Abstract
The Coimbatore district in southern India consists of igneous rocks. As ground water is used for irrigation it is often subject to intense evapotranspiration and cations are removed from solution when the water is concentrated by this process. The ability of the soil to pick up cations is due to the formation of new clay minerals and the precipitation of calcite. This is an indication that leaching has occurred to a greater extent in the past. Owing to the intensified irrigation and the absence of ground water runoff there is a risk that the ground water in low-lying parts of the area will become increasingly saline in the future.
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