[Nitrogen uptake in winter rape during autumn]

absorption de substances nutritives automne autumn azote brassica napus cultivo intercalado cultivos de invierno cultivos de primavera culture d'hiver culture de printemps culture intercalaire danemark date de semis denmark dinamarca fecha de siembra fertilisation fertilizer application hordeum vulgare intercropping leaching lessivage du sol nitrate nitrates nitratos nitrogen nitrogen content nutrient uptake saison seasons sowing date spring crops teneur en azote winter crops