This study defines an indicator of soil potential stability (n-potential) allowing the most effective
practices in terms of soil stability and capacity to store organic carbon to be selected. By relating the clay
content to SOC content, the n-potential indicates the “potential” presence of non-complexed clay (NCC) in
soils, enabling the soil stability and its capacity to store carbon (C) to be inferred. In this work, we classify
soils of European regions based on five n-potential categories (i.e. >20; 15–20; 10–15; 5–10;