Fatores que interferem na germinação das espécies de: Mulungu (Erythrina velutina), Craibeira (Tabebuia aurea) e Barriguda (Ceiba glaziovii).

Abstract

Due to the semi-arid climate of the caatinga, its vegetation and fauna undergo some adaptations, such as the loss of leaves during the dry season to avoid the loss of water, the presence of compound and mobile leaves and because it is a region with little rainfall, the species existing in this region are adapted to temperatures high levels and lack of water for long periods of time. The numbness in seeds is a universal phenomenon that is directly linked to their morphology, some species present dormancy in their integument, making it necessary evaluate the type of seed and see which pre-germination method to use for overcoming dormancy. The present work aimed to evaluate the factors that influence the germination of Mulungu (Erythrina velutina) seeds, Craibeira (Tabebuia aurea) and Barriguda (Ceiba glaziovii) to evaluate the influence of substrates in the development of species. Seeds from three tree species from the caatinga: Barriguda (Ceiba glaziovii Kuntze), Mulungu (Erythrina velutina) and Craibeira (Tabebuia aurea). The treatments used were: sandy soil (T0 control); sandy soil composed (T1) and compost (T2), all in triplicates. The results showed that the control using sandy soil and T1 positively influenced the germination of the Barriguda species, presenting a total of 16 seeds germinated, 9 for the T0 control and 7 for the treatment 1(Ceiba glaziovii Kuntze). Differing with the results obtained by the other two species analyzed, Mulungu (Erythrina velutina) presented the result of 2 germinated seeds for treatment 1 and Craibeira (Tabebuia aurea) obtained a total of 4 seeds germinated, 2 in the T0 treatment (control) and 2 for T2. A low germination rate found in this experiment may have been influenced due to excess water, in the case of the mulungu species, it presents dormancy Therefore, mechanical scarification can be used as a pre-germination method for seeds of the barriguda species present difficulties in their germination, the seeds of the craibeira species tend to germinate with easier, but in this work both species showed results undesirable in relation to germination, which may have occurred due to factors external and internal.