Cutting rooting of Psidium guajava L. 'Seculo XXI' guava treated with indolebutyric acid with talc and alcohol as a vehicle/Enraizamento de estacas de Psidium guajava L. 'Seculo XXI' tratadas com acido indolbutirico veiculado em talco e alcool

• Published in: Ciência rural 2010-05, Vol.40 (5), p.1037
• Main Authors: Yamamoto, Lilian Yukari, de Sa Borges, Rogerio, Sorace, Mauren, Rachid, Breno Francovig, Ruas, Joao Miguel Francisco, Sato, Osvaldo, de Assis, Adriane Marinho, Roberto, Sergio Ruffo
• Format: Article
• Language: Spanish
• Subjects: Growth regulators
• 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. 'Seculo XIXI' 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.sup.-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.sup.-1] of AIB is the most appropriate to provide the best rooting characteristics of 'Seculo XIXI' guava and the use of talc as an vehicle is more efficient than alcohol. Key words: propagation, rooting, growth regulators, IBA. Na producao comercial de Psidium guaja-va L. (goiabeira), a qualidade das mudas e de fundamental importancia, a fim de garantir a homogeneidade, a rapida formacao, a alta produtividade e o inicio precoce da producao, tornando-se imprescindivel a utilizacao da propagacao assexuada. O objetivo deste trabalho foi avaliar o enraizamento de estacas de Psidium guajava L. 'Seculo XXI' tratadas com diferentes concentracoes de acido indolbutirico (AIB) veiculados em talco e alcool. Foram utilizadas estacas herbaceas de 10-12cm, submetidas a duas formas de aplicacao (solucao hidroalcoolica e talco) e tres concentracoes (0; 1000 e 2000mg [L.sup.-1]) de AIB. As estacas foram enraizadas em caixas plasticas contendo casca de arroz carbonizada. O delineamento experimental foi o inteiramente casualizado, com cinco repeticoes, em um fatorial 2x3, sendo cinco repeticoes de 10 estacas. Apos 95 dias, foram avaliadas as variaveis: sobrevivencia das estacas (%); retencao foliar (%); estacas enraizadas (%); numero de raizes por estaca; comprimento de raiz