[Productivity and persistence of associated pastures under grazing in a Yurimaguas ultisol]

andropogon gayanus botanical composition brachiaria decumbens brachiaria humidicola centrosema centrosema pubescens composition botanique desmodium ovalifolium feed grasses feed legumes gain de poids ganancia de peso grassland soils grasslands grazing herbage humid tropics leguminosas forrajeras pastoreo peru praderas sol d'herbages stylosanthes guianensis suelo de praderas tropiques humides ultisoles weight gain