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The fertilizer adjustment equations evolved during previous season for the Swarna variety of rice was tested and fertilizer application with organic source (FYM). It was also noticed that fertilizer dose applied based on STCR prescription derived previously to achieve a definite yield target could not be obtained. This may be due to differences in various input use efficiency, nutritional requirement. | Validation and refinement of soil test based derieved fertilizer equation for SRI rice in vertisol