Fig. 4. Coefficients of determination (r2) for the linear relationships between canopy reflectance at each wavelength and total fresh weight biomass for (a) wheatgrass and (b) alfalfa, total cumulative evapotranspiration for (c) wheatgrass and (d) alfalfa, and the integrated electrical conductivity of the irrigation water for (e) wheatgrass and (f) alfalfa.