Fig. 1. Color (I.C.420) at pH 4 and 9, and color (at pH 7) at 1% impurity, versus color at pH 7, across 12 genotypes in Exp. 2. This experiment evaluated genotypes across three contrasting N rates, and the average of genotypes across all N levels is shown. Vertical and horizontal bars indicate least significant differences (P < 0.05).