Ácido indolbutírico no enraizamento de estacas de oliveira coletadas em diferentes épocas

Abstract

Cutting is a propagation method widely used in fruit trees. Its viability depends on the ability of each species to form adventitious roots, however, it is necessary to study the different characteristics of this process. The present work aimed to evaluate the propagative response of olive cuttings collected at different times of the year, under treatments with different concentrations of indolebutyric acid (IBA) within each season standardized to coincide with the four seasons of the year. The cultivars used were 'Arbequina', 'Coratina' and 'Picual' and the AIB concentrations were 0 mg.L- 1, 1,000 mg.L-1, 2,000 mg.L-1, 3,000 mg.L-1. Branches were collected from the middle portion of the parent plants located in the experimental field of Palma, in the municipality of Capão do Leão-RS, and cuttings with approximately 12 cm in length were prepared, keeping four leaves in the apical region. The design used was completely randomized, in a 3 x 4 x 4 x 4 factorial scheme (three cultivars, four seasons, four concentrations of IBA with four replications) using 12 sampling units. The experiment was carried out in a greenhouse and the evaluations were carried out 120 days after the cutting of each collection period. It was observed in the conditions of the present work that there is variation between the times of collection and the treatments of IBA in the olive tree cuttings. Treatments corresponding to the collections carried out, regardless of the cultivar, winter and autumn had the best survival and rooting rates. Regarding the treatment of AIB, it was observed that the concentration of 2,000 mg.L-1 was sufficient to promote survival and rooting.