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If the contents of exchangeable ions (cmol kg-1) determined in soil are Na+ = 5, K+ = 5, Ca2+ = 10, Mg2+ = 2, H+ = 1, Al+3 = 1, Cl- = 1.6 and HCO-3 =0.4, the CEC of soil is

If the contents of exchangeable ions (cmol kg-1) determined in soil are Na+ = 5, K+ = 5, Ca2+ = 10, Mg2+ = 2, H+ = 1, Al+3 = 1, Cl- = 1.6 and HCO-3 =0.4, the CEC of soil is Correct Answer 24 cmol (P<sup>+</sup>) kg<sup>-1</sup>

CEC is cation exchange capacity is a measure of the soil’s ability to hold positively charged ions.
If the contents of exchangeable ions (cmol kg-1) determined in soil are
Na+ = 5
K+ = 5
Ca2+ = 10
Mg2+ = 2
H+ = 1
Al+3 = 1
Cl- = 1.6
HCO-3 = 0.4
Summing up all the values of positive ions, we get the value of CEC of soil i.e. 24 cmol (P+) kg-1

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