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Effects of P stress on CN per node. CN per node of maize is shown at 35 d after planting in greenhouse mesocosms (A) and at anthesis in the field (B) under high and low P. The data shown are means ± se of four replications of four genotypes in each phenotypic class of either large CN or small CN. Different letters represent significant differences (P ≤ 0.05) compared within each node. HP = high P, LP = low P, LCN = large CN, SCN = small CN.
