Tratamentos pré-germinativos para a superação de dormência de sementes de Erythrina velutina Willd na região do cariri paraibano.

Abstract

The mulungu (Erythrina velutina Willd.) Is a characteristic tree species of the Brazilian Northeast Caatinga, being widely used in the recovery of degraded areas and in agroforestry systems. Due to the occurrence of integument dormancy of the seed the process of seedling formation of the species becomes somewhat difficult. Thus, this work aimed to evaluate the effect of different pregerminative treatments on the overcoming of dormancy in mulungu seeds. The experiment was conducted in the greenhouse under uncontrolled conditions (LAEB / CDSA / UFCG). The sowing occurred in plastic trays perforated in the bottom, using the substrate sand, to the depth of 1.0 cm. The experimental design was completely randomized with 4 treatments, 4 replicates and 25 seeds in each replicate, totaling 400 seeds. For this, the following pre-germinative treatments were studied: mechanical scarification (T1); mechanical scarification with imbibition (T2); Imbibition (T3); and control (T4), being evaluated the physiological quality. The effect of the treatments was evaluated by means of emergency and vigor tests (index of emergency speed - IVE), the count of emerged seeds was in a period of 21 days. According to the data obtained it was verified that the manual scarification of the tegument with sandpaper nº. 80 on the side opposite the micropyle with soaking for 24 hours was considered the most efficient treatment for overcoming seed dormancy.