sodicitet
Sodicitet is the soil condition in which a substantial portion of the soil’s exchangeable cations are sodium ions (Na+). It is typically expressed in terms of an Exchangeable Sodium Percentage (ESP), which is the share of the soil’s cation exchange capacity occupied by sodium, or by related indicators such as the Sodium Adsorption Ratio (SAR) of soil water. Soils with high ESP are considered sodic, while low ESP indicates non-sodic conditions. Sodicity can occur with or without high soluble salts; saline-sodic soils have both high ESP and high soluble salt content.
ESP is calculated as the percentage of CEC occupied by Na+. An ESP above about 15% is
Sodicity develops when soils accumulate sodium relative to calcium and magnesium, often in regions with low
The main impacts of sodicity are physical and chemical. Physically, high exchangeable sodium causes dispersion of
Management focuses on leaching and replacing exchangeable sodium with calcium. Practices include improving drainage, applying gypsum