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Nutritive Value of Rhizoma Peanut Growing under Varying Levels of Artificial Shade

^a New England Small Farm Inst., 275 Jackson St., Belchertown, MA 01007
^b Box 110300, Agron. Dep., Univ. of Florida, Gainesville, FL 32611-0300
^c Agric. Res. Inst. of Minas Gerais (EPAMIG), Belo Horizonte, Brazil

View larger version (22K): [in a new window]   Fig. 1. Rhizoma peanut leaf crude protein (CP) response to percentage of incident photosynthetic photon flux density (PPFD) for harvests (H) in 1989 [Harvest 1 (): y = 254 - 1.12x + 0.013x2, R2 = 0.85, root mean square error (RMSE) = 7.4; Harvest 2 (): y = 222 + 0.34x, r2 = 0.40, RMSE = 11.3; Harvest 3 (•): y = 188 + 1.43x - 0.0067x2, R2 = 0.93, RMSE = 4.5] and 1990 [Harvest 1: not significant, mean = 207 g kg-1; Harvest 2 (): y = 175 + 0.51x, r2 = 0.52, RMSE = 13.2; Harvest 3 (•): 177 + 0.60x, r2 = 0.90, RMSE = 5.2].

View larger version (21K): [in a new window]   Fig. 2. Rhizoma peanut leaf in vitro organic matter digestibility (IVOMD) [Harvest (H) 1 (): y = 704 + 0.421x, r2 = 0.50, root mean square error (RMSE) = 11.4; Harvest 2: not significant, mean = 678 g kg-1; Harvest 3 (•): y = 667 + 0.28x, r2 = 0.33, RMSE = 10.8] and neutral detergent fiber (NDF) response to percentage of incident photosynthetic photon flux density (PPFD) for harvests in 1990 [Harvest 1 (): y = 343 + 0.98x - 0.013x2, R2 = 0.84, RMSE = 9.6; Harvest 2 (): 319 + 2.58x - 0.021x2, R2 = 0.66, RMSE = 9.4; Harvest 3: not significant, mean = 387 g kg-1].

View larger version (20K): [in a new window]   Fig. 3. Rhizoma peanut stem crude protein (CP) response to percentage of incident photosynthetic photon flux density (PPFD) for harvests (H) in 1989 [Harvest 1 (): y = 155 - 1.15x + 0.0105x2, R2 = 0.68, root mean square error (RMSE) = 6.5; Harvest 2 (): y = 127 + 0.158x, r2 = 0.37, RMSE = 5.6; Harvest 3: not significant, mean = 138 g kg-1] and 1990 [Harvest 1: not significant, mean = 106 g kg-1; Harvest 2 (): y = 96.1 + 0.259x, r2 = 0.55, RMSE = 6.3; Harvest 3 (•): 101 + 0.128x, r2 = 0.50, RMSE = 3.5].

View larger version (25K): [in a new window]   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 (): y = 603 + 1.48x, r2 = 0.86, root mean square error (RMSE) = 16.1; Harvest 2 (): 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 (): y = 618 + 0.71x, r2 = 0.71, RMSE = 12.3; Harvest 2 (): y = 538 + 0.89x, r2 = 0.73, RMSE = 14.8; Harvest 3 (•): 519 + 0.913x, r2 = 0.77, RMSE = 13.7].

View larger version (22K): [in a new window]   Fig. 5. Rhizoma peanut stem neutral detergent fiber (NDF) response to percentage of incident photosynthetic photon flux density (PPFD) for harvests (H) in 1989 [Harvest 1 (): y = 617 - 0.87x, r2 = 0.72, root mean square error (RMSE) = 14.8; Harvest 2 (): y = 546 - 1.17x, r2 = 0.90, RMSE = 10.4; Harvest 3: not significant, mean = 495 g kg-1] and 1990 [Harvest 1 (): y = 516 - 0.90x, r2 = 0.61, RMSE = 19.6; Harvest 2 (): y = 571 - 0.78x, r2 = 0.66, RMSE = 15.2; Harvest 3 (•): 574 - 0.79x, r2 = 0.70, RMSE = 14.0].

View larger version (23K): [in a new window]   Fig. 6. Rhizoma peanut stem lignin response to percentage of incident photosynthetic photon flux density (PPFD) for harvests (H) in 1989 [Harvest 1 (): y = 91 + 0.40x - 0.0052x2, R2 = 0.89, root mean square error (RMSE) = 2.9; Harvest 2 (): 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 (): y = 124 - 0.319x, r2 = 0.36, RMSE = 13.7; Harvest 3 (•): 142 - 0.161x, r2 = 0.36, RMSE = 5.9].