Evaluation of a collection of perennial ryegrass (Lolium perenne) grown as a forage crop

agronomic characters composition globale contenido de materia seca crop yield disease resistance drechslera dry matter content enfermedades fungosas fauchage feed crops fungal diseases lolium perenne maladie fongique meadows mowing plantas forrajeras prados de siega prairie de fauche proximate composition puccinia coronata rendement des cultures rendimiento de cultivos resistencia a la enfermedad siega variedades varieties