EN
The present studies were carried out on the basis of field experiment on the strongly acidic soil (pH 3.9). The following treatments were applied: liming, fertilization with manure and nitrogen in the form of ammonium (NH₄)₂SO₄ and nitrate Ca(NO₃)₂ forms of nitrogen, as well as sulphate K₂SO₄ and chloride KCl potassium fertilizers. Liming (CaCO₃) eliminated the effect of aluminium mobilization by (NH₄)₂SO₄. Calcium nitrate Ca(NO₃)₂ and potassium salt KCl limited the content of aluminium strongly bound to the soil organic matter.