作物学报Issue(2)：292-299,8.DOI:10.3724/SP.J.1006.2013.00292
华北地区夏玉米临界氮稀释曲线和氮营养指数研究
Critical Nitrogen Dilution Curve and Nitrogen Nutrition Index for Summer Maize in North China Plain
摘要
Abstract
In order to verify the applicability of critical nitrogen (N) dilution curve for summer maize in North China Plain, and the feasibility of N nutrition index (NNI) in evaluating N nutrition status of maize plant, a 2-year experiment with five N-fertilizer treatments (0, 60, 120, 180, and 240 kg N ha–1) was conducted using the cultivar Zhengdan 958. The results showed that the above ground biomass (W) increased significantly with increasing N-fertilizer application within a certain range. The data of above ground biomass and corresponding N concentration for each sampling stage were divided into N limited group and N non-limited group based on the statistical results, then the critical N concentration (Nc) was calculated and the critical N dilution curve model (Nc=34.914W–0.4134) for summer maize was established, and the model parameters had a good similarity to these reported. NNI calculated based on the critical N dilution curve model had a significant correlation with relative N uptake amount, or relative above ground biomass or relative yield. Therefore, critical N dilution curve and NNI can be used to predict plant Nc and characterize plant N status in summer maize in North China Plain.关键词
夏玉米/植株氮浓度/临界氮稀释曲线/氮营养指数/氮营养诊断Key words
Summer maize/Plant N concentration/Critical N dilution curve/N nutrition index/N nutrition diagnosis引用本文复制引用
梁效贵,张经廷,周丽丽,李旭辉,周顺利..华北地区夏玉米临界氮稀释曲线和氮营养指数研究[J].作物学报,2013,(2):292-299,8.基金项目
本研究由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）
