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1978年日本秋田县北部,苹果早期落果非常严重,尤其是红星落果率达80～100%,受害面积为400公顷,损失达4亿日元。为了探讨早期落果的原因,笔者在前人对内源激素研究的基础上,开展了早期落果与气象因素、树势强弱和修剪程度的关系的研究。本文即为其部分的研究结果。
In 1978, in the northern part of Akita prefecture, Japan, the early fall of apple was very serious. In particular, the falling rate of red star reached 80-100% and the affected area was 400 hectares with a loss of 400 million yen. In order to explore the causes of early fall, the author carried out the research on the relationship between the early fall fruit and meteorological factors, the strength of the tree and the degree of pruning on the basis of previous researches on endogenous hormones. This article is part of the research results.