Fig. 3. Cotton leaf (A) hyperspectral reflectance of the four N treatments in the N study, (B) reflectance differences of treatments from the control (168 kg N ha^–1), and (C) reflectance sensitivity to N fertilizer rate. Data are means of five (2001) or eight (2002) measuring dates. Each time, measurements were made on 15 individual leaves from three replications of each treatment.