In period 1999-2001 we have balanced yield forming potential of texturally medium heavy soils of Slovakia within the partial task Soil nutrient potential in relationship to yield formation and fertilization strategy. We have ascertained, most of medium heavy Haplic Chernozems calcaric, Mollic Fluvisols calcaric has been permanently keeping high fertility potential from the view of soil reaction, humus amount and quantity, and nutritional offer. To fertile soils can be included also some Luvi-haplic Chernozems, Mollic Fluvisols, Eutric Fluvisols, Calcaric Fluvisols, and Haplic Luvisols, particularly at higher N, P, K nutrients levels. Less fertile Eutric Cambisols, Dystric Planosols and Albic Luvisols. Statistically significant correlations among soil parameters, i.e.soil reaction, humus, humus quality (HA:FA, C:N), total nitrogen, available phosphorus and potassium are materialized assessment of yield bringing soil potencial.