Fig. 3


Important characteristic wavelengths contributed to partial least squares regression (PLSR) models for predicting resin and rubber content in guayule samples grown under dry condition. a The original absorbance spectra plot for all the scanned samples using ASD FieldSpec®3 spectrophotometer; b Second derivative of NIR reflectance spectra from ASD FieldSpec®3 spectrophotometer for resin content; c Second derivative of NIR reflectance spectra from ASD FieldSpec®3 spectrophotometer for rubber content; d Resin and rubber calibration beta coefficients from ASD FieldSpec®3 spectrophotometer as a function of wavelengths