[Establishing cereal crops by new (siplified) methods]

avena sativa conservation des sols cubrimiento del suelo cultivation equipment cultivos de invierno cultivos de primavera culture d'hiver culture de printemps establecimiento de plantas helianthus annuus hordeum vulgare land management maquinaria de cultivo minimum tillage mulching paillage plant establishment seed drills semoir soil conservation spring crops travail du sol minimal triticum aestivum winter crops zea mays