Crescimento e acúmulo de massa seca em plantas de jurema preta (Mimosa tenuiflora (Wild.) poiret) em função do sombreamento.

Abstract

This study aimed to evaluate the initial growth of Mimosa tenuiflora (Willd.) Poiret under shading. The experiment was carried out in the forest of the Federal University of Campina Grande, Patos, Paraiba, Brazil, from November 2017 to April 2018. Three treatments were evaluated, consisting of different levels of shading (50% and 70%) and full sun. The experimental design was the completely randomized (DIC), with three replicates of five plants. It were evaluated height plants; stem diameter; absolute growth rate (TCA); weight of dry matter of roots, stems, leaves, shoot, shoot/root ratio and total dry matter; height/diameter ratio (RAD) and Dickson Quality Index (IQD). The growth of M. tenuiflora under 50% shading and full sun provided higher height and absolute growth rate of the seedlings. The shading allowed less accumulation of dry mass of leaves, stem, shoot and total dry mass of the plants. Full-sun cultivation provided better quality seedlings, confirming the observation that this is a pioneer species, and shading is not recommended during the nursery phase.