Abstract:

To survey dynamic growth of fruit in Hylocereus polyrhizus which were treated by hand pollination and natural pollination respectively, horizontal and vertical diameter of fruit were detected each five days from the fifth day after pollination to ripen. Horizontal and vertical diameter, volume and net growth weight were recorded. Comparing curves of dynamic growth of fruit in two treatments, we found that horizontal and vertical diameter increased rapidly in the 5-10 days after pollination in both treatments while the biggest net growth weight occurred at the same time, yet horizontal and vertical diameter in hand pollination group was higher than natural pollinations. Horizontal and vertical diameter increment curve in hand pollination treatment turned out to be double “S” shape while single “S” in natural pollinations. Volume increment kept fast during fruit coloration stage to harvesting stage. To insure bigger net fruit increment, we should enhance fertilizer and water management in initial stage (5-10 days) and late stage (20-25 days) after pollination, .Hand pollination in Hylocereus polyrhizus may raise yield as well as increasing the fruit quality. We explored the rule of dynamic growth of fruit in Hylocereus polyrhizus which may provide theoretical foundation for practical measures such as pollination, water and fertilization management and harvesting as well as provide reference for relevant research.