Fig. 2. Coefficients of determination (r²) vs. wavelengths for the relationships of forage neutral detergent fiber (NDF), acid detergent fiber (ADF), crude protein (CP) concentrations (%), aboveground biomass (Mg ha^–1), and CP availability (CPA, kg ha^–1) with (a) canopy reflectance, (b) reflectance ratios, and (c) the first derivatives of reflectance at different wavelengths. The r² values were based on a linear model of the calibration data set. Typical wavebands where the reflectances, reflectance ratios or the first derivatives of reflectance have the greatest r² (in parenthesis) with the forage quality parameters are highlighted in the figure (n = 72).