Field experiments were carried out to study the effects of nitrogen(N) application rate on rape-seed yield,post-anthesis dry matter translocation and N fertilizer use efficiency under delayed sowing condition in Jiangxi Province during 2011—2012.The result showed that N application significantly improved the yield and profit of rapeseed compared with no N application.However,when the N application rate exceeded 180 kg/hm2 , its yield-increasing effect was not significant,its profits,dry matter translocation efficiency and contribution of dry m...