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《Scientia Agricultura Sinica》 2003-07
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Diagnosis of Nitrogen Status in Rice Leaves with the Canopy Spectral Reflectance

XUE Li-hong, CAO Wei-xing, LUO Wei-hong, JIANG Dong, Meng Ya-li, ZHU Yan (Key Laboratory of Crop Growth Regulation, Ministry of Agriculture/ Nanjing Agricultural University, Nanjing 210095)  
The investigation was made on the relationship of seasonal time course canopy spectral reflectance, and ratio index to total leaf nitrogen accumulation(leaf nitrogen content per unit ground area)in rice under different nitrogen treatments. The results showed that a close correlation between the canopy spectral reflectance and total leaf nitrogen accumulation existed. Ratio of near-infrared to green band (R 810/R 560) was linearly related with total leaf nitrogen accumulation, independent of nitrogen levels and development stages. Different datasets were used to test the regression equation, with average estimation accuracy of 91.22%, RMSE of 1.09 and average relative error of 0.026.
【Fund】: 国家重点基础研究发展规划资助项目 (G2 0 0 0 0 7790 0 );; 国家自然科学基金资助项目 (30 0 30 0 90 )
【CateGory Index】: S511
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