A soil contains 4% humus, 10% montmorillonite, 10% vermiculite, and 10% Fe, Al oxides. What is its approximate cation exchange capacity? A soil has been determined to contain exchangeable cations in...

A soil contains 4% humus, 10% montmorillonite, 10% vermiculite, and 10% Fe, Al oxides. What is its approximate cation exchange capacity?

A soil has been determined to contain exchangeable cations in these amounts: Ca²⁺
= 9 cmolc , Mg²⁺
= 3 cmolc , K⁺
= 1 cmolc , and Al³⁺
= 3 cmolc. (a) What is the CEC of this soil? (b) What is the aluminum saturation of this soil?