What does cation exchange capacity (CEC) refer to?

Cation exchange capacity (CEC) is the measure of how well soil can retain and supply cations, which are positively charged ions. This capacity is crucial for nutrient availability in the soil, as it determines how well essential nutrients like calcium, magnesium, potassium, and various trace metals can be held and made accessible to plants. Soils with a high CEC can hold more nutrients and offer better fertility potential compared to soils with a low CEC. The ability to exchange cations is vital for maintaining soil health and enhancing plant growth, as it influences both the retention of important nutrients and the soil’s overall chemical behavior.

Understanding CEC is fundamental for soil evaluation and management practices, especially in agriculture and horticulture, where nutrient availability directly impacts crop yield and overall soil productivity.