[Survey on field experiments 1998, B: Winter crops]

control de enfermedades crop yield cultivation cultivo cultivos de grano cultivos de invierno culture d'hiver danemark denmark dinamarca disease control ensayos de variedades field experimentation grain crops hordeum vulgare malezas mauvaise herbe pests of plants plagas de plantas pratique culturale ravageur des plantes rendement des cultures rendimiento de cultivos secale cereale triticosecale triticum aestivum variedades varieties variety trials weeds winter crops