Report from the International Occasional Symposium of the European Grassland Federation, Thessaloniki, Greece, 27-29 May 1999

agroforesteria agroforesterie agroforestry arbuste arbustos competición vegetal compétition végétale conduite des herbages cultivation cultivo grassland management manejo de praderas plant competition plantas leñosas plante ligneuse pratique culturale shrubs silvopastoral systems système sylvopastoral woody plants