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. 2018 Nov 30;9:1763. doi: 10.3389/fpls.2018.01763

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Copyright © 2018 Hu, Tan, Yu, Zhao, Coulter, Fan, Yin, Fan and Chai.

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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Aboveground N content of intercropped pea and sole pea in (A) 2012, (B) 2013, and (C) 2014. N0 is the non-N fertilized control. N45, N90, and N135 represent N fertilizer applied at 90 kg N ha⁻¹ as base fertilizer at sowing plus 45, 90, and 135 kg N ha⁻¹ top-dressed at flowering, respectively. Error bars are standard errors of the means.