%0 Journal Article
%T Effect of nitrogen application time on dynamics of nitrate content and apparent nitrogen budget in the soil of summer maize fields<br>施氮时期对玉米土壤硝态氮含量变化及氮盈亏的影响
%A WANG Qi-Xian
%A <br>王启现
%J 生态学报
%D 2004
%I 
%X Applying N at high rate year by year in high maize yield production in China resulted in increasing basal soil N content and decreasing N fertilizer utilization efficiency. Moreover, it caused severe underground water pollution in many areas. Therefore, agricultural researchers are facing how to optimally use N fertilizer. There were a lot of researches on the relationship of N fertilizer application with crop growth and yield components. Due to high precipitation and temperature, soil N mineralization and ...
%K maize(Zea mays L
%K )
%K nitrogen fertilizer
%K N application time
%K soil nitrate content
%K apparent budget of soil N<br>玉米
%K 氮肥
%K 施氮时期
%K 土壤硝态氮
%K 土壤氮素表观盈亏
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=7B3695D4C7115536&yid=D0E58B75BFD8E51C&vid=B91E8C6D6FE990DB&iid=5D311CA918CA9A03&sid=145178081E5EA3CE&eid=7999B0CFB1D30C72&journal_id=1000-0933&journal_name=生态学报&referenced_num=18&reference_num=23