Results of research in soil tillage in 1997

catch crops cereal crops compactage du sol conservation des sols crop yield cultivos de cereales cultivos intermedios cultural methods cycling estructura del suelo fertilisation fertilizer application field experimentation hortalizas (plantas) labranza leaching lessivage du sol malezas mauvaise herbe mode de culture pastizal sembrado prairie artificielle projet de recherche rendement des cultures rendimiento de cultivos research projects seedbed preparation soil compaction soil conservation soil structure solanum tuberosum sown pastures structure du sol suecia sweden tillage travail du sol vegetable crops weeding weeds