S06 - Session P13 - Effects of short day and temperature on growth and flowering of Vanda hybrid

Authors: Soraya Ruamrungsri, Poramet Pechkaow, Chaiartid Inkham, Kanokwan Panjama *

Vanda is an economical important orchid in Thailand. However, the information of Vanda flowering control is still limited. Therefore, this research was aimed to study some environmental factors on growth and flowering of Vanda hybrid. Vanda Red Spot were grown under short day (SD) condition (16 h) for 2, 3 and 4 weeks and moved to the evaporative cooling greenhouse compared to those that grown in evaporative cooling greenhouse or 50% shading greenhouse throughout the experiment (control treatment). The experimental design was complete randomized design (CRD), 5 treatments and 20 replication per treatment. The results found that plants grown under SD for 4 weeks gave the highest percentage of flowering whereas plants grown in 60% shading greenhouse did not flowering. Plants grown under SD condition for 4 weeks also had the widest of flower width average 11.5 cm. Thus, low temperature stimulated flowering in Vanda and growing Vanda under SD condition for 4 weeks and transplant to evaporative cooling greenhouse is proper for Vanda production.