This study was conducted to identify the proportion of the contribution of mineral and organic soil components in the values of Cation exchange capacity in some soils with high organic content and compare them with soils with low organic content. To achieve this goal, seven sites were selected for each surface and subsurface samples. Selected sites included Al-Dalmach marsh in Wasit governorate and the marshes soils in Misan governorate included(Al-Azim, Al-sanaf ,Um Naaj and Al-Sudda), as well as one soil site in Diwaniyah governorate, samples of surface and subsurface from all above mentioned sites were collected, dried, grinded and sevied through 2mm opening sieve
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