Influence of fertilization on the content of some aluminium fractions in acidic soils

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.