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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
Dryland Salinity is the process that degrades land due to an increase in soil salt concentration. Being in excess of normal soil salt concentrations makes it harder for plants to take water from the soil and eventually they die from dehydration, leaving patches of soil with no ground cover. Clearing deep-rooted perennial native vegetation and replacing it with shallow rooted annual plants. 2  The shallow roots are no longer able to utilise the excess runoff, and it now seeps past the roots zone to enter the groundwater system.