Characterization of Biochar Properties Affected by Different Pyrolysis Temperatures Using Visible-Near-Infrared Spectroscopy

Table 6

Influence of the number of principal components (PCs) on the discrimination accuracy of pyrolysis temperatures of single type of cotton stalk and combined types of biochar using principal components—linear discriminant analysis (PC-LDA) models in calibration and prediction.

Number of PCs used in PC-LDA model	Single type of cotton stalk		Combined types
	Calibration	Prediction	Calibration	Prediction
6	100%	100%	100%	45.2%
5	100%	100%	100%	52.4%
4	100%	85.7%	98.4%	69.0%
3	100%	85.7%	92.1%	69.0%
2	95.2%	78.6%	90.5%	66.7%