Agriculture occupies a larger portion of global land area (about 35%) than any other human activity (Betts and Falloon, 2007). Agriculture soil stocks have been suggested as potential measure to sequester atmospheric CO2 to help stabilize its concentration in atmosphere and has been estimated that 0.4-0.9 Pg C year-1 can be sequestrated within global agricultural soils (Paustian et al., 1998). This has been supported by the fourth assessment made by the Intergovernmental Panel on Climate Change, that identified agriculture as among the economic sectors having the greatest near-term (by 2030) greenhouse gas mitigation potential, largely via soil organic carbon (SOC) sequestration (Smith et al.,2007).
However, currently, there is much uncertainty and debate due to uncertainties associated with quantifying the impact of the various crop management practices on green house gas emission ,the spatial and temporal scales involved in quantifying greenhouse gas emissions from, and C sequestration in, agro-ecosystems, uncertainty of future climatic conditions that affect type of crop management systems influencing primary productivity that makes it very difficult to obtain accurate estimates of the GHG emission or C sink values (Hutchinson et., 2007).
The objective of this paper is to
Agricultural Sequestration Potential.
Traditional agriculture requires a management system that fosters dependable yields of a monoculture crop for food, fuel or fiber by controlling weeds, preparing uniform seed bed, and ensuring sufficient nutrient and water supplies. However, these disturbances also deplete carbon stocks in agricultural systems (Smith et al., 2008). Tillage is used to enhance seed beds and controls...