Influence of First Thinning in Morphometry of Tectona grandis L.f. on Roraima

ABSTRACT The aim of this study was to evaluate the effect of first thinning on the morphometry of trees in a forest plantation of Tectona grandis Lf (teak). The experimental design used was randomized block with four treatments and three replications were: T1 = control treatment (no thinning), T2, T3 end T4 with the removal of basal area the 20, 30 and 40% respectively. The evaluated morphometric variables were: crown proportion (PC), coverage index (AI), slenderness degree (GE), salience index (IS), crown form (FC) and crown length (CC). The application of thinning in teak, significantly influenced in all morphometric variables analyzed, except for the proportion of room (PC) and the projection index (SI). The thinning intensities (20%, 30% and 40%) presented no significant differences for variables: commercial bole height (HF), crown length (CL), crown diameter (DC), crown proportion (PC) and crown form (FC) of teak to the fourth post-thinning year.