Fig. 1

Potential nitrification activity (a) and potential nitrification rate (b) in rhizosphere soil under different fertilizer treatments. MF: inorganic fertilizer; RF: rice straw and inorganic fertilizer; OM: 30% organic manure and 70% inorganic fertilizer; CK: without fertilizer input as a control. Vertical bars represent the standard error. Different lowercase letters were indicated significantly at difference among fertilizer treatments in 0.05 levels. The same as below.