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The effect of ameliorating doses of hard coal fly ash (HCFA) on chemical properties of soil and on yields and chemical composition of crops was examined based on an experiment established in 1984. At first, typical agricultural crops were grown in the experiment, but in 1992 the field was turned into permanent grassland. The current study took place twenty-nine years after hard coal fly ash had been applied. Soil samples were collected from the 0–20 cm soil layer, corresponding to the compared treatments. The residual effect of HCFA doses increasing from 100 to 800 Mg·ha-1 caused a regular increase in the total content of Cd, Cr, Cu, Mn, Fe, Zn and Pb, as well as the forms of Zn, Cu, Mn, Fe and B soluble in 0.1 M HCl. The total content of the analyzed microelements increased by a maximum of 30% for cadmium up to 176% for zinc. The highest increase in the content of soluble forms ranged from 25% for Fe to 760% for boron. The share of Znbd, i.e. permanently bound to soil, to Zntot, i.e. the total zinc form, was positively correlated with pH in KCl, the C:N ratio and the content of Cu permanently bound with soil. Regarding the share of Febd in Fetot, correlations with pH in H2O and in KCl, content of organic matter (SOM) and the C:N ratio were demonstrated. No such correlations were proven with respect to the other elements. W doświadczeniu zalozonym w 1984 roku badano dzialanie melioracyjnych dawek popiolow ze spalania wegla kamiennego (hard coal fly ashes – HCFA) na wlaściwości fizykochemiczne gleby oraz na plonowanie i sklad chemiczny roślin uprawnych. W pierwszych latach badan uprawiano typowe rośliny rolnicze, a w 1992 zmieniono charakter uprawy na trwaly uzytek zielony. Obecne badania wykonano po dwudziestu dziewieciu latach od zastosowania HCFA. Probki gleby pobrano z poziomu 0–20 cm w nawiązaniu do porownywanych obiektow. Nastepcze dzialanie rosnących dawek HCFA od 100 do 800 Mg·ha-1 powodowalo zarowno wyraźnie regularny wzrost zawartości calkowitej – Cd, Cr, Cu, Mn, Fe, Zn i Pb, jak i form rozpuszczalnych w 0.1 M HCl – Zn, Cu, Mn, Fe i B. Zawartośc calkowita rozpatrywanych mikroskladnikow maksymalnie wzrosla o 30% w przypadku kadmu do 176 % w odniesieniu do cynku. Maksymalny wzrost zawartości form rozpuszczalnych ksztaltowal sie od 25 % w odniesieniu do zelaza do 760 % w przypadku boru. Udzial Znbd tj. trwale związanego z glebą w stosunku do jego formy ogolnej Zntot, istotnie dodatnio korelowal z pH w KCl i stosunek C:N oraz z Cu trwale związaną z glebą. W odniesieniu do udzialu Febd w Fetot wykazano korelacje z pH w H2O, pH w KCl, SOM i C:N ratio. W odniesieniu do pozostalych badanych pierwiastkow takich zalezności nie wykazano.

THE LONG-TERM IMPACT OF AMELIORATING DOSES OF HARD COAL FLY ASH ON SHAPING THE CONTENT OF SELECTED MICROELEMENTS IN AGRICULTURAL SOIL