Métodos para superação de dormência de sementes de jatobá (Hymenaea courbaril L.)

Abstract

The aim of this study was to evaluate the influence of dormancy overcoming methods on the germination of jatobá (Hymenaea courbaril L.) seeds. The experimental design was completely randomized, with four replications of twenty five plants in the plot. The dormancy overcoming methods were: no scarified seeds (M1); scarified on the side of the embryonic axis with sandpaper n° 80 (M2); scarified on the side opposite the embryonic axis with sandpaper n° 80 (M3) and scarified in water at 90ºC for two minutes (M4). The characteristics evaluated were: percentage of emergency (E%) and average time of emergency (TM). The seeds that were submitted to the methods of mechanical scarification with sandpaper n° 80, both on the side of the embryonic axis (M2) and on the side opposite to the embryonic axis (M3), presented the highest emergence rates (84 and 76%), respectively, in relation to other methods. The mean emergence time (TM) was 20 and 25 days, respectively, only longer than that of seedlings whose seeds were not scarified (M1).