A kg of soil is determined to contain exchangeable cations in these amounts (note the units are cmol of the ion): Ca = 9 cmol Mg = 6 cmol K = 3 cmol Na = 2 cmol What is the CEC of this Soil? 20 cmolc/kg 12.5 cmolc/kg 3.5 cmolc/kg C 35 cmolc/kg

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