How are the cation exchange capacity (CEC) and percent base saturation calculated for the soil test report?

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How are the cation exchange capacity (CEC) and percent base saturation calculated for the soil test report?

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To determine the cation exchange capacity (CEC), calculate the milliequivalents of H, K, Mg, and Ca per 100g of soil (meq/100g soil) by using the following formulas:

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