The agronomic performance of seven forage grasses, under a mature rubber
plantation, was assessed in a cutting trial carried out at Porto Velho, Rondônia. During
the rainy season, the higher dry matter yields were obtained with B. brizantha, P.
atratum BRA-9610 and B. humidicola. During the dry season, the grasses more
productive were B. brizantha and P. atratum BRA-9610. In both seasons, magnesium
and potassium contents did not vary among grasses. During the rainy season, the higher
nitrogen and phosphorus contents were obtained with P. regnelli BRA-0159 and, P.
guenoarum BRA-3824 and B. humidicola, respectively, while P. atratum BRA-9610
and B. humidicola provided higher contents of calcium. During the dry season, P.
regnelli BRA-0159 showed the highest nitrogen content, while B. humidicola and B.
brizantha gave the highest phosphorus and calcium contents. In order to obtain greater
forage yields with better quality, the grasses more promising for pasture establishment
in a silvipastoral systems were B. brizantha, B. humidicola and P. atratum BRA-9610.