The objectivc of the paper is to evaluate the influence of soil erosion on soil morphology of Luvisols and Phaeozems, soil properties and crop yields. Depth of soil profiles and genetic horizons are analysed during field research in order to determine a truncation extent of eroded soils in comparison with the model profile of non-eroded soil. A characteristic feature of the soil cover in loess and moraine areas is the mosaic-type differentiation of the non-eroded soils, soils of various erosion classes, and colluvial deposits on the slopes and foothills. This variability is the effect of the levelling off of the original micro-relief of the loess surface through tillage erosion. Destruction of soil genetic horizons is accompanied by depletion of humus substances and nutrients in soil. In contrast to non-eroded soils, Ap horizons of eroded soils developed from illuvial horizons or parent material have poorer aggregation, aggregate water stability and less favourable water-air properties. As a result of small aggregate water stability, eroded soils are susceptible to crusting and further water erosion during periods of heavy runoff. Also, erosion tend to destroy crop plants and to leach plant protection chemicals. Affecting crops and soil fertility, erosion contributes to large losses of crop yields.