Table 2: Concentrations of organic matter (OM) and mineral elements, pH values, and C/N ratios determined in filter cake calculated on dry weight basis. Data are taken from reports of different authors for contrasting pedoclimatic conditions.

DeterminationsFilter cake
(*) [10] [12] [36] Average

OM (%)29.61522.3
pH8.27.17.7
N (%)1.44.81.60.32.0
P (%)1.21.81.30.11.1
K (%)0.20.30.40.40.3
Ca (%)2.71.62.51.72.1
Mg (%)1.10.40.20.6
S (%)0.20.30.25
C/N ratio12253624

*: Data of the authors. —: Not determined.