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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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Grain protein content of winter wheat grown at different N application rates for all experimental years at Wenxian (A), Zhengzhou (B), and Kaifeng (C) and their correlation with N application rate (D).