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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
More than half of the dry areas worldwide are. affected by land degradation (Dregne and Chou, 1994). Although water erosion is the. dominant human-induced soil degradation process, an extent of 0.8 million km2 suffers from. secondary salinization caused by land mismanagement, with 58% of these in irrigated areas. alone, and nearly 20% of all irrigated land is salt affected (Ghassemi et al ., 1995).