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| Prediction on total potassium and available potassium content of hilly paddy soil in Southern China based on hyper-spectral characteristics |
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| Abstract: |
| Abstract：This article took the hyper-spectral reflectance of paddy soil in Xingguo County as the research
objectives，analyzed the correlations of soil available potassium and total potassium with the hyper-spectral
reflectance，derived the hyper-spectral indices of the soil total potassium and available potassium，then built the
paddy soil total potassium and available potassium predicting model based on the correlation between potassium
content and spectral indices. The results showed that the composition of soil available potassium and total potassium
caused the difference in their hyper-spectral characteristics. In the band of 355-620 nm，the available potassium
and total potassium had the same effect on the hyper-spectral reflectance；in the band of 621-2 250 nm，the
correlation of soil total potassium with hyper-spectral reflectance was greater than that of the available soil
potassium. By analyzing the correlation coefficient of paddy soil potassium content and 18 kinds of mathematical
transformations of hyper-spectral reflectance to extract sensitive wavelength，the sensitive wavelengths of total
potassium were 602 nm and 804 nm，the sensitive wavelengths of available potassium were 602 nm，1 058 nm，
1 638 nm and 2 214 nm. T he pr edict ing modelsf or paddy soil potassium content were built with hyper-spectral indices as independent variables and available potassium as dependent variable，and the models were quite good in stability and
predictability． |
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