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. 2018 May 1;9:576. doi: 10.3389/fpls.2018.00576

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Copyright © 2018 Liu, Gao, Gao, Liu, Zhao and Zhang.

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 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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Effect of nitrogen rate on leaf area index (LAI) of summer maize during growth stages in 2015 and 2016. V6: six-leaf stage, V12: twelve-leaf stage, R1: silking stage, R3: milk stage, R6: physiological maturity stage. Nitrogen applied to maize are 0 kg N ha^-1 (N0), 129 N ha^-1 (N1), 185 kg N ha^-1 (N2), and 300 kg N ha^-1 (N3). Error bars are given as SD. NS, not significant, P > 0.05. ^∗, ^∗∗Significant at the 0.05 and 0.01 probability level, respectively.