Timing of the spring application of cattle slurry to grassland

azote bovin calcio calcium cattle chemical composition choix de la date composition chimique contenido de materia seca contenido mineral crop yield dry matter content farmyard manure fertilisation fertilizer application fosforo fumier ganado bovino grasslands herbage lisier mineral content nitrogen noruega norway nutrition des plantes phosphore phosphorus plant nutrition potasio potassium praderas primavera printemps rendement des cultures rendimiento de cultivos slurry spring timing