Abstract
Applications of gibberellin (GA), benzylaminopurine (BA) and succinic acid-2, 2-dimethylhydrazide (SADH) separately or in some combinations to flowers and fruits of young‘Tosa Buntan’pummelo (Citrus grandis (L.) OSBECK) trees grown in plastic houses during the fruit-growing period were undertaken in 1990 and 1991. The concentrations (ppm) were 20 for GA, 200 for BA and 1000 for SADH.
A large fruit size was observed in the trees treated with GA+BA at 1 or 2 months after anthesis. Single spray of GA, BA or SADH in the same period did not exert a significant effect on the fruit size. Formation of a neck at the stem end was associated with GA application. The application of GA and SADH did not affect the internal fruit quality. Application of BA at 2 months after anthesis resulted in a slightly higher content of total soluble solids (TSS) in the fruit juice. Acid content was not significantly different among the treatments in all the experiments.
