CONCENTRAÇÕES DE ÁCIDO INDOLBUTÍRICO, COMPRIMENTO E ÉPOCA DE COLETA DE ESTACAS, NA PROPAGAÇÃO DE UMBUZEIRO

The spreading of umbuzeiro (Spondias tuberosa Arruda Câmara) occurs sexual and asexual forms, with little information about the propagation by cuttings. The aim of this paper was to evaluate the effects of concentrations of indole butyric acid (IBA), length and timing of collection of propagules in propagating of umbuzeiro. The experimental design was randomized blocks in factorial scheme 5 (IBA concentrations: 0, 1500, 3000, 4500, 6000 mg.L-1) x 2 (length of cuttings: 10 and 20 cm) x 2 (times of collection of cuttings: march and september) with three replications of twenty cuttings per experimental unit. The cuttings were immersed in IBA solution for the time of 10 seconds and placed in polyethylene bags containing substrate composed of sand, clay and vermicompost (3:1:1 v / v), which were packed and kept for 90 days under nursery, mesh that allowed the passage of 25% brightness. After this period the following variables were analyzed: percentage of rooted cuttings and shoots, number average root cuttings, and the mass of the fresh matter roots and shoots. The most rooting percentage was obtained in the stakes of umbuzeiro 20 cm inlength treated with IBA (6000 mg.L-1), planted in march. The smallest roots of umbuzeiro in September was probably because the plant was starting the process of flowering.