[SP report, 17: Plant production in three organic farmed cattle farms]

agriculture biologique avena sativa cereal crops crop yield cultivos de cereales cultivos de primavera culture de printemps danemark denmark dinamarca feed grasses hordeum malezas mauvaise herbe medicago sativa organic farming pisum rendement des cultures rendimiento de cultivos secale cereale solanum tuberosum spring crops trifolium triticum weeds