[Survey 1997, K: Forage production]

azote beta vulgaris control de plagas crop yield danemark denmark dinamarca ensilado ensilage (produit) escarda field experimentation gramineas graminee grasses herbicidas herbicide herbicides hordeum vulgare lutte antiravageur nitrogen pest control rendement des cultures rendimiento de cultivos secale cereale silage transgenic plants trifolium triticum variedades varieties weed control zea mays