Fig. 4

Partial least squares regression (PLSR) models predicting resin and rubber contents for guayule samples grown under different irrigation conditions based on partial wavelengths. a Scatter plot of ASE values versus NIR values in DRY dataset based on partial wavelengths (1100–2400 nm): rubber content. b Scatter plot of ASE values versus NIR values in IRR dataset based on partial wavelengths (1600–2400 nm): rubber content. c Scatter plot of ASE values versus NIR values in DRY dataset based on partial wavelengths (1100–2400 nm): resin content. d Scatter plot of ASE values versus NIR values in IRR dataset based on partial wavelengths (1100–2400 nm): resin content