Soil salinity is the salt content in the soil; the process of increasing the salt content is known as salinization. Wikipedia

Process of increasing the salt content Wikidata

Measurement of the quantity of mineral salts found in a soil. Many semi-arid and arid areas are naturally salty. By definition they are areas of substantial water deficit where evapotranspiration exceeds precipitation. Thus, whereas in humid areas there is sufficient water to percolate through the soil and to leach soluble materials from the soil and the rocks into the rivers and hence into the sea, in deserts this is not the case. Salts therefore tend to accumulate. OmegaWiki

The accumulation of soluble mineral salts near the surface of soil, usually caused by the capillary flow of water from saline ground water. OmegaWiki

The accumulation of soluble salts by evaporation of the waters that bore them to the soil zone, in a soil of an arid, poorly drained region. OmegaWiki

The accumulation of salt in soil. OmegaWiki