Influence of Paclobutrazol on Flowering and Fruit Set in Mango

Abstract

A study was made under farm-orchard conditions in Nontaburi province near Bangkok, of the effect of paclobutrazol application on off-season flowering and fruit set of the mango variety Kaew-Sawaey. Four year old mango tress of approximately the same size was selected for the study. The treatments comprised zero, 1, 2, 4 and 8 gm of paclobutrazol dissolved in two litres of water, the solution begin applied to the soil surface of individual treatment trees. There was a clear effect on the inducement of earlier flowering, the higher the application rate the greater the effect. The effect on flowing was also reflected in the number of off - season fruit per tree, mean fruit number with the progressive increases in paclobutrazol application rate begin 0, 0, 5, 1, 21, 2, and 23.0, respectively. However, total fruit yield (off-season plus seasonal fruit yield) was greatest with the application rate of 4 gm (in two liters of waster) per tree; total yield declined at the higher application rate. The respective total fruit yields applications rates of 0, 4 and 8 gm per tree were 10.4, 103.4 and 51.9 fruit per tree.