EN
The aim of this study was to evaluate the development and biological features of Dactylis glomerata varieties grown for seeds depending on the course of precipitations and temperature. The studies were carried out in 2002–2006 in central Poland. Experiment was established as a split-plot design on plots of 3 m2 in four replications. The seeds of six varieties of Dactylis glomerata with different earliness and the ways of utilization were sown in June at rate 0.5 g m–2 in two row spacings (50 and 70 cm). The following parameters were analyzed: cover of surface (spring), height of plants (spring and in the term of seed harvest – generative and vegetative shoots) and share of generative shoots in the aboveground. It was found that examined varieties were characterized by a considerable diversification of their grow and development depending on weather conditions.