摘要
试验结果表明 ,两种灌溉方法下各处理之间的产量不存在显著差异 ,与两水处理相比 ,四水处理公顷穗数提高 ,但拔节水导致千粒重极显著降低。四水条件下小麦的氮素吸收量高于两水条件下的相应氮肥处理 ,而氮素生理效率降低。灌四水使氮素在小麦营养器官中的分配比例提高 ,两水灌溉更有利于氮素向子粒转运。各营养器官对子粒氮的贡献率依次为叶片 >茎秆=颖壳 >叶鞘 >根系 ,其中叶片的氮素转移量最高 ,两水灌溉制度下 ,常规施肥量适宜于部分基施、部分于拔节期追施 。
The results of experiments showed the yield of all treatments had no significant differences.The ear per ha increased under 4 time irrigation,but grain weight per 1 000 decreased seriously.The wheat irrigated 2 time absorbed more N than that under 4 time irrigation which had the same N application,yet NPE decreased.With more water supply,the N distributed in vegetative organs was more than that in grain.After anthesis the N proportions transferred from various vegetable organs to the grains were ordered as leaf>stem=ear axis and grain husk>leaf sheath>root,among them leaf got the head of the others.Under 2 time irrigation,some N rates should be used as base N,and the others were used as dressing N.However economical nitrogen rates might all be used as base N as well.
出处
《华北农学报》
CSCD
北大核心
2002年第1期69-75,共7页
Acta Agriculturae Boreali-Sinica
基金
国家自然科学基金资助项目 (395 70 4 37)
