Methods were tested in which fruits were cooled locally to stop maturation, followed by termination of cooling to restart maturation to control fruit harvest of strawberries. Two experiments were conducted: one in which the cooling was terminated all at once to concentrate the harvest in a short period, and the other in which the cooling and termination were repeated weekly to concentrate the harvesting on a specific day of the week. Non-linear regression analysis between temperature and fruit developmental rate (DVR) revealed that maturation was almost stopped below 5.9°C. A local cooling system that cooled only fruits below 5.9°C was constructed, and fruits were inserted into the system when turning stage. The termination of the cooling process all at once led to concentrated harvesting in a short period. In addition, weekly cooling and termination resulted in a considerable fruit yield concentrated on a specific day weekly. This suggested that methods combining local fruit cooling to stop maturation and termination of cooling could control the harvest period to some extent. This information would contribute to maximizing the sales of commercial strawberries because it enables fruit production control according to market demand.

　In greenhouse horticulture, the canopy transpiration rate (Tr) is a dominant factor in water balance and irrigation requirements. This study investigated the relationship between Tr, solar radiation (I), and vapor pressure deficit in air (D) in an eggplant canopy. Tr was measured using open chamber systems for two varieties, ‘Tosataka’ and ‘PC-Oryou’. Simple correlation analysis revealed a strong correlation between Tr and both I and D, with mean correlation coefficients (R) across the two varieties of 0.88 for I and 0.95 for D. However, partial correlation coefficients (R_p) indicated that D had a much stronger direct influence on Tr than I, with mean R_p of 0.84 for D and 0.47 for I. These results suggest that the apparent correlation between Tr and I may be indirectly driven by D. Differences in the relationships between Tr and these variables across the two varieties are likely explained by variations in the leaf area index (LAI). We propose that short-term irrigation management in greenhouse horticulture should consider not only I but also D for greater precision. Additionally, the longterm effects of LAI on Tr should be considered to further optimize irrigation strategies and promote more sustainable water management in greenhouse cultivation.