Soil test crop response studies were conducted in red lateritic soil of the Regional Research Station, Vridhachalam. Fertility gradients were created and different levels of NPK were applied. VRII groundnut was raised as test crop. Based on yield of pod and haulm, available nutrient contents in soil at harvest stage and uptake of principal plant nutrient elements crop response equations were developed. Test verification of these equations for their applicability revealed that these fertiliser prescription equations hold good at lower levels of targeted yield upto 20 g/ha beyond which there is deminished response to the applied nutrients.
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