Influence of catch crops and ploughing times on nitrogen mineralization and nitrogen uptake

abonos nitrogenados absorption de substances nutritives aradura azote catch cropping cereal crops choix de la date crop yield cultivo intermedio cultivos de cereales cultivos de primavera culture de printemps feed grasses feed legumes hordeum vulgare labour leguminosas forrajeras lolium mineralisation mineralization nitrogen nitrogen fertilizers nutrient uptake ploughing rendement des cultures rendimiento de cultivos spring crops suecia sweden timing trifolium pratense trifolium repens