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Ciência Rural

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YAMAMOTO, Lilian Yukari et al. Cutting rooting of Psidium guajava L. 'Século XXI' guava treated with indolebutyric acid with talc and alcohol as a vehicle. Cienc. Rural [online]. 2010, vol.40, n.5, pp.1037-1042. ISSN 0103-8478.

In commercial production of Psidium guajava L. (guava) seedlings quality is of paramount importance in order to ensure uniformity, rapid formation, high productivity and early production, making it essential to vegetative propagation. The aim of this research was to evaluate the cutting rooting of Psidium guajava L. 'Século XXI' treated with different concentrations of indolebutyric acid (IBA) with talc and alcohol as a vehicle. Herbaceous cuttings with 10-12cm were submitted to two forms of applications (alcoholic talc and alcoholic solution) and three doses (0; 1000 and 2000mg L-1) of IBA. The cuttings were placed in plastic boxes containing carbonized rice husk. The experimental design was complete randomized, two-way ANOVA (2x3) with five replicates of ten cuttings. After 95 days, the following variables were evaluated: cutting survival rate (%); foliar retention (%); rooted cuttings (%); root number per cutting; root length per cutting and dry root matter per cutting (g). The best results for the percentage of rooting (28.5%), number of roots per cutting (12.10) and root length (6.79cm) were obtained with the highest concentration of IBA. The results showed that the application of 2000mg L-1 of AIB is the most appropriate to provide the best rooting characteristics of 'Século XXI' guava and the use of talc as an vehicle is more efficient than alcohol.

Keywords : propagation; rooting; growth regulators; IBA.

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