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Table 3 Proportion of soil organic C and total N as biomass C (Cmic:Corg) and biomass N (Nmic:Ntot) and the metabolic quotient (qCO2) as affected by the treatments

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


Cmic:Corg (%)

Nmic:Ntot (%)

qCO2 (μg CO2 mg Cmic g−1 soil h−1)


0.80 b

1.16 ab

1.35 b


1.16 a

1.11 ab

1.17 b


1.04 ab

1.47 a

1.25 b


1.03 ab

1.33 ab

1.36 ab


0.99 ab

0.97 b

1.70 a

  1. Means followed by the same letter(s) within the same column are statistically the same at p ≤ 0.05 (LSD-test)
  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