Mozliwosci poprawy skladu florystycznego runi i plonowania uzytkow zielonych w Sudetach poprzez podsiew i zasiew

The paper presents results of experiments on reseeding and complementary seeding on grasslands in the Sudety Mountains carried out in the Wrocław branch in the Institute for Land Reclamation and Grassland Farming. Experiments with one or two factors were performed in various soil and natural habitats: at 400 and 600 m a.s.l. and on good and poor soil. Different methods of cultivation were used: cultivation with a plough, a rotovator, a disc harrow, as well as direct sowing of seeds on existing sward or sward destroyed with Roundup. The species under investigation were: Dactylis glomerata, Phleum pratense, Lolium perenne, Festuca pratense and Festuca arundinacea with addition of Trifolium repens and their mixtures. It was found that in the areas located in valleys, characterised by favourable conditions sowing with single species or seed mixtures can play a significant role in grassland management because of higher yielding in comparison with natural swards in two first years after sowing as well as various periods of establishing and development into mature sward. In higher altitude zones (above 600 m a.s.l.) less expensive methods (namely fertilising) of sward renovation should be taken into account or the areas should be excluded from agricultural use.