Ácido indolbutírico na miniestaquia de Libidibia ferrea (Mart. Ex Tul) L. P. Queiroz

Abstract

The pau-ferro, Libidibia ferrorea (Mart. Ex Tul.) L.P. Queiroz, a tree native to Brazil, is found in the Caatinga, the Cerrado and the Atlantic Forest. In the Northeast region it has several uses, from energy (firewood and charcoal), to construction, fences, forage and medicine. Its seeds present dormancy that must be broken by scarification if a germination above 50% is desired, justifying the use of the seedling production process by mini-cutting. Thus, the objective of this work evaluate the viability of vegetative propagation for species and to define a concentration of indolbutyric acid for future evaluations. The evaluations were carried out in the nursery of the forest science department of the Universidade Federal Rural de Pernambuco (UFRPE) in Recife, where a seminal clonal garden was set up to obtain the cuttings that would be tested for the influence of the use of indolbutyric acid (IBA) in the rooting of the species. The experiment was conducted for a period of 100 days in order to observe its development in 3 phases, house of vegetation (40 days), where the mortality of cuttings, presence of sprouting, vigor of sprouts and the presence of root at the bottom of the tubetes, house of shade (35 days), where the mortality of cuttings was evaluated, sprouting, vigor of the shoot, presence of root at the bottom of the tube, number of leaves and size of the shoot, and full sun (25 days), where the abscission of leaves, emission of leaves, presence and size of the shoots, formation of callus, number of roots, size of the largest root, volume of root and dry mass of the aerial part, the root and the most callus root were evaluated. After the end of the experiment and the evaluation of its trends and the derivation of its equations, it was concluded that Libidibia ferrea (Mart. Ex Tul.) L. P. Queiroz has enormous potential for vegetative propagation, where the average survival at the end of 100 days was almost 70% and that the dosage of 4000 mg L-1 of IBA is the most indicated to help in the rooting of its cuttings.