Flowering and fruit growth of pitaya (Hylocereus undatus Britt. & Rose) are studied. Growth period of flower bud from visible to anthesis (31.2 cm in length) is 17 days. Anthesis occurrs from sunset to sunrise the next day and flower attains maximum (23.4 cm in diameter) around 1:00 am, Fruit growth shows single sigmoid pattern. The red frail (average weight 339g) can be harvested 33 days after anthesis and total soluble solids attain maximum (19.5 Brix in center of flesh). Frail weight can much 487g when harvested 50 days after anthesis. However, the changes of total soluble solids are nut significant from 33.1050 days after anthesis.
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