What is the cation exchange capacity of humus?
(A) 2 - 15 C mol (p+) kg -1
(B) 250 - 1500 C mol (p+) kg -1
(C) 25 - 150 C mol (p+) kg -1
(D) 0 - 2 C mol (p+) kg -1
(E) None of these
The correct answer is B
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