**9. Conclusions**

Global warming is an atmospheric challenge that limit the efficiency of food production across the globe. It determines carbon sink its availability in the soil. Agricultural farmland is an important pool for carbon sink and deposit. Organic matter enhances water retention and nutrient built up in the soil. It cut down the input mineral fertilizer. It provides carbon stability and crop yield. Soil carbon accumulation largely depend on the rate at which biomass decomposes. Approximately 40% - 60% carbon are lost through conventional tillage. It regulates the extent to which chemical constituent is released into the soil. Plowing exposes the soil to direct insolation which may support rapid deposition. Erosion prevents direct oxidation of carbon into CO2. Carbon sequestration is high with crop that have abundant residue. The no-till practice perform the function of deepening carbon into the soil. A land cover with forest is significant to accumulating carbon and nitrogen in the soil. The nutritional quality of crop is lowered with increased atmospheric CO2. The growth of the plant and natural storage of carbon in the soil serves as defense against climate change. Peatland is capable of striking balance between vegetation and carbon reservoir. Perennial crop prevents environmental degradation such as erosion and soil compaction. Digestate is an excellent fertilizer that can enhance the biological properties of the soil. The higher digestate, the larger the SOC vice versa. Straw carbon transformation can activate microbial community such as bacteria, archaea, protozoa, fungus, and viruses. Multiple linear regression is a multidimensional software. It built a relationship between SOC stock and soil properties. Other software used for determining SOC are CENTURY soil organic matter model, EPIC model, Roth C-26.3 and the STIC model.
