EN
The aim of the studies was estimation usefulness of Arrhenatherum elatius and Lolium perenne for renovation by reseeding of moderately dry meadows. Estimation of some of biological features of those species such as: rate of emergence and tillering, development of above ground and underground biomasses, tillering intensity, vertical distribution of above ground biomass in the yields and ability to remain after reseeding was done. Three series of studies were carried out: pot experiments out in vegetative hall of Institute of Land Reclamation and Grassland Farming in Falenty; field experiments: pure stands and reseeding of degraded meadow after two times cultivation of the old sward using single species and mixture. Field experiments were carried out in experimental station of SGGW Grassland Department in Jaktorów, in the natural moderately dry meadow site. Cv. Wiwena of Arrhenatherum elatius and cv. Argona of Lolium perenne were studied. Two dates of sowing: spring and late-summer were using. It was found that cv. Wiwena of Arrhenatherum elatius and cv. Argona of Lolium perenne were suitable for reseeding of moderately dry meadows. They had fast growth and development rates after sowing. Arrhenatherum elatius has ability to good remains in the following years after reseeding. Lolium perenne is characterized by great competition only in the first year after reseeding whereas its persistence is not good enough in the following years. Moreover it was found that spring term was better for reseeding of moderately dry meadows. It guarantees better development of plant biomasses both above ground and underground. Irrespective of sowing date proper soil moisture is favourable to plant development and it is support to achieve success of reseeding.