The purpose of the present investigation is to study the phenomena of anion exchange capacity on the lateritic soils of Nanjanad (The Nilgiris). When the study of response of crops to application of different nutrients began, it was discovered that many soils were deficient in supplies of available phosphorus. In most of the soils the total quantity of the phosphorus was low being less than about 0-0075 per cent. When phosphorus in the form of superphosphate was applied on the surface of these soils, about 80 to 90 per cent of added phosphate was fixed and the rest turned to unavailable form.
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