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Table 1 Soil chemical properties collected in October, 2006

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

Treatments \( \begin{array}{*{20}l} {{\text{pH}}_{{ ( {\text{H}}_{ 2} {\text{O)}}}} } \hfill \\ \end{array} \) P (mg kg−1) K (mmolckg−1) Corg (%) Ntot (%) C/N Cr (mg kg−1) Ni (mg kg−1) Zn (mg kg−1) Cu (mg kg−1)
MF 5.83 ab 11.50 d 4.90 a 2.84 cd 0.17 b 15.57 a 21.30 e 0.60 d 4.60 c 6.77 c
1FS 6.00 a 15.30 d 3.60 ab 2.71 d 0.18 b 15.61 a 24.37 d 1.30 c 1.00 d 5.07 d
2FS 5.80 ab 50.50 c 2.40 bc 2.94 c 0.19 b 14.63 a 27.13 c 2.20 b 5.80 c 7.67 c
4FS 5.80 ab 65.80 b 2.10 c 3.15 b 0.22 ab 14.82 a 32.50 b 2.80 a 14.90 b 9.70 b
8FS 5.67 b 179.50 a 2.50 bc 3.82 a 0.26 a 17.80 a 34.07 a 3.30 a 28.30 a 11.43 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