Salinity, often induced by excess application of chloride, can destroy agricultural land and seriously reduce water quality, particularly in arid and semi-arid regions where limited rainfall is unable to cleanse the soil. In many regions of the worldsoil sa-linisation is a serious threat to agriculture. Soil salinity comes from salt deposited in areas that were originally under the sea in geological times, from natural salinisation caused by weathering of rocks containing salt, from anthropogenic salinisation induced by improper land and irrigation management, and from inadequate or inappropriate fertilizer use.
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