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Effect of homogeneous and heterogeneous Pi supply on (A) first-order LR density and (B) primordium number, and (C) second-order LR number and (D) primordium number of maize plants at 2, 4 and 6 DAT. For explanation of the treatments see the legend of Fig. 2. Bars indicate means ± s.e. (n = 6 individual plants). Different letters indicate significant differences among treatments on each given day (P < 0.05).
