Question

13. A soil contains 30% smectite, 10% kaolinite, and 2% organic matter. Calculate an estimated CEC for this hypothetical soil.

Answer 1

estimated CEC for given hypothetical soil is 26.25 meq/100g.

Step-by-step explanation:

Average CEC in smectite = 62.5 meq/100g. Since it ranges from(25-100 meq/100g)

Average CEC in kaolinite = 10 meq/100g.

Average CEC in organic matter = 325meq/100g.

Range(250-400 meq/100g).

Estimated CEC for given soil will be,

`=30\% *\ avg.\ CEC\ in\ smectite + 10\% * \ avg.\ CEC\ in  \ kaolinite +2\% * avg\ CEC\ in\ organic\ matter.`

`= 0.3* 62.5 + 00.1 * 10 + 0.02* 325`

= 26.25 meq/100g.