落葉果樹の自発休眠に関する研究 : (1) 自発休眠期の開始、完了並びに自発休眠の深さについて

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i) The beginning, the ending and the depth of the rest period were investigated with the deciduous fruit trees of 25 varieties in 9 species inKyoto city and at Inamachi in Nagano Prefecture.ii) As to the beginning time of the rest period, it is not the same with the twigs of the same fruit tree; some are earlier than others and some later. iii) In deciduous fruit trees, the beginning of the rest period is from mid-August to late August with pears, peaches and gooseberries ; it is from late August to early September with apples and walnuts. Japanease percimons, chestnuts, and grapes seem to enter into the deep rest as soon as the rest period begins. iv) The beginning of the rest period happens after the apical bud on the young shoot has ripened. v) As to the deepest period of the rest, it is different among the speciesof fruit trees.With g rapes, chestnuts and Japanease percimons, it begins from lateSeptember to mid October, and with gooseberries and pears, it is mid October and with walnuts and apples, from beginning to late November.vi) All of deciduous fruit frees come out of the rest gradually, and it ends sooner or later according to the species of fruit trees; withJapanease percimons, late December, with pears, peaches, chestnuts,vii) The ending of the rest period is brought about by the effect of the accumulation of hours of temperature below about 45°F.
1953-05-30