作物学报Issue(3)：506-514,9.DOI:10.3724/SP.J.1006.2013.00506
夏玉米各器官氮素积累与分配动态及其对氮肥的响应
Dynamic Responses of Nitrogen Accumulation and Remobilization in Summer Maize Organs to Nitrogen Fertilizer
摘要
Abstract
A successive two years’ field experiment with five N application rates was conducted using hybrid Zhengdan 958. The results showed that the process of N accumulation in all organs except grain conformed to a unimodal curve in the whole life cy-cle. The N accumulation in blade, bract, and cob reached the peak at around 12 days after silking, and that in stem and sheath at silking stage and then decreased gradually. The N accumulation in grain and the whole plant continuously increased, and the maximum value appeared at maturity. Compared with other organs, blade was more sensitive to N supply and N deficit stress made the N accumulation peak in advance, accelerated blade N remobilization and promoted senescence of blade. N supply sig-nificantly improved N accumulation amount and N accumulation rate in all organs at various stages, but did not change the trend of N accumulation. On the whole, the demands of maize organs for N could be met at the N application rate of 180 kg N ha–1, and a higher grain yield also achieved. According to the maximum value of accumulated N in organs, the contribution of remobilized N from maize organs to grain showed a trend of blade>stem and sheath>cob>bract, and the mean total contribution rate was 53.3%, of which cob and bract accounted for 12.3%, showing an essential part for grain N, too.关键词
夏玉米/器官/氮肥水平/氮素的积累/分配与再分配Key words
Summer maize/Organ/Nitrogen fertilizer level/Nitrogen accumulation, distribution, and remobilization引用本文复制引用
张经廷,刘云鹏,李旭辉,梁效贵,周丽丽,周顺利..夏玉米各器官氮素积累与分配动态及其对氮肥的响应[J].作物学报,2013,(3):506-514,9.基金项目
本研究由教育部新世纪优秀人才支持计划(NETC-10-0790),国家自然科学基金项目(31071367)和国家公益性行业(农业)科研专项(200903007,201203031)资助 （NETC-10-0790）
