Fertilized soils used for growing subsequently corn, winter wheat and sugar beet were analyzed for P2O5, K2O and Mg as well as for pH after harvest in field expts. in 2007-2017 to evaluate the need for variable application of mineral fertilizers. The level of absorbable forms of K, Mg and P contents in soil varied and was dependent on the soil pH, but the ay. nutrient contents remained at medium and high levels, while the soil pH(KCl) was slightly acidic or neutral. A big convergence between the expected and obtained ay. crop was found.