Utilization of selected genotypes of spring barley as forage nurse crops in potato-growing and montaneous regions of southern Bohemia

altura composition globale contenido de materia seca crop yield cultivos de primavera culture de printemps dry matter content feed crops genotipos genotypes hauteur height hordeum vulgare nurse crops plant population planta-abrigo plantas forrajeras plante d'abri proximate composition rendement des cultures rendimiento de cultivos spring crops trifolium variedades varieties