Fig. 3 Number of lateral roots on tap roots at harvest in the subsurface compartment for soybean genotypes N93 (N), Ransom (R), PI, and Young (Y), as a function of Al concentration in solutions with 2 and 10 mM Ca in Exp. 2. Vertical bar denotes the least significant difference (P < 0.05) for the genotype x Al x Ca interaction

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