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. 2015 Apr 13;10(4):e0122791. doi: 10.1371/journal.pone.0122791

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© 2015 Liu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 6 — B: basal grain; M: middle grain; U: upper grain. PM: plastic film mulching management; TN: traditional non mulching management. Vertical bars represent ± the standard error of the mean (n = 3).