The soil organic carbon (SOC) content depends strongly on soil management and especially the level and quality of organic restitution to the soil. The SOC pool is the net result of carbon (C) input in the form of crop residue and biomass, and output including CO2 flux and other losses (Duiker, 2000). Changes in soil management can alter SOC content. A substantial increase in the SOC content in the 10 cm topsoil layer in no-tillagesoils compared with soils under natural vegetation and long-term conventional tillage (CT) (Séguy et al. 2003 ) can occur due to high crop-residue input and lack of soil disturbance.