The traditional and subsistence farming system of rice production accompanied with huge soil loss and burning of phyto-biomass in the North-East (NE) India calls for the improved technology of crop production and soil health. The soil organic carbon (SOC) is indispensable for soil fertility and crop production. Its content varies with the topographical settings, soil erosion and subsistence nature of farming. The different SOC pools behave differently with crop production and fertility management practices. Therefore, an experiment was conducted at CPGS research farm for understanding the different SOC pools in rice production with five treatments on nutrient management (INM) [Control (T1), 100% FYM @ 10 t/ha (T2), 100% NPK @ 80:60:40 kgha-1 (T3), 50% FYM +50% NPK of the recommended dose (T4), FYM + 100% NPK of the recommended dose (T5)] in randomized block design (RBD). Soil moisture content in the surface layer (0-15 cm) was 12.57% more than in the sub-surface (15-30) cm soil. BD was higher in subsurface than surface surface soil and negatively correlated with FYM / organic matter. Addition of 10 t ha-1 FYM along with100% NPK recorded an inprovement in CEC and pH as compare to other treatments. It also resulted in higher value of SOC and available NPK at both the soil depth (0-15) cm and 15-30 cm). The value of 00C1, 00C2, 00C3, 00C4, POM, MBC, DOC, HWC and WC incresed with the addition of organic manure (FYM). All the treatments improved rice productivity over the control of but the effect of FYM / inorganic fertilizers alone had same effect on rice production. Application of 10 t ha-1 along with 100% NPK (T5) produced highest grain yield (2.16-4.1 t ha-1) and straw yield (7.18-8.03 t ha-1) and harvest index (0.23-0.34) as well. FYM / inorganic fertilizer alone have the same effect on rice productivity. NPK content and uptake was higher at T5 while other treatments were found to have similar effect for NPK content and uptake in grain and straw. OOC1, OOC2, OOC3, OOC4, POM, MBC, HWC, WC and OC show significant and strong positive correlations with grain yield at 0-15 cm. At 15-30 cm OOC2, OOC3, OOC4, POM, MBC, DOC, HWC, WC and OC show significant and strong positive correlations with grain and straw yield. All the fertilized treatments had recorded greater value for different SOC pools as compared to the control. However, application of FYM / inorganic fertilizer or 50% recommended dose of FYM+NPK (T2, T3 and T4) has the similar effect and had lower value than the 100% recommended dose of FYM+NPK (T5). Therefore, it was suggested 100% recommended dose of FYM+NPK (T5) for higher crop productivity, enhancing nutrient availability and sustaining soil carbon pools for such soil type and topographical settings.