施肥法の改善によるチャの裂傷型凍害の防止法 (〔日本茶業技術協会〕創立30周年記念) -- (チャの裂傷型凍害に関する研究)

概要

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The influence of manuring methods on the cold resistance of young tea plants during the occurrence period of the bark splitting injury was investigated. The young tea plants fertilized with one third of the current doses of nitrogenous fertilizer and with no nitrogenous fertilizer in autumn, (Sept. to early Oct.), obtained the cold hardiness more early than the normally fertilized one did. However, normal usage of autumn fertilizer in early Aug. after summer fertilization was omitted and the normal doses of nitrogen if their application was made very early, such as in July or suspended untill such late time as Nov. accelerated the cessation of autumn growth and the hardening of the young tea plants. The growth of the young tea plants well-fed with basal manure plus summer dressing was not affected by the time of autumn manuring. The potassium effect on cold resistance of the tea plants was not detected, although there has been many reports on it. These results suggest that the later manuring in autumn is better choice for prevention or reduction of bark splitting injury in dangerous regions.
日本茶業技術協会の論文