中国生态农业学报2011，Vol.19Issue(2)：293-299,7.DOI:10.3724/SP.J.1011.2011.00293
不同灌溉处理对夏玉米氮素吸收及转移的影响
Effect of irrigation on nitrogen uptake and translocation in summer maize
摘要
Abstract
A 2-year field experiment consisting of four irrigation treatments (i.e., 1～4 irrigations during maize growth period) was carried out to study the effects of irrigation amount on the uptake, distribution and translocation of nitrogen in maize plants.The results showed that increased irrigation amount enhanced nitrogen accumulation and distribution in maize stems and leaves at jointing and tasseling stages.However, no significant differences were noted at late grain-filling stage among the different treatments.About 75％ of accumulated nitrogen in maize spikes was from post-anthesis assimilation and 25％ from translocated nitrogen in stems and leaves.This implied that spikes mainly absorbed N from soil during the stages of grain-filling and maturity.While abundant water supply increased N uptake in vegetative organs, it decreased post-anthesis assimilation rate.It was therefore necessary to maintain moderate water conditions to ensure not only optimum nitrogen absorption, but also increase nitrogen store in stems and leaves.The stored nitrogen would be translocated to grains, which could improve nitrogen use efficiency.关键词
夏玉米/灌溉次数/氮素吸收/氮素转移/氮素贡献率Key words
Summer maize/ Irrigation times/ Nitrogen uptake/ Nitrogen translocation/ Nitrogen contribution proportion分类
农业科技引用本文复制引用
苗文芳,陈素英,邵立威,孙宏勇,张喜英..不同灌溉处理对夏玉米氮素吸收及转移的影响[J].中国生态农业学报,2011,19(2):293-299,7.基金项目
中国科学院知识创新工程重大项目(KSCX1-YW-09-05)和河北省科技支撑项目(06220112D)资助 （KSCX1-YW-09-05）
