EN
Basing upon 8-years results of field experiments with NPK Mg and NPK MgCa fertilizers, and also the influence of soil menagement reaction of pH value and hydrolitic acidity has been determinated. Forest soil had the highest hydrolitic acidity than the cultivated soils. Reaction pH value was the smallest. Liming decreased the hydrolitic acility and increased pH value in loessial soils. NPK Mg feltilizers decreased of pH value and increased hydrolitic acility.