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Universidade Estadual Paulista (2008)

Manejo da floração de mangueiras no Semi-árido do nordeste brasileiro com inibidores da síntese de giberelinas

Mouco, Maria Aparecida do Carmo

Titre : Manejo da floração de mangueiras no Semi-árido do nordeste brasileiro com inibidores da síntese de giberelinas

Auteur : Mouco, Maria Aparecida do Carmo

Université de soutenance : Universidade Estadual Paulista

Grade : Doutorado 2008

Résumé
The mango crop within the semi-arid region stands out in the national scenario due to the expansion of the planted area, the production quantity, high yields and quality of the fruit produced, as well as to the possibility of all-year production due to climatic conditions and technologies that allow the management of plant growth and blossom, through irrigation, pruning and use of plant growth regulators. Paclobutrazol applied to the soil is used for the production management of mango in most of the orchards. However, it is necessary to identify other vegetal regulators that might be efficient for the production management of different cultivars and might be applied to the leaves, so as to minimize the risk of residues in the soil and inadequate application quantities over several years. Therefore, the present paper has the purpose to evaluate the effect of plant growth regulators that can be applied to the leaves, regarding their efficiency for the blossom management of the cultivars Tommy Atkins and Kent, allowing off season mango production with higher precision in dosage recommendation and lesser contamination risk for the plant and the soil. The experiments were carried out in the area of the São Francisco river valley, under green-house conditions at Embrapa Semi-Àrido, and under field conditions on the farms Frutavi and Andorinhas, both located in the municipality of Petrolina, Pernambuco state, from October 2005 to July 2008. Three plant growth regulators, sprayed to the leaves, were evaluated : prohexadione-Ca, trinexapac-ethyl and chlomequat cloride, applied in two dosages, and compared to paclobutrazol applied to the soil, using a randomized blocks design, with four replications and two plants per plot. In order to compare the effects of the treatment, data were recorded related to vegetative growth (percentage and length of the shoots), ...(Complete abstract, click electronic access below)

Mots clés  : Giberelina. ; Floração. ; Reguladores de crescimento. ; Hormonios vegetais. ; Paclobutrazol ; Trinexapac-ethyl ; Prohexadione-Ca ; Chormequat cloride

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