Table 1: Chemical and physical properties of soil and organic matter.

ParameterClay* soilSilt loam*
soil
Organic matter
SludgeStraw

pH (solid/water)5.455.27.916.03
Total C (%)3.013.233.3022.00
Total N (%)0.320.122.845.45
C/N ratio9.3826.611.94.00
Total P (mg Kg−1)60025048002600
Organic matter (%)5.170.2538.7240.55

*(According to [22]).