This study aimedto evaluate the dynamics of the association of 'capim-de-raiz' (Chloris orthonotonDoell) and alexandergrass [Brachiaria plantaginea (Link) Hitchc],as for persistence and production. Gathering of botanical material, evaluationof botanical composition and forage mass were realized in deferred native pastures.To estimate forage mass, a randomized block design with four treatments wasused, consisting of 60, 90, 120 and 150 days of deferring and five replications.The botanical composition was expressed as a percentage of the total. Tenfamilies, 15 genera, and 18 species were identified. In the botanical compositionfrom May to August 2007, alexandergrass was the main component from 60 to 90days, corresponding to 46.75 and 52.09%, respectively. In August2007, other species participated with 57.75% of the botanical composition. Inthe assessment of the year 2008, at the end of the deferring period, other speciesoccupied 100% of the botanical composition of pasture. The highestforage mass (kg DM/ha) for alexandergrass (2,736) occurred at 90 days; for otherspecies (3,141) and 'capim-de-raiz' (2,701), it was at 120 days. Theuse of stockpiled forage should preferably take place after 60 to 90 days ofdeferring. After a year without interference, 'capim-de-raiz' and alexandergrassdecrease participation in the botanical composition of pasture.
