accumulation of stem and branches and shell to total nitrogen amount of plant reduced, and the ratio of nitrogen accumulation of seed to total nitrogen amount of plant increased. With increasing of soil fertility, the total amount of nitrogen accumulation increased, but the nitrogen utilization efficiency for grain production induced.CONCLUSIONTo get high seed yield and high nitrogen utilization efficiency in rapeseed production, increasing the total nitrogen amount of plant and making nitrogen translocate from nutritious organs to seed.