[Perennial ryegras and smooth meadow-gras in Middle-Norway - preliminary results]

contenido de materia seca contenido proteico cosecha crop yield dry matter content ensayos de variedades feed grasses feed production foin grazing harvesting hay heno lolium perenne noruega norway nutritive value pastoreo performance testing poa pratensis production aliment pour animaux protein content pruebas de rendimiento rendement des cultures rendimiento de cultivos valeur nutritive valor nutritivo variety trials