A soil with high cation exchange capacity can hold more

A soil with a high cation exchange capacity can hold more Potassium.
Cation exchange capacity is a measure of soil’s ability to hold positively charged ions, thus the soil with high cation exchange capacity can hold more positively charged ions and potassium is a positively charged ion. And that is why soil with high cation exchange capacity is considered more fertile as it can hold good ions which add nutrients to the soil.