Emergência e vigor de Handroanthus impetiginosus (Mart. ex DC.) Mattos em função de diferentes tempos de imersão em água.

Abstract

Emergence and vigor of Handroanthus impetiginosus (Mart. ex DC.) Mattos as a function of different water immersion times. This study aimed to verify the influence of different water immersion times on the emergence and vigor of seedlings of Handroanthus impetiginosus (Mart. ex DC.) Mattos. For this, seeds were subjected to 11 treatments, as follow: control (T1) and water immersion during 6, 12, 18, 24, 30, 36, 42, 48, 54 and 60 h (T2, T3, T4, T5, T6, T7, T8, T9, T10, and T11, respectively). Each treatment consisted of four replicates of 25 seeds. Thirty days after sowing, seedlings were evaluated as to diameter at ground level, root length, aerial part, fresh mass, and dry mass. The data were subjected to analysis of variance and the means were compared by the Tukey Test. In the control seedlings (T1), emergence occurred five days after sowing and in the other treatments, it started from the eighth day, resulting in the emergence of 88% and emergence speed index of 2.61. Seed soaking in water for up to 36 h resulted in more vigorous seedlings regarding the height, diameter, fresh mass, and dry mass, evidencing a pattern of productive quality in this species. Therefore, these data contribute to the optimization of seedling production of H. impetiginosus, assisting degraded area recovery programs and the conservation of this species.