Study on Nitrogen Uptake,Transformation and Accumulation in Winter Wheat under Different Fertilization

One-year field experiment from 2008 to 2009 was conducted to study nitrogen uptake,transformation and accumulation in winter wheat(Xiaoyan 22) under different fertilization,which was aimed to provide a theory for N application of winter wheat in Guanzhong area of Shaanxi Province.The results showed that wheat grain yield increased significantly when nitrogen,phosphorous and potassium were applied with organic fertilizer.When organic N rate was 150 kg·hm-2 and chemical N rate ranged from 150 to 225 kg·hm-2,wheat grain yield reached 9000 kg·hm-2,which was higher than that of conventional fertilization.When N rate was between 270 and 300 kg·hm-2 without organic fertilizer,the difference of wheat grain yield was not significant compared with conventional fertilization,which indicated that organic fertilizer had great effect on the increase of yield.Fertilization had significant effects on N accumulation.N accumulation amount increased significantly when N,P and K were applied to wheat compared with conventional fertilization.N accumulation amount ranged from 249.3 to 283.0 kg·hm-2 when N,P and K were incorporated with organic fertilizer.N accumulation amount in the middle and later growth stages and N transformation amount of nutritional organ after anthesis increased when N,P and K were applied to wheat compared with conventional fertilization.In conclusion,in order to get high wheat grain yield,the recommended N application rate in Guanzhong area of Shaanxi province was from 150 to 225 kg·hm-2,which should be applied with P,K and organic fertilizer.