Superação de dormência de sementes e análise de diferentes substratos no desenvolvimento de mudas de Dipteryx Alata VOG

Abstract

Baru (Dipterix alata Vogel), is a tree species belonging to the Fabaceae family, native to the Savana, used in the recovery of degraded areas and for both human and animal food. However, the seeds of this species have dormancy, the which results in a delay of germination. The aim of this study was to evaluate the influence of dormancy overcoming methods on the germination and development of D. alata seedlings on different substrates. The experimental design used to overcome seed dormancy was completely randomized, with four replications of twenty-five plants in the plot. The dormancy overcoming methods used were: seed without scarification (M1); scarified seeds on the side of the embryonic axis, with sandpaper (M2) and scarified seeds on the side opposite to the embryonic axis, with sandpaper (M3). The experimental design used in the seedling development was completely randomized, in a 3 x 2 factorial scheme (three types of substrates and two environments) with five replications of five plants in the plot. The substrates were: coarse sand (S1); soil + bovine manure 3: 1v / v (S2) and soil + fine sand 2: 1 v / v (S3). The environments were: 50% and 100% light. The characteristics evaluated were: shoot length (CPA); length of the largest root (CR); diameter (DC); number of leaves (NF); shoot dry matter (MSPA) and roots (MSR) and the relationship between shoot dry matter and roots (MSPA / MSR). D. alata seeds have an emergence of up to 98% in the mean time of 17.9 days. D. alata seedlings can be produced with quality, on substrates that contain the soil and cattle manure in the proportion of 3:1 v/v.