Abstract
Soil test crop response correlation studies is recognised as the best way to select soil tests for a region in the estimation of available nutrients. In Madras State, Olsen's method is used for the estimation of available P as a result of correlation studies conducted at the Indian Agricultural Research Institute, on an All-India basis. However, region- wise detailed correlation studies need be conducted in large States like Madras with widely varying soils, such as alluvial, red, black and laterite.
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