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Estimation of soil organic carbon (SOC) stocks requires estimates of thecarbon content, bulk density, rock fragment content and depth of a respectivesoil layer. However, different application of these parameters couldintroduce a considerable bias. Here, we explain why three out of fourfrequently applied methods overestimate SOC stocks. In soils rich in rockfragments (> 30 vol. %), SOC stocks could be overestimatedby more than 100 %, as revealed by using German Agricultural SoilInventory data. Due to relatively low rock fragments content, the meansystematic overestimation for German agricultural soils was 2.1–10.1 %for three different commonly used equations. The equation ensemble asre-formulated here might help to unify SOC stock determination and avoidoverestimation in future studies

Soil organic carbon stocks are systematically overestimated by misuse of the parameters bulk density and rock fragment content