Enraizamento de estacas de Ginkgo biloba tratadas com ácido indolbutírico e ácido bórico

Abstract

The aim of the work was to study the effect of indolbutyric (IBA) and boric (B) acids to root Ginkgo biloba cuttings. At the base of cuttings, with two leaves and 15 cm of length, were made two lesions with 2 cm to expose the cambium. Cuttings were treated for a period of 10 seconds with four concentrations of IBA (0, 1000, 2000 and 3000 mg L-1) combined with two concentration of B (0 and 150 mg L-1). After that, cuttings were taken in polypropylene trays filled with washed sand. The experimental design was of randomized blocks in the factorial arrangement (4x2), with six replications. After 70 days, evaluations were done considering rooted, non-rooted, and dead cuttings, diameter and length of the roots. The data were submitted to ANOVA and previously tested for normality by the Shapiro-Wilk Test. Rooting with IBA at 2000 mg L-1 (80,55%) was better than IBA at zero mg L-1 (55,56%), not differing from the other treatments. Boric acid (B) at 150 µg mL-1 didn't increase rooting rate, and dead cuttings. There was no interaction between IBA and B concentrations. No effect of IBA or B in the diameter and the length of roots was observed.