EN
The growth and development of Lolium perenne L., Festuca rubra L., Poa pratensis L., Dactylis glomerata L., Bromus inermis Leyss. and Trifolium repens L. were tested in pot experiments on the following media: A - 100% ash, B - 75% ash + 25% biohumus; C- 50% ash + 50% biohumus; D- 25% ash + 75% biohumus; E - 100% ash + 48 kg ha⁻¹ N-ammonium nitrate; F - 100% ash + 72 kg ha⁻¹ N-ammonium nitrate; G - 100% ash + 48 kg ha⁻¹ N-ammonium nitrate; H - 100% ash + 48 kg ha⁻¹ N-ammonium nitrate + additional water supply to 60% field water capacity. The ash, being a mixture of ash and slag, was produced from coal by the „Dolna Odra" power plant and stored in Nowe Czarnowo. The biohumus came from the sewage treatment plant in Pyrzyce. The study has shown that the addition of organic matter (even at the lowest dose of 25%) had a better effect on the growth of the plants than the mineral nitrogen added to the medium. On the applied mineral nitrogen, the ammonium sulphate was better than the nitrate. A double cutting had also a positive effect on the plant growth, beside the treatments applied. As plants best suitable for the covering of cinder dumps enriched by the addition of organie matter or mineral nitrogen, low growing grasses of the loose cluster - tillering type, such as Poa pratensis, Festuca rubra and the papilionaceous species Trifolium repens were found to be proper. Less useful were high grasses and of the tillering-runners type - Bromus inermis.