Investigation on the possibility of cultivation winter oilseed rape composite-hybrid varieties in Poland | Recherches sur la possibilite de culture de varietes de colza d'hiver CHL [composite hybrid lines] en Pologne

brassica napus crop yield cultivos de invierno culture d'hiver ensayos de variedades hybride hybrids oil crops plantas oleaginosas poland polinizadores pollinators pollinisateur pologne polonia rendement des cultures rendimiento de cultivos variedades varieties variety trials winter crops