Expert answer:The effective cation exchange capacity of a soil i

  

Solved by a verified expert:The effective cation exchange capacity of a soil increased from 10 cmolc/kg to 15cmolc/kg when the soil pH was increased from 4.0 to 6.5. The colloids in the soil are primarily smectite and organic matter. Would you attribute the increase in CEC to the smectite, the organic matter, or both? Why?

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