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SKLADANKA, J.: Leaf dynamics of Festulolium and Dactylis glomerata L. at the end of the growing season. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 4, pp. 273–280 The paper is focused on the assessment of leaf extension rate (LER), leaf appearance rate (LAR) and leaf senescence rate (LSR) in the Festulolium (Festuca arundinacea Schreb. × Lolium multifl orum Lam.) and in the Dactylis glomerata L. at the end of the growing season from the end of September to the beginning of December. In summer, the swards were used for a single cut (beginning of June) or for a double cut (beginning of June and end of July). Measurements were made in three periods from 14 Sept. to 11 Oct., from 11 Oct. to 29 Oct., and from 29 Oct. to 6 Dec. In the fi rst period, LER was higher in Dactylis glomerata L. (3.770 mm tiller−1 d−1) than in Festulolium (2.376 mm tiller−1 d−1). In the second and third period, LER was higher in Festulolium (0.859 resp. 0.271 mm tiller−1 d−1) than in Dactylis glomerata L. (0.694, resp. 0.199 mm tiller−1 d−1). LAR values measured in Festulolium in the studied pe riods were 0.277 leaf tiller−1 d−1, 0.079 leaf tiller−1 d−1 and 0.038 leaf tiller−1 d−1 and LAR values of Dactylis glomerata L. were 0.225 leaf tiller−1 d−1, 0.054 leaf tiller−1 d−1 and 0.027 leaf tiller−1 d−1. In the course of the whole period of study, LSR showed the highest values in Dactylis glomerata L. (7.869 mm til ler−1 d−1, 5.947 mm tiller−1 d−1 and 4.757 mm tiller−1 d−1) while the LSR values of Festulolium were lower (2.904 mm tiller−1 d−1, 2.375 mm tiller−1 d−1 and 1.205 mm tiller−1 d−1). The infl uence of both the species and the period of measurement on the LER, LAR and LSR values was statistically highly signifi cant (P < 0.01) to very highly signifi cant (P < 0.001). The interaction between the species and the period of measurement was very highly signifi cant (P < 0.001) in the LER characteristic. The infl uence of the intensity of sward use in summer on the LSR values was very highly signifi cant (P < 0.001), too. leaf extension rate, leaf senescence rate, leaf appearance rate, Festulolium, cocksfoot Swards intended for extension of the grazing period require grass species resistant to cold. This is a challenge for hybrids of Festuca arundinacea Schreb. and Lolium multifl orum Lam. (OPITZ VON BOBERFELD and BANZHAF, 2006). A basic unit of production in the grass community is tiller. Density and volu me of tillers determine biomass production. Leaf appearance rate, leaf extension rate and leaf senescence rate are key components determining the tiller volume during vegetation (VIRKAJARVI and JARVENRANTA, 2001). The growth of grasses culminates at the turn of May and June while the growth rate decreases at the end of the growing season. Nevertheless, the growth of new leaves and the decay of older leaves may continue during winter, too (HENNESSY et al., 2004). These components were studied by various authors in Festuca arundinacea Schreb. (ZARROUGH et al., 1984; SKINNER and NELSON, 1995), in Lolium perenne L. (GAUTIER et al., 1999; HENNESSY et al., 2004), Phleum pratense L. or Festuca pratensis Huds. (VIRKAJARVI and JARVENRANTA, 2001). However, data are missing for the conditions of Central Europe and for other species suitable for a possible extension of the grazing period. In this connexion, some festucoid hybrids come into consideration (Festuca arundinacea Schreb. × Lolium multifl orum Lam.), which combine the resistance to low temperatures of the Festuca sp. and the high herbage quality of the Lolium sp. (CASLER et al., 2002). REGAL and SINDELAŘOVA (1970) mentioned swards with the dominance of Dactylis glomerata, which can be used in the late autumn.