Soil salinization is defined as the increase in water-soluble salts in soil which is responsible for increasing the osmotic pressure of the soil. In turn, this negatively affects plant growth because less water is made available to plants.

Source:

“Status of the World's Soil Resources. Main Report |Policy Support and Governance| Food and Agriculture Organization of the United Nations .” Food and Agriculture Organization of the United Nations (FAO) and Intergovernmental Technical Panel on Soils (ITPS), 2015.