梨の凍害に関する一實驗(1)

概要

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In recent year, the frost prorection in an orchard is very serious problem in our country. Therefore, we made an observation on the frost injury from the view point of agricultural meteorology. In our observation, on the April 9th 1954, each blossom of the two varieties of pears (Pyrus serotina) Nijiseiki and Yakumo, cultured in pots, were both exposed to the constant temperatures of -1℃ and -3℃ for about an hour in the low temperature room at the Meteorological Research Institute in Suginami-ku Tokyo and then they were planted in an open field of that Institute. The dates of the blooming of clusters of flowers are shown in Table 1 in the text. The results of our observations are shown as follows: -(1) The low temperatures kill a large percentage of blossoms of Nijiseiki, while they do not do so in the case of Yakumo as sh wn in Table 2. (2) The appearance and the shape of the damaged fruits in both varieties were not normal as compared with that of normal fruits in th orchard. Therefore, in our present observation, it may be said that the damage to pear fruits caused by frost injury depends upon the varieties, the stage of flower development and the location of flower clusters.
千葉大学の論文
1956-03-10