This tool determines the relative proportion of sodium ions occupying the cation exchange sites in soil. It expresses the amount of sodium adsorbed to the soil particles as a percentage of the total cation exchange capacity. For instance, a value of 15% indicates that 15% of the soil’s capacity to hold positively charged ions is occupied by sodium.
Assessment of this value is crucial in evaluating soil quality and its suitability for agricultural purposes. Elevated levels can lead to soil dispersion, reduced permeability, and impaired plant growth. Understanding these levels assists in developing effective soil management strategies, such as amendment application or irrigation practices, to mitigate sodicity issues and improve soil health. Historical usage includes land evaluation for irrigation suitability, recognizing that sodium buildup can render productive land infertile.
