Dry-matter yield and herbage quality of a perennial ryegrass/white clover sward in a rotational grazing and cutting system

abonos abonos nitrogenados application rates arcilla argile clay clay soils corte cutting dose d'application engrais fertilizers grasslands grazing herbage lolium lolium perenne netherlands nitrogen fertilizers organic matter pastoreo praderas seasonal variation soil sol sol argileux suelo suelo arcilloso trifolium trifolium repens