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. 2014 Apr 22;65(1):533–542. doi: 10.1007/s13213-014-0889-9

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© The Author(s) 2014

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Fig. 1 — Effect of different treatments on soil microbial biomass C, dehydrogenase activity and dehydrogenase activity per microbial biomass C under long-term application of mineral fertilizer and organic manure. C no fertilizer, NP mineral NP fertilizer, NPK mineral NPK fertilizer, N mineral N fertilizer, M pig manure, MNP pig manure plus mineral NP fertilizer, MNPK pig manure plus mineral NPK fertilizer, MN pig manure plus mineral N fertilizer. Vertical bars are standard deviation; not followed by the same letter indicate significant difference (P < 0.05)