Analysis of common canopy vegetation indices for indicating leaf nitrogen accumulations in wheat and rice |
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Authors: | Yan Zhu Xia YaoYongChao Tian XiaoJun LiuWeiXing Cao |
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Affiliation: | Hi-Tech Key Laboratory of Information Agriculture of Jiangsu Province/Key Laboratory of Crop Growth Regulation of Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China |
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Abstract: | The common spectra wavebands and vegetation indices (VI) were identified for indicating leaf nitrogen accumulation (LNA), and the quantitative relationships of LNA to canopy reflectance spectra were determined in both wheat (Triticum aestivum L.) and rice (Oryza sativa L.). The 810 and 870 nm are two common spectral wavebands indicating LNA in both wheat and rice. Among all ratio vegetation indices (RVI), difference vegetation indices (DVI) and normalized difference vegetation indices (NDVI) of 16 wavebands from the MSR16 radiometer, RVI (870, 660) and RVI (810, 660) were most highly correlated to LNA in both wheat and rice. In addition, the relations between VIs and LNA gave better results than relations between single wavebands and LNA in both wheat and rice. Thus LNA in both wheat and rice could be indicated with common VIs, but separate regression equations are better for LNA monitoring. |
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Keywords: | Canopy reflectance spectra CropScan Leaf nitrogen accumulation Ratio vegetation index Rice Wheat |
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