摘要
大田试验研究了限水灌溉 (于拔节、开花期各灌 750 m3 .hm-2 )条件下冬小麦对氮素的吸收利用。结果表明 :在 N0～ 375kg.hm-2范围内 ,随氮肥用量加大 ,小麦产量提高 ,每平方百米施 2 2 5kg纯氮的处理达到最高产量 (6 4 6 6 .5kg.hm-2 ) ,在此基础上增施氮肥产量不再增加 ;氮素生理效率随氮肥量的递增而降低 ;限水灌溉下冬小麦对氮素的吸收集中在开花期以前 ,并且增加氮肥量降低了开花—成熟期的氮素吸收量 ;随着施氮量的增加 ,分配于营养器官的氮素比例增加 ,其中以叶片占的比例最大 。
Field experiment has been conducted to illuminate nitrogen absorbtion and utilization in winter wheat under water saving.The results show that with the increase of N application the yield increared also and the highest yield 6466.5kg·hm -2 were oblained with 225kg·hm -2 N application; NPE decreased with the N increasing,and more N absorbed by winter wheat was distributed in nutrition organs aboveground plant,in which leaf had the highest ratio. At the same time the harvest index declined in turn.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2000年第5期17-22,共6页
Journal of China Agricultural University
基金
国家自然科学基金资助项目! (39570 4 37)
关键词
冬小麦
限水灌溉
氮素
吸收利用
氮肥
winter wheat
water saving
nitrogen
absorbtion and utilization
