The aim of this present work was to study the behavior of castanha-do-brasil (Bertholletia excelsa) and cupiúba (Goupia glabra) and also set a growing function and an equation for estimating the crown diameter in an agroforestry system model, installed in Confiança Experimental Station, Cantá, Roraima, Brazil, in 1995. We measured quantitative data, such as diameter basal height, total height, crown insertion height, crown diameter and qualitative data like survival, bole quality and phytosanitary aspects such as disease or pests. We analyzed the silvicultural behavior and estimated equation at the crown diameter in function of DBH, and adjusted a growing function for the cupiuba and castanha-do-brasil. Of the 71 castanha-do-brasil trees analyzed 20 (27,8%) producing fruits. The cupiúba showed high individual percentage of bifurcation (around 87,5%). The statistical analyses indicated the Backman function as the best adjusted for the observed species; and based on the equations for estimating crown diameter in function of DBH, we could make inferences about the necessary vital space for reaching determinated dimension. Both species have silvicultural potential for restored areas in agroforestry systems or homogeneous plantations.
Bertholletia excelsa; goupia glabra; agroforestry system; Roraima
