Superação de dormência de sementes e desenvolvimento de plântulas de Tamboril (Enterolobium contortisiliquum) em diferentes substratos

Abstract

This work aimed to evaluate methods for overcoming seed dormancy and seedling development of E. contortisiliquum in different substrates. The experimental design used was completely randomized. The methods used to overcome dormancy were: non-scarified seeds (M1); seeds scarified on the side of the embryonic axis with sandpaper (M2); seeds scarified on the opposite side of the embryonic axis with sandpaper (M3); seeds scarified in water at 80ºC for 2 minutes (M4); scarified seeds in water at 80ºC for 1 minute (M5). The characteristics that were evaluated were: percentage of emergence (E%) and the average time of emergence (TM). For seedling development, a completely randomized design was used with four replications of five plants in the plot. The substrates were: Sand (S1); Soil (S2); Sand + Bovine manure 3:1 v/v (3) and Soil + Bovine manure 3:1 v/v (S4). The characteristics evaluated in the work were: number of sheets (NF); collector diameter (DC); shoot length (CPA); longest root length (CR), shoot dry matter (MSA) and root dry matter (MSR). The method of mechanical scarification performed with sandpaper on the side of the embryonic axis of the seed and the one in which the seeds were immersed in water at 80 ºC for 2 minutes resulted in higher means of emergence in less time. Substrates S3 and S4 that contained bovine manure in their constitution provided the highest averages in the development of E. contortisiliquum seedlings.