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. 2016 Aug 2;7:1118. doi: 10.3389/fpls.2016.01118

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Copyright © 2016 Yang, Meng, Chen, Zhang, Wang, Zhao and Zhou.

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) or licensor 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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Soil -N (A) and -N (B) levels under conventional management practices and two integrated management strategies at two fertility levels at soil depths of 0–20 cm and 20–40 cm in 2012 and 2013. CM and IMS stand for conventional management practices and integrated management strategies (see Materials and Methods). IF, BF, and BO stand for the initial flowering stage, full-bloom stage, and boll-opening stage, respectively. Different letters indicate significant difference at the level of P < 0.05.

Inline graphic — Soil -N (A) and -N (B) levels under conventional management practices and two integrated management strategies at two fertility levels at soil depths of 0–20 cm and 20–40 cm in 2012 and 2013. CM and IMS stand for conventional management practices and integrated management strategies (see Materials and Methods). IF, BF, and BO stand for the initial flowering stage, full-bloom stage, and boll-opening stage, respectively. Different letters indicate significant difference at the level of P < 0.05.