Effects of Nitrogen Application Rate on Yield,Profit and Nitrogen Absorption and Utilization of Rapeseed under Delayed Sowing Condition in Jiangxi Province
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 matter translocation amount to grain decreased significantly.The agronomic nitrogen use efficiency( ANUE)did not reach 0.05 level in N150,N120 and N90 treatments,but the agronomic nitrogen use efficiency( ANUE) reached 0.05 lever between N150 and N180,N210 and N240 treatment,the agronomic nitrogen use efficiency ( ANUE) in N150 treatment was significantly higher than that in N180,N210 and N240 treatments.Based on rapeseed yield,profit and nitrogen use efficiency,the optimum N fertilizer application rate was 150-180 kg/hm2 under delayed sowing condition in Jiangxi Province.
rapeseednitrogen application rateyieldprofitnitrogen use efficiency
国家科技期刊平台
NSTL
万方数据
维普
