%0 Journal Article
%T Appropriate soil nitrate N content for a winter wheat/summer maize rotation system in North China Plain<br>华北平原冬小麦/夏玉米轮作体系土壤硝态氮的适宜含量
%A CUI Zhen-ling
%A CHEN Xin-ping
%A ZHANG Fu-suo
%A XU Jiu-fei
%A SHI Li-wei
%A LI Jun-liang
%A <br>崔振岭
%A 陈新平
%A 张福锁
%A 徐久飞
%A 石立委
%A 李俊良
%J 应用生态学报
%D 2007
%I 
%X A field experiment with 12-level N fertilization in winter wheat growth season and zero-N in summer maize growth season was conducted to study the appropriate soil nitrate N content for a winter wheat/summer maize rotation system in North China Plain. The results showed that when the soil mineral N content before sowing was higher, a split application of 150 kg N x hm(-2) in winter wheat growth season could meet the N demand of both winter wheat and summer maize in the rotation system. The N use efficiency of winter wheat in different N treatments was only from 11% to 23%, while the residual N use efficiency of summer maize ranged from 30% to 52%. When the nitrate N content in top 90 cm soil layer before maize sowing was up to 82 and 151 kg x hm(-2), respectively, the N demand of summer maize at its ten-leaf stage and in its whole growth season could be met with no N application. However, when the nitrate N content in top 90 cm soil layer was less than 46 and 65 kg x hm(-2) at maize ten-leaf stage and after harvest, respectively, no N application could impact maize growth, and decrease its grain yield. With the maize yield and environmental protection considered comprehensively, the nitrate N content in top 90 cm soil layer should be maintained at an appropriate level from 65 to 151 kg x hm(-2) during maize growth season.
%K N use efficiency
%K residual N use efficiency
%K soil nitrate N content
%K N loss<br>氮肥利用率
%K 氮肥残效利用率
%K 土壤硝态氮含量
%K 氮素损失
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=F54741114238FBF5&yid=A732AF04DDA03BB3&vid=13553B2D12F347E8&iid=F3090AE9B60B7ED1&sid=D80D149F88BBF67B&eid=9FC5A7BC6F92B63D&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=18