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RISS 인기검색어
- 검색키워드
- 저자 : Yung-Chiung Chang (검색결과 4 건)
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Phenological Characteristics of Potted Kumquat under Protected Culture
Yung-Chiung Chang,Yu-Sen Chang,Iou-Zen Chen,Lian-Hsiung Lin 한국원예학회 2020 원예과학기술지 Vol.38 No.2
This study investigated phenological changes, shoot growth, and flowering habits of potted kumquat[Fortunella margarita (Lour.) Swingle] grown in subtropical conditions of I-Lan County, Taiwan. The shoots of the second, third, and fourth flushes of kumquat sprouted in mid-May, early July, andearly September, corresponding to 70-80, 112-122, and 168-178 days after the buds sprouted fromthe first flush, respectively. As the flushing sequence progressed, the number of shoots, the rate offlowering, and the number of flowers decreased. There were four flowering peaks in 2010 and fivein 2011. The shoots of the secondary and tertiary flushes still bloomed in 2010, but they did notflower in 2011. In 2011, the second flowering period of the first flush shoot, which flowered inmid-July, fruit set, and fruit growth showed the best performance, and the whole fruit developmentduration took about 169 days.
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Yung-Chiung Chang,Yu-Sen Chang,Lian-Hsiung Lin 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.4
The objective of this study was to determine the level of regulated deficit irrigation (RDI) for the potted ‘Nagami’ kumquat culture. Three treatments, control, RDI 1, and RDI 2, representing 75, 55, and 35% of available soil water content, respectively, were implemented for two weeks after the elongation of the newly-sprouted shoots (the first flush) was nearly terminated. Leaf water potential, leaf photosynthetic activity, shoot vegetative growth, flowering, and fruiting were monitored to evaluate the effects of the RDI treatments. After water withholding for two weeks (stage B), trees treated with RDI 2 decreased considerably in their leaf water potential, and exhibited the highest integrated leaf water potential index, which indicated that their leaves had suffered from the highest level of stress. The net CO2 assimilation rate (Pn) and available fluorescence (Fv)/maximum fluorescence (Fm) and Fv’/Fm’ ratios also decreased substantially in RDI 2-treated trees. However, the stressed trees exhibited compensatory growth, and all growth parameters returned to normal following re-watering. RDI 2 treatment increased flowering potential of the trees, showing the highest average flowering ratio of 50%, which differed substantially from that of the control and RDI 1. No significant differences were observed between the responses of RDI 1 and control, indicating that both treatments were not severe enough to induce a visible physiological effect in trees. By contrast, RDI 2 treatment efficiently changed the shoot growth phase and increased the number of flowers on the shoots, which may be exploited as an efficient approach for kumquat flowering control.
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Temperature Effects on Shoot Growth and Flowering of Kumquat Trees
Yung-Chiung Chang,Iou-Zen Chen,Lian-Hsiung Lin,Yu-Sen Chang 한국원예학회 2014 원예과학기술지 Vol.32 No.1
This study investigated the effects of temperature on the shoot growth and flowering of potted kumquat [Fortunella margarita ( Lour.) Swingle] trees grown in subtropical conditions of I-Lan County in Taiwan. Temperature treatments included T 25-32, T 17-25, T 22, and T 18. The T 25-32 treatment trees were to the day/night temperatures of 25/18°C for 2 weeks, followed by 28 weeks at 32/25°C. T 17-25 was exposed for 4 weeks to 17/10°C followed by 26 weeks at 25/18°C. T 22 and T 18 were exposed at 22/18°C and 18/13°C, respectively, for the entire duration of the experiment. Control trees were placed in a plastic greenhouse under conditions similar to the natural environment. The kumquat trees exposed to high-temperature environment of 32/25°C showed more frequent and speedy sprouting of new buds, but induced the earlier termination of shoot elongation growth, resulting in decreased vegetative growth. The temperature treatments lower than 22°C suppressed the new shoot production but increased the shoot growth period, resulting in increased shoot length and diameter. Temperatures higher than 25/18°C readily induced flowering, with flowering being advanced under the higher temperature conditions such as 32/25°C. However, flowering was substantially inhibited under temperature conditions lower than 22/18°C, indicating the negative role of relatively lower temperatures on flowering of kumquat trees.
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Growth and Union Acclimation Process of Sweet Pepper Grafted by a Tubing-Grafting Robotic System
Yung-Chiung Chang,Suming Chen,Yi-Chich Chiu,Lian-Hsiung Lin,Yu-Sen Chang 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.2
Sweet pepper ‘Andalus’ (Capsicum annuum L. ‘Andalus’) was grafted on chili pepper ‘P’ (Capsicum chinense ‘P’) by hand and by using a tubing-grafting robotic system. After grafting, the growth and condition of the seedlings grafted by machine were similar to that of the seedlings grafted by the traditional hand method. Although the cut interfaces on the mechanically grafted seedlings were more irregular, seedlings’ acclimation process was similar to that of those which had been grafted by hand. This indicates that the tubing-grafting robotic system can be applied generally to grafting operations, thus allowing improvements in production efficiency.
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