Comparison of Greenhouse Types and Cooling Systems on Growth and Flower Quality in Dendrobium ‘Big White Jumbo’
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Abstract
The production of Dendrobium orchid cut-flower under a shading net greenhouse is unable to be controlled throughout the years due to seasonal environmental conditions. The greenhouse development is an alternative solution to minimize environmental fluctuation for orchid production. Thus, the objective of this research was to compare the growth and flower quality of Dendrobium ‘Big White Jumbo’ under different greenhouse cooling systems. The experimental design was a completely randomized design with 4 treatments, consisted of a conventional shading net greenhouse (Control: G1) and 3 semi-closed environmental controlled greenhouses (G2–G4) with the size of 6×24×3 meters covered with a plastic roof, enclosed with 4 sides by nylon net. These 3 greenhouses were different in temperature controlling systems as natural air flow (G2), evaporative coolers (G3), and air ventilating fans (G4). The environmental data were tracked throughout the study period (October 2018–November 2019). These results showed that averages of inside air temperature and relative humidity were not different among the 4 systems, but the light intensity in G1 was 1–2 times higher than the others (P < 0.05). The 1st pseudobulbs (3 months old) grown under G2 showed the highest pseudobulbs height (18.42 cm). However, the height of the 2nd pseudobulbs (8 months old) was not different among those in other greenhouses (28.0–31.1 cm). The 3rd pseudobulbs (13 months old) under G1 had the highest pseudobulbs height (34.78 cm). The evaluation of flower quantity and quality showed that the inflorescence number, inflorescence length, flowers number, and flower size of the 2nd pseudobulbs under G1 tended to be greatest, but the vase life (16 days) was not different among the treatments. Furthermore, all pseudobulbs in the greenhouses of nylon net (G2, G3, and G4) had a higher leaf area, leaf greenness, and chlorophyll content than G1.
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References
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