A New Critical Nitrogen Dilution Curve for Rice Nitrogen Status Diagnosis in Northeast China

查看全文 作　　者：HUANG [1,2]Shanyu;MIAO [1,3]Yuxin;CAO [4]Qiang;YAO [1]Yinkun;ZHAO [5]Guangming;YU [1]Weifeng;SHEN [1]Jianning;YU [1,2]Kang;Georg [2]BARETH

机构地区：[1]International Center for Agro-Informatics and Sustainable Development, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193 (China);[2]Institute of Geography, University of Cologne, K5ln 50923 (Germany);[3]Precision Agriculture Center, Department of Soil, Water and Climate, University of Minnesota, St. Paul 55108 (USA);[4]National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, Nanjing 210095 (China);[5]Qixing Farm, Jiansanjiang, Jiamusi 156399 (China)

出　　处：《Pedosphere》索引2018年第28卷第5期,共9页

基　　金：supported by the Key National Research and Development Program (No. 2016YFD0200602);the National Basic Research Program (No. 2015CB150405);the National Natural Science Foundation (No. 31421092);the SINOGRAIN Project (No. CHN-2152, 14-0039) of China 摘　　要：In-season diagnosis of crop nitrogen(N) status is crucial for precision N management. Critical N(N_c) dilution curve and N nutrition index(NNI) have been proposed as effective methods to diagnose N status of different crops. The N_c dilution curves have been developed for indica rice in the tropical and temperate zones and japonica rice in the subtropical-temperate zone, but they have not been evaluated for short-season japonica rice in Northeast China. The objectives of this study were to evaluate the previously developed N_c dilution curves for rice in Northeast China and to develop a more suitable N_c dilution curve in this region. A total of17 N rate experiments were conducted in Sanjiang Plain, Heilongjiang Province in Northeast China from 2008 to 2013. The results indicated that none of the two previously developed N_c dilution curves was suitable to diagnose N status of the short-season japonica rice in Northeast China. A new N_c dilution curve was developed and can be described by the equation N_c = 27.7 W^(-0.34) if W ≥ 1 Mg dry matter(DM) ha^(-1) or N_c = 27.7 g kg^(-1) DM if W < 1 Mg DM ha^(-1), where W is the aboveground biomass. This new curve was lower than the previous curves. It was validated using a separate dataset, and it could discriminate non-N-limiting and N-limiting nutritional conditions. Additional studies are needed to further evaluate it for diagnosing N status of different rice cultivars in Northeast China and develop efficient non-destructive methods to estimate NNI for practical applications. 关键词：曲线显示中国东北诊断区域开发氮装饰用生物资源

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A New Critical Nitrogen Dilution Curve for Rice Nitrogen Status Diagnosis in Northeast China

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