Figure 3. Spectral response curves for PE 3 are reported for predrought (9 Aug. 2005), early drought (23 Aug. 2005), middrought (6 Sept. 2005), and late drought (15 Sept. 2005). Data represent average reflectance (%) along the y axis and wavelength (485–1650 nm) along the x axis for each treatment (645CC, 375CC, 511CC, 522CC, and AT201).