Emergência e vigor de Tabebuia aurea (Silva Manso) Benth. & Hook.f. ex S.Moore em função de diferentes tempos de imersão em água.

Abstract

Considering the strategies to recover degraded areas and the need for studies related to plant production technology, this study aimed toa ssess the in昀氀uence of different times ofw ater immersion ont he emergence and vigor of seedlings of Tabebuia aurea (Silva Manso) Benth. & Hook.f. ex S.Moore. For this, seeds were subjected to 11 treatments: control (T1) and water immersion for 6, 12, 18, 24, 30, 36, 42, 48, 54, and 60 hours (T2, T3, T4, T5, T6, T7, T8, T9, T10, and T11, respectively). Four replicates of 25 seeds were used in each treatment. Thirty days after sowing, seedling length, diameter, fresh mass, and dry mass were analyzed. The data were subjected to analysis of variance and the means were compared by the Tukey test. Seedlings subjected to 60 h (T11) and 42 h (T8) of immersion started to emerge on the fourth and 昀椀fth days after planting, respectively. However, there was no signi昀椀cant effect of the treatments on emergence (%) and emergence speed index (ESI), at 30 days after sowing. The highest mean length (18.5 cm) was recorded for seedlings subjected to 48 h of immersion (T9). Regarding the diameter, immersion for 6 h (T2) provided the highest value (2.34 mm), followed by the control (T1) (2.28 mm). The highest mean of fresh mass (1.2786 g) was observed in seedlings submerged for 36 h (T7). Immersions for 48 h (T9) and 42 h (T8) resulted in higher values of dry mass (0.3678 and 0.3675 g, respectively). Therefore, it was observed that the periods of immersion of T. aurea seeds in water produced more vigorous seedlings with respect to the parameters of seedling length, diameter, fresh weight and dry weight. There was no signi昀椀cant effect of the treatments used for percentage of Emergency and ESI at the end of the experiment.