Research carried out on the wet ash disposal site of the Adamów power plant in Turek assessed the growth of selected tree species used for the biological reclamation of the disposal site. Ash rock on seventeen experimental plots was covered with a layer of sludge or boulder clay and in some variants the chemistry of the substrate was improved by additional NPK or N fertilisation. Biometrical measurements included the height of trees, the number and diameter of stems, and the length of the annual increments of shoots. Robinia pseudoacacia and Eleagnus angustifolius performed better than Acer negundo: the trees of the two former species were higher, produced more stems of larger diameters and had longer annual increments. All the tree species under study achieved significantly higher values of biometrical characteristics on substrates enriched with a layer of boulder clay. Mineral fertilisation had an ambiguous effect on the relations between the characteristics studied.

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