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Soil salinity. Soil salinity is the salt content in the soil; the process of increasing the salt content is known as salinization. Salts occur naturally within soils and water. Salination can be caused by natural processes such as mineral weathering or by the gradual withdrawal of an ocean. It can also come about through artificial processes such as irrigation
As a result, the concentration of salts in water with a relatively low starting salinity (TDS) can increase simply due to evaporation. Irrigation can result in significant increases in salinity through evaporative enrichment. Water uptake by plants can also increase soil salinity.