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. 2014 Oct 10;9(10):e108555. doi: 10.1371/journal.pone.0108555

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© 2014 Zhen 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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CK: no fertilizer; N: N fertilizer; B: bacteria fertilizer; NB: N fertilizer + bacteria fertilizer; M: manure compost; MB: manure compost + bacteria fertilizer. Data are means ± SD (n = 3). Different lower case letters indicate significant differences (ANOVA, LSD test, p<0.05) among fertilizer treatments; different upper case letters indicate significant differences among maize growth stages.