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. 2019 Oct 3;10:1203. doi: 10.3389/fpls.2019.01203

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Copyright © 2019 Xue, Yue, Liu, Zhang, Chen and Zou

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The shoot Zn concentration and accumulation of summer maize at V6, V12, R1, R3, and R6 stages as affected by N application rates in 2009 (A, C) and 2010 (B, D), respectively, in the field. The bars represent the standard error of the mean (n = 4 in 2009 and n = 3 in 2010). For each stage, bars with same lowercase letters are not significantly different in different N treatments (P < 0.05). ns indicates no significant difference. *, **, and *** indicate significant difference at P < 0.05, < 0.01, and < 0.001, respectively.