Fig. 3. Spectral response curves for conventional (CT) and no-tillage (NT) treatments at the Piedmont study site. Data represent average reflectance (%) along the y axis and wavelength (485–1650 nm) along the x axis for remotely sensed data acquisitions on 19 Apr., 27 Apr., and 9 May 2005. Significant treatment differences for each wavelength are denoted (*) ( = 0.10).