The result of experiment conducted on three nutrient management practices , two age of seedlings and three spacings on System of Rice Intensification revealed no significant difference in different nutrient management practices on grain yield of rice under System of rice intensification, however Integrated source of nutrient i.e., 50%RD+ FYM10 tha^-1 resulted in maximum grain yield of rice as compared to organic source i.e FYM 20 t ha^-1 and Recommended dose of fertilizer. Planting of 15 days old seedling produced significantly higher yield than 10 days old seedling. Spacing of 20x20 cm produced significantly higher yield than 25x25 cm. spacing in an iron toxic soil .