SummaryWe developed a Developmental Rate Model (DVR model) of Japanese persimmon (Diospyros kaki Thunb.), which was estimated by bud burst rate of cuttings chilled at constant temperatures (0, 5, 8, 11 and 18°C). Temperatures at 5-8°C were considered most effective for breaking bud endodormancy in 'Tonewase'. Based on this model, the endodormancy completion stage of 'Tonewase' was assumed to be December 19-30 in Nara. Bud burst in forced culture, heated with the minimal air temperature in a greenhouse maintained above 15-18°C, can be estimated by the Developmental Index (DVI) at heating start time for bud burst. The DVR model was verified by comparison between estimated and observed bud burst stage in forced culture.
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