Abstract

Field experiments were conducted in Vertic Ustochrept to find out the feasibility of adoption of soil test based fertiliser recommendations for rainfed sorghum. Fifty per cent of NPK fertilisers recommended for irrigated sorghum, as per targeted yield and Mitscherlich-Bray concept were applied to rainfed sorghum and these two methods were compared with blanket recommendation. Results showed that targeted yield approach recorded higher yield, response yardstick and benefit cost ratio than Mitscherlich-Bray and blanket recommendations. Hence, for better fertiliser use efficiency, yield and profit. 50 per cent of NPK prescribed for any desired yield targets of irrigated sorghum could be recommended for rainfed crop. in the mixed black soils of Western Zone of Tamil Nadu.

Keywords: Soil test based fertiliser doses, response yardstick. Benefit Cost Ratio