Abstract

In areas of low rainfall, salts formed during the weathering of soil minerals are not fully leached. Under humid conditions the soluble salts originally present in soil materials and those formed by the weathering of minerals are generally carried downward into the ground water and are transported ultimately to the oceans. Saline soils are, therefore, practically non-existent in humid regions. Conversely, saline soils occur in arid regions not only because there is less rainfall available to leach and transport the salts, but also because of the high evaporation rates characteristic of arid climates which tend to further concentrate the salts in soils and in surface waters.

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