Possibilities of reconstruction and maintaining a beneficial production potential of permanent grasslands in the Bydgoszcz Canal Valley

Under sowing with a multi-specific grass and papilionaceous mixture has appeared to be an effective method of renewing a meadow non-fertilised for more than 20 years, located on the post-bog soil. In the 6-year research period the best botanical composition and the highest yield-forming effectiveness were recorded for the treatment which involved the fertilisation with phosphorus and potassium. It was Dactylis glomerata which was the most dynamic species. A considerable share in the plant communities, formed as a result of a varied fertilisation, was also made up, depending on the level of fertilisation, by Lolium perenne, Phleum pratense, Agrostis gigantea, Agrostis stolonifera, Poa trivialis, Deschampsia caespitosa and Urtica dioica. The fertilisation with 120 kg N ha–1 and complete abandoning of fertilisation were especially unfavourable for the sward composition. A considerable share of non-sown dicotyledonous plants was eliminated in the fourth year of research with Fernando 225 EC herbicide