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)