Abstract: Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil NO₃^- were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil NO₃^- were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil NO₃^- were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil NO₃^- was decreased.According to the amount of NO₃^--N in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^- leaching,so it was very easy to seep into groundwater and pollute the environment.was decreased.According to the amount of NO₃^- in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^--N leaching,so it was very easy to seep into groundwater and pollute the environment.was decreased.According to the amount of NO₃^- in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^- leaching,so it was very easy to seep into groundwater and pollute the environment.were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil NO₃^- was decreased.According to the amount of NO₃^- in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^- leaching,so it was very easy to seep into groundwater and pollute the environment.

Key words: Winter wheat, Soil, NO₃^--N, Content, Distribution

CLC Number: 

• S143.01