The biomass production and pasture structure of Andropogon grass were evaluated at 35, 49, and 63 days of regrowth, in three silvopastoral environments: under Pau-d'Arco and Jatobá trees, in open field and in monoculture system. The experiment was designed in split plot with five replications, the plots were the environments and the split plots were the regrowth ages. The luminosities under Pau-d'Arco, Jatobá, and open field were: 74, 62, and 82 %, respectively, relative to the areas under full sun. There was interaction among environments and ages of regrowth. The shading under the canopy of Pau-d'Arco and Jatobá did not affect the production of dry matter of Andropogon grass; however, reduced the height of the grass at 63 days of regrowth. The percentage of leaves of forage at 35 days of regrowth was higher in monoculture. At other ages of regrowth, the four environments did not differ among themselves.
natural shade; Andropogon gaynus Kunth; Tabebuia serratifolia Vahl; Hymeneae courbaril L
