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Table 2 Microbial biomass C and N, basic respiration and FDA activity as affected by the treatments

From: Microbial activities in soil cultivated with corn and amended with sewage sludge

Treatments Cmic (μg g−1 soil) Nmic (μg g−1 soil) BR (μg CO2 g−1 soil dia−1) FDA (μg g−1 soil h−1)
MF 227 b 19.33 b 7.40 c 7.66 bc
1SF 313 ab 19.93 b 8.81 bc 7.26 c
2SF 309 ab 28.52 a 9.02 bc 8.98 ab
4SF 325 ab 29.21 a 10.57 ab 9.24 a
8SF 368 a 25.35 ab 15.05 a 10.3 a
  1. Means followed by the same letter(s) within the same column are statistically the same at p ≤ 0.05 (LSD-test for Cmic, Nmic, FDA, multiple comparison Friedman test for BR)
  2. MF, mineral fertilization recommended for the crop; 1FS, sewage sludge based on the nitrogen concentration that provides the same amount of N as in the mineral fertilization; 2FS, two; 4FS, four; 8FS, eight times the N recommended sewage sludge dosage. Cmic, microbial biomass C; Nmic, microbial biomass N; BR, basic respiration; FDA, fluorescein diacetate activity