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Correlations of kernel numbers in the apical (A), middle (B), and basal (C) sections of maize spikes with the Zn concentration in shoots at the tasseling (VT) stage. Correlations of the change in grain yield with the change in kernel numbers of the apical (D), middle (E), and basal (F) sections of maize spikes. *** P < 0.001, ** P < 0.01. ns, not significant.
