Fig. 1 Mean soybean tap root length as a function of time in subsurface solution Al treatments maintained at pH values of (a) 4.2 and (b) 5.2 in Exp. 1. Symbols are observed values averaged across genotypes Ransom and PI, and lines are predicted values from polynomial regression models. Vertical bar denotes least significant difference (P < 0.05) for the pH by Al by time interaction

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