ABSTRACT
Several agricultural activities and dynamics of terrestrial ecosystems play a major role in greenhouse gas emissions. Soils can be a major source of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) emissions to the atmosphere. In contrast, soils can be purposefully managed to render them as an effective sink. Atmospheric concentration of greenhouse gases is an important aspect of air quality which will gain importance with time. World soil resources will be increasingly used to serve as a sink for atmospheric carbon. The maximum or equilibrium level of soil organic carbon content within an ecosystem depends on land use, farming/cropping system, and soil and crop management. Enhancement of soil structure through increasing total aggregation is an important strategy to sequester carbon in soil. Increasing total aggregation and relative proportion of micro-aggregates can immobilize large quantity of carbon, especially if increase in micro-aggregation can be achieved for the sub-soil horizons.
