Suppose you have a soil that is made up of 10% organic matter with CEC = 200 cmol/kg, 40% kaolinite with CEC = 10 cmol/kg, and 50% vermiculite with CEC = 100 cmol/kg. 1- Calculate the overall CEC of the soil by taking a weighted average of the three soil components. 2- What percentage of the overall CEC is contributed by the organic matter? How does that number compare to the 10% of the soil itself that is organic?

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Suppose you have a soil that is made up of 10% organic matter with CEC = 200 cmol/kg, 40% kaolinite
with CEC = 10 cmol/kg, and 50% vermiculite with CEC = 100 cmol/kg.
1- Calculate the overall CEC of the soil by taking a weighted average of the three soil components.

2- What percentage of the overall CEC is contributed by the organic matter? How does that number
compare to the 10% of the soil itself that is organic?

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