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Fig. 3. Microbial biomass C (MBC) derived from cowpea residue at 10 and 31 d; NT = no-till, ST = standard tillage, +Res = 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 are expressed with a or b and h or i at 0- to 5- and 5- to 15-cm depths, respectively, at 10 d, and with s or t and x or y, respectively, at 31 d. The error bars show the standard error.
