EJSSEurasian Journal of Soil ScienceEurasian J Soil Sci2147 - 4249Federation of Eurasian Soil Science Societieshttp://ejss.fesss.org/10.18393/ejss.30451910.18393/ejss.304519Clay activity index as an indicator of soil erodibilityNutullah Özdemir Coşkun Gülser cgulser@omu.edu.tr64307-3112017-01-042017-04-022017-04-072017-09-18 Copyright © 2016 The authors and Federation of Eurasian Soil Science Societies Activity index (AI) value characterizes the relationship between the plasticity index and clay content. In this study, AI value was investigated to determine whether it might be used as an indicator of soil structural stability or not. The AI values of 75 soil samples gave the significant negative correlations with their dispersion ratio (DR), soil erodibility factors (K) and erosion ratios (ER). Also, the AI values of the soils including clay and sandy clay loam textural class showed significant positive correlation with soil structural stability index (SSI). It seems that the AI value may be used as an indicator of soil structural stability.AI value, erosion ratio, soil erodibility, structure stability index.