The sustainable agricultural production requires the application of water erosion control technologies, preserving and increasing of soil organic carbon, which is essential for improving soil quality and functions. А six-year experiment on the losses of organic carbon in traditional and erosion control tillage systems for wheat and maize cultivation on inclined agricultural lands through water erosion was conducted. The technologies that had been tested were conventional technology (CT) applied up and down the slope. Conventional technology applied transversely to the slope (CTA), surface mulching (SM), and minimum tillage with vertical mulching (MTVM). The technology, combining minimum tillage with vertical mulching for maize and wheat cultivation reduced significantly the volume of the water runoff, and losses of soil and organic carbon, compared to the traditionally cultivated crops. Organic carbon losses depended most strongly on the amount of eroded soil. In surface mulching treatment, more significant amounts of organic matter were removed by runoff. In contrast, organic matter incorporated by vertical mulching in slits retained in the soil. As a result, the sediment enrichment ratio was the highest in surface mulching treatments. The tillage system had strong influence on the sediment enrichment ratio, and the influence of the crop was not statistically significant.