Effect of Paclobutrazol Concentrations and Foliar Application Times on Flowering of ‘Mahachanok’ Mango
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Abstract
Paclobutrazol (PBZ) is a growth regulator that has been widely used to stimulate mango flowering by soil drenching. This study aimed to investigate the suitable concentration of PBZ and the number of application times that can induce flowering by foliar application. The experimental design was Completely Randomized Design (CRD) with 10 treatments and 4 replications. ‘Mahachanok’ mango trees were used in this study. They received two and three PBZ foliar applications, applied at 15 days after pruning (DAP) with 1,000 2,000, 3,000 and 4,000 mg/L and repeated with PBZ 2,000 mg/L for the second time and third time at 30 and 45 DAP comparing to 2,000 mg/L of PBZ at 30 DAP and non-PBZ application as the control treatment. The results showed that PBZ foliar application stimulated earlier flowering and a higher percentage of flowering shoots than the control. The earliest flowering was presented when they got 1,000 mg/L at 15 days and repeated at 30 days with 2,000 mg/L of PBZ, flowered within 106.5 DAP and 72.5 % of new shoots flowering. Moreover, the length of mango panicles with PBZ treatments was significantly shorter than that of the control treatment. PBZ doses and the number of application times caused phytotoxic symptoms in vegetative shoots and inflorescences. However, there were found phytotoxic symptoms of shoots and panicles on the PBZ treatments at the rate of 2,000 mg/L and above, at the first foliar application (15 DAP). The phytotoxic symptoms on shoots and panicles occurred after mango trees received foliar application at 15 and 90 days, respectively.
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