Spatiotemporal temperature distribution in the canopy of summer-to-autumn flowering chrysanthemum under different zone cooling methods
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Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744 Motooka, Nishi-ku, 819-0395, Fukuoka, Japan
Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, 819-0395, Fukuoka, Japan
Fukuoka Agriculture and Forestry Research Center, 16-3 Ishigaki, Tanushimaru, Kurume, 839-0827, Fukuoka, Japan
Daisuke Yasutake   

Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, 819-0395, Fukuoka, Japan
Final revision date: 2023-01-05
Acceptance date: 2023-01-10
Publication date: 2023-03-09
Int. Agrophys. 2023, 37(2): 129–139
  • Different zone cooling methods were applied to the chrysanthemum canopy.
  • Spatiotemporal temperature distribution under the zone cooling was elucidated.
  • The base cooling efficiently cooled the canopy both during the day and night.
  • The top cooling method efficiently maintained the optimum temperature at night.
Avoiding high-temperature stress effectively can ensure sufficient plant production in hot seasons. Therefore, we proposed the use of zone cooling to decrease the temperatures around the chrysanthemum canopy using a heat pump and duct at the bottom (base cooling), top (top cooling), and above (above-top cooling) the canopy. The spatiotemporal distribution of temperatures (air, leaf, and stem temperatures) was measured under the various zone cooling treatments applied, and compared with those under the treatments which were not subjected to cooling (no cooling) and were entirely cooled (entire cooling). The air temperature around the targeted cooling regions and some plant temperatures declined substantially under the base and top cooling treatments at night, but such a decline was not observed with the above-top cooling treatment. During the day, the cooled region under top cooling was directly affected by solar radiation, but this region was unaffected under the base cooling treatment. The cold air was maintained at the bottom. The results indicate that solar radiation substantially influenced spatiotemporal temperature distribution. Moreover, base cooling was found to be the most effective method during both day and night. Thus, this study examines the spatiotemporal temperature distribution under zone cooling methods in the chrysanthemum canopy, thereby advancing our understanding of the fundamental knowledge required for the establishment of a practical zone cooling system.
We are grateful to the staff members from the Fukuoka Agriculture and Forestry Research Centre, and to former and current students from the Laboratory of Agricultural Meteorology, Kyushu University for their warm support in conducting our experiments.
This study was financially supported by the Grant in Aid for Scientific Research (No. 20KK0148) (2020-2023) from the Japan Society for the Promotion of Science.
The Authors declare they have no conflict of interest.
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