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. 2019 Feb 22;10:181. doi: 10.3389/fpls.2019.00181

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Copyright © 2019 Ma, Liu, Li, Zhang, Wang, Lu, Wang, Xie, Ma and Kang.

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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Nitrate distribution in the 0–100 cm soil layers after the winter wheat harvest for plants grown under different N application rates during the harvest years 2011–2016 in Wenxian. Panels (A), (B), (C), (D), (E), and (F) show the nitrate distribution for the different N rates in 2011, 2012, 2013, 2014, 2015, and 2016, respectively. Horizontal bars represent the standard errors of the mean.