Salinization

Salinization is the accumulation of dissolved salts in soil or water. It can impair plant growth, degrade freshwater resources, and alter aquatic ecosystems.

Evapotranspiration: The transfer of water from land to the atmosphere through evaporation and plant transpiration. Water loss concentrates salts left behind in soil.
Soil salinity: The concentration of dissolved salts in soil, commonly assessed in the soil solution or an extract. It is the soil-specific form of salinization that directly exposes roots to salts.
Electrical conductivity: A measure of how readily a material conducts electric current, often used to estimate dissolved-ion concentration in water or soil extracts. It provides a practical indicator of salinity in soil and irrigation water.
Primary salinization: Salt accumulation caused by natural processes such as weathering, saline groundwater, or marine influence. It distinguishes naturally driven salt accumulation from human-caused cases.
Murray–Darling Basin: A large Australian river basin where irrigation and land clearing have contributed to dryland and irrigation salinity. Its salinity problems connect altered water balance with agricultural and river impacts.
Irrigation: The artificial application of water to land or crops. Irrigation water can add salts, especially where drainage is insufficient.
Sodicity: A soil condition marked by excessive exchangeable sodium relative to other cations. Sodium can disperse soil particles, compounding damage where salinity occurs.
Sodium adsorption ratio: An index comparing sodium concentration with calcium and magnesium concentrations in irrigation water or soil extract. It helps assess sodium-related soil hazards alongside salinity.
Secondary salinization: Salt accumulation caused or intensified by human activities, especially irrigation and inadequate drainage. It identifies the major management-driven pathway to agricultural salinity.
Aral Sea: An endorheic lake in Central Asia that shrank dramatically after river water was diverted for irrigation. The shrinking lake left exposed, salt-laden sediments that contribute to regional pollution.

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