Agronomy Journal -- Johnson et al. 94 (5): 1071 Figure IG6

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Fig. 6. Rhizoma peanut stem lignin response to percentage of incident photosynthetic photon flux density (PPFD) for harvests (H) in 1989 [Harvest 1 ( ${blacksquare}$ ): y = 91 + 0.40x - 0.0052x², R² = 0.89, root mean square error (RMSE) = 2.9; Harvest 2 ( ${blacktriangleup}$ ): y = 120 - 0.35x, r² = 0.73, RMSE = 5.8; Harvest 3 (•): y = 120 - 0.24x, r² = 0.56, RMSE = 5.7] and 1990 [Harvest 1: not significant, mean = 94 g kg^-1; Harvest 2 ( ${blacktriangleup}$ ): y = 124 - 0.319x, r² = 0.36, RMSE = 13.7; Harvest 3 (•): 142 - 0.161x, r² = 0.36, RMSE = 5.9].