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Fig. 2. Microbial biomass C (MBC) at three sampling times at (A) 0- to 5-cm depth and (B) 5- to 15-cm depth; NT = no-till, ST = standard tillage, +Res = residue added, –Res = no residue added, Row = cores taken from plant row, Ctr = cores taken from the bed center, Int = cores taken from an intermediate position between the plant row and the bed center. Statistical differences were expressed with s and t at 10 d, and x and y at 31 d; NS means no statistical difference among treatments at a sampling time. The error bars show the standard error.
