Effect of Different Application of Nitrogen Fertilizer on Soil Nitrate Nitrogen during Growth of Maize

Use 'Zhengdan 958' as the material,explore different nitrogen application to the next 0～60 cm of soil nitrate during the spring maize content changes,the results show that :0～40 cm soil layer,the layer of soil nitrogen increased the nitrate content of,and influenced by nitrogen;20～40 cm soil layer,and non-nitrogen than the nitrogen affects the growth period of corn late in the layer of soil nitrate content is higher than in the August 18 deal with non-nitrogen;40～60 cm layer of soil nitrate content prior to July 20 there is no significant effect by the nitrogen in the silking stage after the impact of nitrogen by the large nitrate nitrogen affected the grain filling stage of content.