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In Nayarit, the climactic conditions during the last five years have caused heterogeneous phenological behavior in ‘Manila’ mango. This situation has induced a high reduction in yield and low fruit quality. The objective of this study was to determine the effect of paclobutrazol (PBZ) and potassium nitrate (KNO3) on flowering, harvest time, yield and fruit quality of ‘Manila’ mango. The study was done during 20082009 and 2009-2010 in a ten-year-old ‘Manila’ orchard. Dosages of PBZ (0, 10, and 20 ml/tree) and KNO3 (0 and 4 %) were tested. In every treatment, physiological and reproductive aspects were evaluated. During the first cycle (2008-2009), the PBZ treated trees reached 70 and 90 % flowering, while the control trees had only 50 % flowering. During the second cycle (2009-2010), the start of flowering was 23 days earlier in PBZ + KNO3, while the PBZ treatment alone advanced flowering 15 days compared with the control trees. The PBZ treated trees had a flowering percent between 94 and 98, whereas the control trees had only 64.4 % flowering. Results showed that PBZ ensured abundant and advanced flowering in ‘Manila’ mango. In addition, in both cycles PBZ increased the yield more than twice when compared to control trees. ADDITIONAL

PACLOBUTRAZOL ENSURES ABUNDANT AND ADVANCED FLOWERING IN 'MANILA' MANGO, EVEN WITHOUT ENVIRONMENTAL CONDITIONS