Fig. 3. Correlation of N, lignin, and total soluble polyphenol concentrations with first derivatives of relative reflectance at different wavelengths. Lignin and total soluble polyphenol were loge–transformed before processing.
Fig. 3. Correlation of N, lignin, and total soluble polyphenol concentrations with first derivatives of relative reflectance at different wavelengths. Lignin and total soluble polyphenol were loge–transformed before processing.