%0 Journal Article
%T Effects of N fertilization on winter wheat grain yield and its crude protein content and apparent N losses<br>氮肥施用对冬小麦产量、品质和氮素表观损失的影响研究
%A CUI Zhenling
%A SHI Liwei
%A XU Jiufei
%A LI Junliang
%A ZHANG Fusuo
%A CHEN Xinping
%A <br>崔振岭
%A 石立委
%A 徐久飞
%A 李俊良
%A 张福锁
%A 陈新平
%J 应用生态学报
%D 2005
%I 
%X Field experiments were conducted at four sites in 2002 to study the effects of N fertilization on winter wheat yield and its crude protein content and apparent N losses. The results showed that at these sites, the N application rate for maximum grain yield was 0, 0, 79 and 118 kg x hm(-2), and that for maximum grain crude protein content was 122, 100, 127 and 174 kg x hm(-2), respectively. The residual nitrate-N content in 0 approximately 90 cm soil layer after harvest was linearly increased, while the apparent N losses during wheat growth season was exponentially increased with increasing N application rate. Under the N application rate for maximum yield, soil residual nitrate-N content ranged from 86 to 115 kg x hm(-2) and apparent N losses ranged from 2 to 32 kg x hm(-2), which were much lower than the residual nitrate-N content (106 approximately 168 kg x hm(-2))and apparent N losses(14 approximately 56 kg x hm(-2)) when the maximum grain crude protein content was achieved. The results showed that the maximum wheat grain yield and the environment effects of N fertilization could be harmonized by an optimized N application rate, but, if considering the importance of wheat grain protein, more research in the future should be needed.
%K Optimized N management
%K Soil nitrate-N content
%K Apparent N losses
%K Crude protein content<br>优化氮肥管理
%K 土壤硝态氮残留
%K N表观损失
%K 粗蛋白含量
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=DB88B44138B6B1A1&yid=2DD7160C83D0ACED&vid=7801E6FC5AE9020C&iid=708DD6B15D2464E8&sid=6E3B915514BCF8E8&eid=0EBD8BDCA4871699&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=21&reference_num=23