Chemical induces flowering of mango
1989
Peeradet Tongumpai (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture)
Paclobutrazol, a plant growth retarding chemical, is very effective in inhibition of gibberellins biosynthesis. The chemical inhibits the oxidation of karurene which is an intermediate in the step from mevalonic acid to gibberellins. Spraying or soil application of this chemical were done in September, 1984 to Nam Dok Mai Twai no. 4 mango to promote flowering. Flowering was enhanced by soil application of the chemical at all concentrations tested after 2-4 months of treatment. Another experiment was done in April, 1985 to the same cultivar to find out the suitable method of application. Soil application still gave the best result. The experiment was also extended to test with other cultivars namely Khiew Saweoy and Nang Klang Wan by soil application of this chemical. Such treatment improved flowering of mango tree. The treated trees gave more flowering shoots which could be seen at 12-14 weeks after treatment. Internodes and peduncles of treated trees were shortened and they became shorter as the concentration of paclobutrazol was increased. At the present time, it can be concluded that the application rate of paclobutrazol depends on the age of trees. The optimum rate for 2-4 years old trees is 2-4 gm (a.i.) per tree.
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