Fruit Cracking of Waxapple(Syzygium samarangense Merr.&Perry) as Related to Irrigation
Date Issued
2009
Date
2009
Author(s)
Yu, I-Hsia
Abstract
With the advance of technology in production-season adjustment, the fruits of waxapple can be produced in the winter, spring and summer. Unfortunately, those fruits mature in warm season crack seriously. The experiment was done in the commercial orchards at Jia-Dong and Fang-Shan townships of Ping-Dong County to investigate the effects of changing water potentials of trees by adjusting the irrigation frequency on the fruit cracking and quality. During the period of extensive fruit growth irrigation was withheld and daily-irrigation was acted as control at Jia-Dong. At the same period irrigation was implemented daily compared with control which irrigation was done every 2-to-3-day interval at Fang-Shan. Tree water potentials, either predawn or mid-day, were not significantly different between treatment and control with two sequential years of experiment. The percentage of fruit cracking of water-withheld trees was higher than that of daily-irrigated ones at Jia-Dong but no significant difference at Fang-Shan. Cracked fruits had higher total-soluble-solid content than intact ones. Once the total-soluble-solid contents in the fruits between stem-end and stylar-end became significantly different the fruits began to crack. Regrettably water potential of trees did not differ after adjusting soil water content and hence did not result in the clear response on fruit cracking. Alternatively, other factors, instead of soil water content, may be involved in fruit cracking of waxapple under current cultural condition in Taiwan and is worthwhile for further study.
Subjects
蓮霧
裂果
灌溉
Type
thesis
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