study the effect of dry farming management on quantity and distribution of soil organic matter in mereg watershed in kermanshah province

soil organic carbon is a key factor in productivity and quality of soil and environment particularly in semi arid regions. in this article, the role of farm soil organic matter management in soil and in land is discussed. the variability of soil organic carbon in drylands is mainly controlled by tillage and crop residue management. results of this study indicated that usage of correct tillage method and residue management can sequester about 35 ton of atmospheric carbon per hectare of drylands in semiarid regions.