| Summary: | 碩士 === 國立中興大學 === 園藝學系 === 88 === The purpose of this study is trying to use root pruning, water interruption, bulb size, gibberellin acid (GA3) and bulb storage temperature to understand the flowering regulation of Hippeastrum hybridum Hort. Root pruning could increased growing rate, but flowering was not promoted in ''Red Lion''. Saving root length for 10 cm when planting could obtained largest number and longest leaf. Root pruning could also increase bulb''s secondary (branched) roots and has good rooting system. Excised all the root resulted in lose plant stand support, leaf growth, short first scape, and least primary roots.
Holding water supply up to 8 weeks could increase flower bud development but not affect the flowering quality on ''Red Lion''. Eight weeks of water interruption resulted in the earliest flower emergence and flowering. Water interruption also has a phenomenon of large number of secondary (branched) roots. Bulb size could affect the flowering of ''Apple Blossom'' and ''Picotee''. As bulb size increased, the early flowering was increased. Number of florets and scapes of large bulbs were more than that of small bulbs. Gibberellin acid also affect Hippeastrum hybridum Hort. cv. Best Seller flowering. As GA3 concentration was increased from 0 to 100 ppm, flowering rate, first scape, and leaf length was increased.
''Apple Blossom''、 ''Picotee'' and''Red Lion''of bulbs were stored dry in 5、9、17, and 25℃ for 2 weeks could be improved flowering. The results showed that the higher temperature the later anthesis, also the longer leaf. Besides, bulbs treated in 3 group of varied temperatures (A:25℃(2 weeks), 17℃(2 weeks), 9℃(2 weeks), 5℃(2 weeks)； B:25℃(2 weeks), 17℃(2 weeks), 5℃(4 weeks)； C:25℃(2 weeks), 5℃(6 weeks)) and one of constant temperature (25℃(8 weeks)) for contrast. The results showed each group of varied temperatures got earlier anthesis. However, bulbs after dry storage treatment lose significantly weight and size, but got several offsets as replanting of''Apple Blossom''. Bud emergence to first flower anthesis needs 3 to 8 weeks, and the growth rate of scapes during the earlier emergence stage was much slower than that of the later stage.
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