Effects of cattle slurry on the growth potential and clover proportion of organically managed grass-clover leys

agriculture biologique botanical composition bovin cattle composition botanique crecimiento croissance festuca pratensis ganado bovino grasslands growth herbage hordeum vulgare liquid manures lisier lolium perenne modele modelos models noruega norway organic agriculture phleum pratense pisum sativum praderas purin slurry trifolium hybridum trifolium pratense trifolium repens vicia sativa