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Use of Trunk Injection Technique and Alternative Compounds in Promoting Flowering of 'Carabao' Mango (Mangifera indica L.)
Dissertation Abstract:
A trunk injection technique is a feasible alternative of applying flower inducers in mango trees. Injecting 4 mL of paclobutrazol (25% SC at 1g a.i. per meter canopy) in two 4 mm holes (bored at 45° angle, 2.5 cm depth) to 4-5-year-old ‘Carabao’ mango trees grown in polybags resulted to shorter shoot length and wavy leaves, indicating uptake of the compound. Injecting 2 mL of Ethrel (48% SC), four months later resulted in 70 percent flowering, compared with the Ethrel-sprayed trees with 5 percent, and water-injected control with 0 percent. Starch and nitrogen levels in the leaf tissues of treated trees were low. Morpho-anatomical study confirmed the efficiency of trunk injection as a feasible alternative to spraying of Ethrel in mango.
Spraying of alternative bud break agents in paclobutrazol-treated trees showed that nitrogen-based compounds (Ca(No3)2, NH4NO3, and NaNO3) induced 22-50 percent flowering compared with 10-12.5 percent flowering from potassium-based compounds (K2SO4 and KCl). Control trees gave no response. The positive control (KNO3), which exhibited 77.5 percent flowering, was still the best bud-break agent for mango.