Controle do florescimento, desenvolvimento e qualidade de frutos do abacaxizeiro 'vitória' utilizando o paclobutrazol

• Ano de defesa: 2021
• Autor(a) principal: Silva, Laís Gertrudes Fontana
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Agricultura Tropical; Centro Universitário Norte do Espírito Santo; UFES; Programa de Pós-Graduação em Agricultura Tropical
• Palavras-chave em Português: Ananas comosus (L.) Merril; floração; reguladores de crescimento; manejo; subject.br-rjbn; Agronomia
• Link de acesso: http://repositorio.ufes.br/handle/10/14766

One of the main limitations that afflicts pineapple growers is the phenomenon of natural flowering. The use of compounds that act on the synthesis of hormones is an alternative for management. Thus, the objective was to evaluate the effect of the concentration of paclobutrazol (PBZ) and the period of application in the pineapple 'Vitória'. The design was in randomized blocks in a factorial scheme (3x3+1), with three concentrations (75, 150 and 300 mg L-1 ) of PBZ and three periods (P1: April-May, P2: May-June and P3: June-July) and an additional treatment (control). Flowering calculation, plant development analysis, photosynthetic pigments, carbohydrate allocation, total nitrogen and fruit physicochemical analysis were performed and the data were submitted to analysis of variance and Tukey test (p<0.05). All PBZ concentrations inhibited flowering and there was an increase in inhibition time. The PBZ at the concentration of 150 and 300 mg L-1 inhibited the natural flowering in P1 and P2 and 80% in P3. The PBZ induced the development of leaves in relation to the control, however the effect reduced when increasing the concentration. Chlorophyll contents were higher with 150 and 300 mg L-1 of PBZ and were not influenced by the periods. For the carbohydrate contents, the starch showed a significant difference. Nitrogen was influenced in the apical and median part of the leaves. The PBZ reduced the fruit mass, and consequently increased the content of Brix, vitamin C and ratio. Therefore, a concentration of 75 mg L-1 is recommended in the period from May to June.