Validation of a Critical Nitrogen Curve for Summer Maize in the North China Plain

查看全文 作　　者：YUE Shan-[1,2]Chao;SUN Fu-[3]Lai;MENG Qing-[1]Feng;ZHAO Rong-[1,4]Fang;LI [1,5]Fei;CHEN Xin-[1]Ping;ZHANG Fu-[1]Suo;CUI Zhen-[1,2]Ling

机构地区：[1]College of Resources and Environmental Sciences,China Agricultural University;[2]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University;[3]Agriculture Bureau of Binzhou;[4]College of Environmental Science and Engineering,Zhongkai University of Agriculture and Engineering;[5]College of Ecology and Environmental Science,Inner Mongolia Agricultural University

出　　处：《Pedosphere》索引2014年第24卷第1期,共8页

基　　金：Supported by the National Basic Research Program(973 Program)of China(No.2009CB118606);the Special Fund for Agro-Scientific Research in the Public Interest of China(No.201103003);the National Natural Science Foundation of China(No.30821003) 摘　　要：The concept of critical N concentration(N_c)has been widely used in agronomy as the basis for diagnosis of crop N status,and allows discrimination between field situations of sub-optimal and supra-optimal N supply.A critical N dilution curve of N_c=34.0W^(-0.37),where W is the aboveground biomass(Mg DM ha^(-1))and N_c the critical N concentration in aboveground dry matter(g kg^(-1)DM),was developed for spring maize in Europe.Our objectives were to validate whether this European critical N dilution curve was appropriate for summer maize production in the North China Plain(NCP)and to develop a critical N dilution curve especially for summer maize production in this region.In total 231 data points from 16 experiments were used to test the European critical N dilution curve.These observations showed that the European critical N dilution curve was unsuitable for summer maize in the NCP,especially at the early growth stage.From the data obtained,a critical N dilution curve for summer maize in the NCP was described by the equation of N_c=27.2W^(-0,27),when aboveground biomass was between 0.64 and 11.17 Mg DM ha^(-1).Based on this curve,more than 90%of the data for the N deficiency supply treatments had an N nutrition index(NNI)<1 and 92%of the data for the N excess supply treatments had an NNI>1. 关键词：氮素营养诊断夏玉米生产中国北方临界曲线验证平原地上生物量

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Validation of a Critical Nitrogen Curve for Summer Maize in the North China Plain

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