A simple method for presumption of bud burst stage in forced culture of Japanese persimmon (Diospyros kaki Thunb.) 'Tonewase' by developmental rate model
2007
Sugimura, T.(Nara-ken. Fruit Tree Research Center, Gojo (Japan)) | Imagawa, J. | Wakisaka, M.
We developed a simple method for presumption of the bud break stage in forced culture of Japanese persimmon (Diospyros kaki Thunb.) 'Tonewase' by the Developmental Rate Model (DVR model). Developmental Index (DVI) at the start of heating (8-24 deg C) related to the number of days necessary for bud burst of cuttings. Based on this relation, we tried to estimate the bud burst stage in forced culture, with minimal air temperature maintained above 8-12 deg C in a greenhouse at Nara Fruit Tree Research Center, using the DVI at the start of heating from late December to late January, mean air temperature and heating days. By this method, presumed error was within 3 days between estimated and observed bud burst stage. This suggested that the bud break stage of 'Tonewase' in forced culture could be simply assumed using the DVR model and minimal air temperature in the greenhouse.
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