Effect of Fertilizer Application on Winter Wheat Yield and Nitrate-N Accumulation in Soil

A field experiment was conducted to study the effects of different nitrogen application on Winter Wheat yield,nitrogen use efficiency and nitrate-N accumulation in sandy soil.Under optimized fertilization,total N application reduced 30% than conventional fertilization and phosphatic and potassic fertilizer application were not changed.The result showed that the difference of winter wheat yield was not significant between optimized and conventional fertilizing application.Nitrogen use efficiency of Winter Wheat was increased by 5.25%-10.02% significantly for the optimized fertilization than for conventional fertilization.And the remains of NO-3-N in 0-120 cm soil layer were decreased by 66.87,98.87,66.61,42.01 kg/ha under optimize fertilization,optimizing fertilization + organic manure,straw counters-field + optimization fertilization,slow accused of fertilizer than under conventional fertilization respectively.