Red clover in mixture with grass. Effects of different N-rates and harvest times on the yield and content of clover

calcio calcium contenido de materia seca cosecha crop yield crude fibre digestibility dry matter content fertilizantes nitrogenados festuca pratensis fibra bruta fibre brute fosforo harvesting lolium perenne magnesio magnesium mezcla de semillas nitrogen fertilizers phleum pratense phosphore phosphorus potasio potassium rendement des cultures rendimiento de cultivos seed mixtures trifolium pratense