Soil erosion by water reduces soil fertility and increases water contamination. The aim of this work is to compare two soil management in vineyards in order to determine the size of soil degradation. The hypothesis is that the grassed vineyard has a better soil structure and less erosion runoff and loss of phosphorus. The aim is to determine agrotechnical measures that reduce soil degradation and loss of nutrients on inclined lands. Rainfall simulation experiments (intensity 60 mm/hour) were used to determine the extent of erosion in vineyards (tilled, grass-covered) near Orahovica, but also potential pollution by eroded phosphorus. Physical properties of the soil and sediment loss and phosphorus content have been determined. The results showed that the bulk density was significantly higher on the grass-covered treatment, while the soil water capacity (Pkv) was significantly lower. As for soil moisture (Trv), no significant difference was found between treatments. The mean weight diameter (SVSA), the percentage of water stable aggregates (UVSA) and organic matter (OT) had higher values on the grass-covered treatment than at the tilled treatment. The time to ponding (ts), the loss of sediments and phosphorus was significantly greater on the grass-covered treatment. The correlation between variables indicated that in both treatments (grass-covered and tilled) there was a complete negative correlation between infiltration (Iv) and runoff (Ov), and that sediment loss and phosphorus loss were very strong correlated. The results of this study confirmed the hypothesis that the grass-covered vineyard management improves the soil structure and reduces runoff, erosion and phosphorus loss.