Effect of daytime heating and heat exchange ventilation in a greenhouse on the yield and quality of tomato fruit in forcing culture
2019
Tokunaga, E. (Fukuoka Agriculture and Forestry Research Center, Chikushino, Fukuoka (Japan)) | Mizukami, K. | Hayashida, T. | Ide, O.
In this study, we investigated the effect of combined use of daytime heating and heat exchange ventilation on the yield and quality of tomato fruit in forcing culture. The greenhouse heating temperature was set to 20℃ from 9:00 AM to 4:00 PM (December to March) and heat exchange ventilation was performed by maintaining the carbon dioxide concentration above 350 ppm. The air temperature was maintained at ≥20℃, the carbon dioxide concentration was increased to 390 ppm, and the vapor pressure deficit was increased to more than that of the control. These effects were particularly high on cloudy and rainy days. By improving the environmental conditions, the anthesis interval was shortened, the number of fruit set per fruit truss was increased, and the number of marketable fruits was increased. Therefore, the total marketable fruit yield increased to more than that of the control. In addition, the ratio of irregular and puffy fruits was decreased in April.
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