Characterization of soil degradation and changes of soil quality are of great importance. The effects of the mismanagement in Puch experimental station (Germany), the differences between bio and conventional agriculture in the plots of Basilicata and Tuscany (Italy) and the effect of vegetation cover in Santomera field (Spain) were studied by rheological measurements. The rheological parameters were measured in suspensions containing as much water as equilibrium sediment can be retained during long standstill, introduced by Czibulya et al. (2010) as the water content of soil suspension in corresponding state (WCSSinCS). Rheological parameters were determined under soil relevant conditions (low shear, high viscosity), where surface properties of soil particles and composition of aqueous phase governed rheological behavior of suspensions, and were compared with parameters related to the organic matter content of soils such as total organic carbon (TOC), soil organic matter content (OM) and humic substances carbon (Chum) values measured within a European specific targeted research project (acronym: INDEX-GOCE-CT-2003505450) and it was explored that the flow ability of soil suspensions in corresponding state is influenced by liquefying and solidifying effects. The higher WCSSinCS indicates better water holding capacity of soils liquefies suspensions, since the number of particles in the unit volume of suspensions decreases. The increase of organic matter content can induce higher shear resistant aggregation structure only if adequate Ca 2+ -ion is available. The ratio of organic matter content to that of Ca 2+ -ion is also high, but its liquefying effect comes out for lack of Ca 2+ ions.