[Survey on field experiments 1998, E: Seed crops and industrial crops]

brassica napus chanvre cultivos de invierno cultivos de primavera cultivos de semillas culture d'hiver culture de printemps danemark denmark dinamarca escarda field experimentation fuel crops gramineas graminee grasses hemp industrial crops linum usitatissimum malezas mauvaise herbe pests of plants plagas de plantas plant protection plantas industriales plante industrielle porte graines protection des plantes ravageur des plantes salix seed crops spring crops trifolium repens variedades varieties weed control weeds winter crops