Skip to main content

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


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)


227 b

19.33 b

7.40 c

7.66 bc


313 ab

19.93 b

8.81 bc

7.26 c


309 ab

28.52 a

9.02 bc

8.98 ab


325 ab

29.21 a

10.57 ab

9.24 a


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