Efeito do paclobutrazol e de ácido giberélico na indução floral do maracujazeiro-amarelo em condições de entressafra
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Data
2006-08-01
Autores
Ataíde, Elma Machado [UNESP]
Ruggiero, Carlos [UNESP]
Oliveira, João Carlos de [UNESP]
Rodrigues, João Domingos [UNESP]
Oliveira, Hércules José de
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Sociedade Brasileira de Fruticultura
Resumo
Objetivou-se estudar os efeitos de ácido giberélico (GA3) (i.a.), nas concentrações de 50 e 100 mg L-1, acrescido do espalhante adesivo Extravon® a 0,05%, em duas aplicações via foliar e do paclobutrazol (PBZ) (i.a.), em doses de 2 e 4 g por planta, aplicado via solo, em uma única aplicação, na antecipação da floração do maracujazeiro-amarelo, em Araguari-MG. O delineamento experimental empregado foi em parcelas subdivididas, com cinco tratamentos (parcelas) e dois tratamentos (subparcelas), com quatro repetições e quatro plantas por parcela. Foram identificados 12 ramos terciários por parcela, com seis ramos expostos à luminosidade predominante pela manhã e seis com luminosidade predominante à tarde. Avaliaram-se os dois lados da espaldeira aos 103 dias após a primeira aplicação dos tratamentos, observando-se o comprimento dos ramos e de entrenós, número de nós e de botões florais. Os reguladores não promoveram respostas significativas para o comprimento dos entrenós e o número de botões florais. Porém, observaram-se indícios de maior número de botões florais com PBZ 2 g. O maior comprimento dos ramos foi obtido com GA3 100 mg L-1, sob luminosidade, pela manhã. Ao se compararem os tratamentos nas duas condições de luminosidade, o PBZ 4 g, independentemente da condição de luminosidade, proporcionou o menor comprimento dos ramos.
The present study objective was to evaluate gibberellic acid (GA3) (a.i.), in the concentrations of 50 and 100 mg L-1, increased by the ExtravonTM (0.05%) adhesive spreader in two leaf applications, and the use of paclobutrazol (PBZ) (a.i.), with dosages of 2 and 4 g per plant, and a single application on the soil at yellow passion-fruit flowering anticipation in Araguari-MG. The experimental design was in split-plots with five treatments (plots) and two treatments (subplots), with four repetitions and four plants per plot. Twelve tertiary branches were identified per plot, with six branches exposed to predominantly morning brightness and six exposed to predominantly evening brightness. Both sides were evaluated at 103 days after the first treatment application, whereas the length of the branches and the internodes, number of nodes and number of floral buds were observed. The regulators did not promote significant responses for internodes length and floral buds number. However, an indication of a greate number of flower buds was observed with 2 g of PBZ. The larger length of branches was obtained with 100 mg L-1 of GA3 and under the morning brightness. Comparing the treatments from both brightness conditions, 4 g of PBZ offered the smallest branch size independently of the luminosity condition.
The present study objective was to evaluate gibberellic acid (GA3) (a.i.), in the concentrations of 50 and 100 mg L-1, increased by the ExtravonTM (0.05%) adhesive spreader in two leaf applications, and the use of paclobutrazol (PBZ) (a.i.), with dosages of 2 and 4 g per plant, and a single application on the soil at yellow passion-fruit flowering anticipation in Araguari-MG. The experimental design was in split-plots with five treatments (plots) and two treatments (subplots), with four repetitions and four plants per plot. Twelve tertiary branches were identified per plot, with six branches exposed to predominantly morning brightness and six exposed to predominantly evening brightness. Both sides were evaluated at 103 days after the first treatment application, whereas the length of the branches and the internodes, number of nodes and number of floral buds were observed. The regulators did not promote significant responses for internodes length and floral buds number. However, an indication of a greate number of flower buds was observed with 2 g of PBZ. The larger length of branches was obtained with 100 mg L-1 of GA3 and under the morning brightness. Comparing the treatments from both brightness conditions, 4 g of PBZ offered the smallest branch size independently of the luminosity condition.
Descrição
Palavras-chave
Passiflora edulis f. flavicarpa, plant regulator, flowering, Passiflora edulis f. flavicarpa, Regulador vegetal, Floração
Como citar
Revista Brasileira de Fruticultura. Sociedade Brasileira de Fruticultura, v. 28, n. 2, p. 160-163, 2006.