Contributions to the Damage of Rice-Crops caused by Abnor_??_ally Cool Temperature during Summer Times in Hokkaido

Abstract

In the northern part of Japan, we sometimes have a summer with occasional days of abnormally low atmospheric temperature and experience serious failures of the rice-crops after such a season.
In this paper, we have investigated the relation between the climatic conditions of abnormally cold summer and the local damage distributions of rice-crops in Hokkaido. Weather conditions of abnormally cool summer in Hokkaido were divided into the following four types, (1) dry cool summer, (2) wet cool summer, (3) combination type (summer with scanty rain and sunshine) and (4) miscellaneous type.
Comparing the four weather types with the damage to the rice-crops, we have found that serious failures were experienced after summers of (2) and (3) type, especially the former, and also that a dry cool summer was usually followed by only a slight damage in that district.