This study was aimed to investigate the effect of Uniconazole (UCZ), as a replacement for Paclobutrazol (PBZ), on flowering of ‘Dai Loan’ mango, and to determine suitable UCZ dosages and the periods for bud break. Experiments were conducted on 7-year-old trees arranged in completely randomized design with two factors, i.e. dosages of bud initiation agents, and periods for bud break. For the former factor, the three dosages of UCZ included 1, 1.5 and 2.0 g a.i. m-1 canopy diameter, and a positive control (PBZ at 1.5 g a.i. m-1 canopy diameter). The second factor comprised three periods for bud break after bud initiation applications, viz. 45, 60, and 75 days (DABIT). All treatments were repeated six times, each of which equalled to one tree. Results suggested that UCZ can definitely replace PBZ in regard to its effects on the flowering. Flowering ratio reached to the highest, 85.5 – 90.0% when UCZ was applied at 1.5 – 2.0 g a.i. m-1 canopy diameter, and subsequently followed by bud break treatment with KNO3 2.5% at 75 DABIT. In addition, inflorescence length was not different between PBZ and UCZ dosages, while UCZ 1.5 and 2.0 g a.i. treatment brought about higher number of hermaphrodite flowers per inflorescence. Furthermore, application of either PBZ or UCZ at 1.5 g a.i. m-1 canopy diameter combined with bud breaking treatment at 75 DABIT, resulted in the highest yield, i.e. 40.8 and 50.3 kg/tree, respectively. As for the characteristics and quality of fruit, neither the two investigated factors caused significant impact.
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Hâu et al. (2018) studied this question.
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