Evaluation of heading cabbage varieties for organic cultivation: criteria of variety choice, experimental method and effect of cultivation system

agricultura tradicional agriculture biologique agriculture traditionnelle brassica oleracea clima climat climate crop yield danemark delia radicum denmark dinamarca ensayos de variedades fertilisation fertilizer application field experimentation hortalizas (plantas) insecte nuisible lepidoptera noruega norway organic agriculture pest insects rendement des cultures rendimiento de cultivos thrips thrips (genre) thrips (genus) traditional farming variedades varieties variety trials vegetable crops