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Effects of day length and duration on flowering of Vanda 'Pakchong Blue' |
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| รหัสดีโอไอ | |
| Creator | Soraya Ruamrungsri |
| Title | Effects of day length and duration on flowering of Vanda 'Pakchong Blue' |
| Contributor | Thanida Thanoi, Takonwan Sirisawad, Kanokwan Panjama, Chaiartid Inkham, Panupon Hongpakdee |
| Publisher | Faculty of Agriculture |
| Publication Year | 2568 |
| Journal Title | Khon Kaen Agriculture Journal |
| Journal Vol. | 53 |
| Journal No. | 6 |
| Page no. | 1305-1317 |
| Keyword | flowering, growth, environment, Vanda |
| URL Website | https://li01.tci-thaijo.org/index.php/agkasetkaj |
| Website title | Khon Kaen Agriculture Journal |
| ISSN | 3027-6497 (Online) |
| Abstract | Vanda exporters discovered a problem: the plants would not flower, and information about the factors affecting flowering was limited. Therefore, the objective of this study was to study the effects of day length on the flowering of Vanda 'Pakchong Blue'. The data obtained from this research will be beneficial for flowering control. Vanda was grown in natural conditions for 1 month before being transferred into treatments under 11-13 hours/day in 50% shaded greenhouses (average 350 µmol/m-2/s-1 PPFD). There were 2 factors, i.e. 1) short day at 7 and 9 hours and 2) short day application periods for 3 and 5 weeks. After treatment application, plants were transferred to grow under natural light conditions again. The experimental design was factorial in completely randomized design with (2x2)+1 treatments, and the results found that short day and duration significantly delayed flowering of Vanda 'Pakchong Blue' more than the natural day length treatment. 7 hours of day length for 3 and 5 weeks, and 9 hours of day length for 5 weeks, had the most significant delaying effects on flowering by 32.6, 27.7, and 30.0 days, respectively, compared to natural light conditions. Moreover, it was found that day length applications with 9 hours for 5 weeks showed the highest leaf length of 1.78 cm, and 7 hours for 3 weeks had the highest average leaf greenness at 74.42 SPAD units. In addition, it was found that flower quality and concentration of total nonstructural carbohydrate (TNC) in the stem and leaves were not significantly different among treatments. |
