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. 2018 Oct 2;9:1446. doi: 10.3389/fpls.2018.01446

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Copyright © 2018 Wang, Wang, Xing, Yun and Zhang.

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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Effects of nitrogen rate, plastic mulching and basal nitrogen application depth on grain yield (A, 2014; B, 2015), biomass (C, 2014; D, 2015), and harvest index (E, 2014; F, 2015) of maize. Different letters in each section of a column indicate significant differences at p < 0.05. CK, no fertilizer and no mulching treatment; T0, traditional broadcast nitrogen fertilizer with mulching treatment; T1, basal nitrogen application at a depth of 6 cm with no mulching treatment; T2, basal nitrogen application at a depth of 6 cm with plastic mulching treatment; T3, basal nitrogen application at a depth of 12 cm with no mulching treatment; T4, basal nitrogen application at a depth of 12 cm with plastic mulching treatment.