Manejo da indução floral da mangueira 'Palmer' com uso de paclobutrazol e uniconazole

Abstract

The use of floral induction technique in mango trees by means of growth regulators allows producers to obtain excellent quality fruit at any time of year in the Brazilian semiarid region, thereby allowing the production scheduling to time of lower product supply. The objective of this study was to evaluate the effectiveness of different doses of paclobutrazol and uniconazole in 'Palmer' mango in the vegetative growth cessation, flower induction, and the vegetative and reproductive characteristics, during the offseason in the semiarid region of the state of Minas Gerais. The experiments were designed in randomized blocks, and in the first experiment evaluated the effects of paclobutrazol at doses 0.0; 0.25; 0.50; 0.75; 1.0 and 1.25 g of active ingredient per linear meter of canopy, while in the second experiment, the uniconazole was tested at doses 0.0; 1.0; 2.0; 3,0 and 4,0 g of active ingredient per plant. Inhibition of gibberellin synthesis triggered by paclobutrazol and the uniconazole was effective in promoting the reduction of the vegetative growth of 'Palmer' mango, enabling the anticipation of plant flowering and consequently the differentiation of vegetative buds in flower bud, favoring flowering and the fruit production. In both experiments, the higher concentrations of both growth regulators the higher percentage of flowering branches, number of fruits retained in plants and fruit yield.