Peng ZHOU, Wei-chao WANG, Wei YANG, Rong-hua JI, Min-zan LI. Effect of Soil Particle Size on Prediction of Soil Total Nitrogen Using Discrete Wavelength NIR Spectral Data[J]. Spectroscopy and Spectral Analysis, 2021, 41(12): 3682
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 12, 3682 (2021)
Fig. 1. Spectral curves of soil with different particle sizes but same soil total nitrogen concentration
Fig. 2. Standard deviation spectra
Fig. 3. Prediction of soil particle size classification based on SVM
Fig. 4. Absorbance at six wavebands
(a): Original absorbance; (b): Corrected absorbance
(a): Original absorbance; (b): Corrected absorbance
Fig. 5. Prediction results of soil total nitrogen concentration based on different soil absorbances
(a): Original absorbance; (b): Corrected absorbance;(c): 0.2 mm soil absorbance
(a): Original absorbance; (b): Corrected absorbance;(c): 0.2 mm soil absorbance
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Table 1. Statistics of soil samples
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Table 2. Accuracy statistics of the BPNN models based on different soil absorbances
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