The CEC is very high, indicating that the Humus. In the study, sewage sludge, which is the average of the CEC is 6.71me/100g show that there is less amount of Humus.
The high CEC that weighs Humus very much. In this study sewage sludge this average CEC is that the 6.71me / 100g shows that the quantity of Humus is less.