Agronomy Journal -- Johnson et al. 94 (5): 1071 Figure IG4

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Fig. 4. Rhizoma peanut stem in vitro organic matter digestibility (IVOMD) response to percentage of incident photosynthetic photon flux density (PPFD) for harvests (H) in 1989 [Harvest 1 ( ${blacksquare}$ ): y = 603 + 1.48x, r² = 0.86, root mean square error (RMSE) = 16.1; Harvest 2 ( ${blacktriangleup}$ ): y = 643 + 1.18x, r² = 0.78, RMSE = 17.3; Harvest 3 (•): y = 672 + 0.98x, r² = 0.65, RMSE = 19.3] and in 1990 [Harvest 1 ( ${blacksquare}$ ): y = 618 + 0.71x, r² = 0.71, RMSE = 12.3; Harvest 2 ( ${blacktriangleup}$ ): y = 538 + 0.89x, r² = 0.73, RMSE = 14.8; Harvest 3 (•): 519 + 0.913x, r² = 0.77, RMSE = 13.7].