Improving the world s grasslands

agricultura agriculture browse plants burning chemical control conduite des herbages conservation de l'eau crecimiento croissance ensemencement escarda especies feed crops feeds fertilisation fertilizer application gramineas graminee grasses grassland management grasslands grazing growth haymaking herbage land use livestock management lutte chimique manejo de praderas manejo del ganado monde mundo national planning parcours pastizales pastoreo pastures pedogenese plantas forrajeras praderas productividad productivity quema rangelands siembra silage site preparation soil genesis sowing species supplementary feeding tierras de pastos trees utilisation des terres water conservation weed control world