A model to simulate tiller dynamics of perennial forage grasses under severe Mediterranean drought
2008
Satger, S.; Volaire, F.; Lelièvre, F., Institut National de la Recherche Agronomique, Montpellier (France). Unité Mixte de Recherche, Élevage des Ruminants en Régions Chaudes | Ruget, F., Institut National de la Recherche Agronomique, Avignon (France). Unité Climat, Sol, Environnement | Brisson, N., Institut National de la Recherche Agronomique, Avignon (France). Unité AgroClim
The STICS crop model is used to simulate growth and forage production of grass pastures in cool temperate conditions (INRA France, www.avignon.inra.fr/stics/). To extend it to Mediterranean areas and to use it to anticipate future effects of the global warming, its forecasting performances during hot dry summers need to be improved, especially by taking into account variations of plant and tiller densities. The adapted formalism dealt with four successive phases: (a,b) cessation of leaf growth and plant development, followed by progressive lamina senescence, computed as a function of soil water deficit; (c) progressive tiller mortality, as a function of the actual/potential evapotranspiration ratio at individual tiller level; and (d) sward growth and tillering rates after autumn rainfalls, as a function of surviving tiller density, remaining leaf area index, and plant reserves at the end of the drought period. The model will be parameterized and tested for different species and types of cultivars. Future developments will aim to simulate the evolutions of plant densities of bi- or tri-specific mixtures
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