自発休眠覚醒モデルを用いたカキ'刀根早生'の加温栽培における発芽期の簡易推定法(栽培管理・作型)  [in Japanese] A Simple Method for Presumption of Bud Burst Stage in Forced Culture of Japanese Persimmon (Diospyros kaki Thunb.) 'Tonewase' by Developmental Rate Model(Crop Production & Cropping Type)  [in Japanese]

カキ'刀根早生'の自発休眠覚醒モデル(DVRモデル)を用いた加温栽培における発芽期の簡易推定法について検討した.加温開始時の自発休眠覚醒程度を示す発育指数(DVI)と発芽が認められるまでの日数との関係は,8〜24℃の加温温度では各温度とも指数関数式でよく近似できた.この結果をもとに,加温開始時のDVI,ハウス内における設定最低気温時の平均気温および加温日数から,奈良県における12月下旬〜1月下旬加温開始の作型の発芽期を3日以内の誤差で推定できた.以上のことから,DVRモデルによる加温開始時の自発休眠覚醒程度に基づき,奈良県におけるカキ'刀根早生'の加温栽培で設定最低気温から簡易に発芽期を推定できることが明らかとなった.

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℃) 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℃ 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.