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. 2019 Jun 12;10:784. doi: 10.3389/fpls.2019.00784

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Copyright © 2019 Wang and Ning.

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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Sugar (A,B) and starch (C,D) concentration in the ears of phosphorus deficient (P0) and phosphorus sufficient (P150) maize plants at silking and 21 DAS in 2015 (A,C) and 2016 (B,D). Bars represent the standard error of the mean (n = 4). Statistical differences between P levels in each year are marked with asterisks (^∗P < 0.05, ^∗∗P < 0.01).