Abstract
The formation and transportation of the various phosphate species according to the chemical principle of solubility product. following the order, calcium, aluminium and occluded phosphates, corresponding to the increasing stages in a weathering sequence, are due to differences in stability. As the soils of Nilgiris district are found under a wide range of rainfall and elevations, a study of the various stages of chemical weathering wag undertaken. It showed that weathering has been hindered at one stage of chemical weathering or the other in many places. Some soils were in advanced stages of chemical weathering.
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