[Field trials in the Agricultural Associations 1997: Tables of national investigations]

agriculture biologique beta vulgaris chaulage control de enfermedades control de plagas cultivation cultivo cultivos de invierno cultivos de primavera cultivos de semillas culture d'hiver culture de printemps danemark denmark dinamarca disease control encalado escarda feed crops fertilisation fertilizer application field experimentation industrial crops legumes leguminosas liming lutte antiravageur organic agriculture papa pest control plant protection plantas forrajeras plantas industriales plante industrielle pomme de terre porte graines potatoes pratique culturale protection des plantes seed crops solanum tuberosum spring crops weed control winter crops