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- [8] Predicting Grain Yield and Protein Content in Winter Wheat at Different N Supply Levels Using Canopy Reflectance Spectra[J]. XUE Li-Hong~(1,2) CAO Wei-Xing~(1*2) YANG Lin-Zhang~2 1 Key Laboratory of Crop Growth Regulation,Ministry of Agriculture,Nanjing Agricultural University,Nanjing 210095 (China). 2 Institute of Soil Sciences,Chinese Academy of Sciences,Nanjing 210008 (China).Pedosphere. 2007(05)