Effect of water stress on grass species in sown permanent swards

  • Giovanni Peratoner
    Versuchszentrum Laimburg, Laimburg 6, Pfatten, 39040 Auer, (BZ), Italy
  • Martina Querini
    Versuchszentrum Laimburg, Laimburg 6, Pfatten, 39040 Auer, (BZ), Italy
  • Ulrich Vigl
    Versuchszentrum Laimburg, Laimburg 6, Pfatten, 39040 Auer, (BZ), Italy
Abstract: Grass species are expected to show a species-specic response to drought. Two seed mixtures, containing grass species in di€erent proportions, were investigated in a four-year eld experiment at two droughtendangered sites: 835 m a.s.l. (low altitude) and 1,205 m a.s.l. (high altitude). ree cutting frequencies (2, 3 or 4 cuts year-1) coupled with increasing fertilization rates (equivalent to 1, 1.4 or 2 livestock units ha-1) were applied. Just before the rst cut, the yield proportion of each species was assessed. Drought indices, based on cumulated precipitation and evapotranspiration, were computed for each regrowth based on meteorological data and the e€ect of drought was explored. e e€ect of drought on the yield proportion of the sown grasses was quantied by means of mixed models accounting for design e€ects, the abovementioned factors and the cumulated water stress (CWS), for both the growth period until the rst cut and the growth period corresponding to the last regrowth of the previous growing season. All species were a€ected by CWS. As expected, Arrhenatherum elatius and Festuca arundinacea increased their yield proportion under high water stress. e opposite was observed for Lolium perenne, whilst a less clear response was obtained for the remaining grass species.
Schlagwörter: grasses, water stress, sown swards, yield proportion
Publikationjahr: 2019
Veröffentlich in: Grassland Science in Europe
Ausgabe: 24
Publikationssprache: de
Erste Seite: 176
Letzte Seite: 178