What is a major benefit of high cation exchange capacity?

High cation exchange capacity (CEC) is a key property of soil that significantly enhances its ability to retain essential nutrients. Soils with high CEC have more cation exchange sites available, which allows them to hold onto positively charged ions, such as calcium, magnesium, potassium, and ammonium. This increased nutrient retention means that plants can access these vital nutrients more readily over time, leading to better growth and overall health.

This characteristic is particularly important in agriculture and gardening, as it directly influences the effectiveness of fertilization and the soil's ability to support plant life. When a soil can retain more nutrients, it can sustain crops and gardens even in varying conditions, leading to improved productivity and reduced need for frequent fertilization. Furthermore, high CEC can also help buffer the soil against pH changes, promoting a more stable nutrient environment for plants.

In contrast, lower cation exchange capacity wouldn't provide the same advantages in nutrient retention, and characteristics like lower water holding capacity are generally not associated with high CEC. While improved resistance to drought and reduced soil erosion risks may contribute to overall soil health, they are not direct benefits of high cation exchange capacity.