Abstract
1. In the present report, the statistics of rice production per unit area (koku/tan) for fifty six years from 1893 to 1948 in the eight counties in Aomori Prefecture were analyzed with the definition of bad harvest informed by the complementary and introduced seedings were used and the adjusting and managing the rice crop was imperfect, many paddy-fields turned into seeds-mixed fields. This was found much in the late rice zones. 5. The rice's sterility was brought about by the gush of cold water, the submergence, the water-stagnation and drought, of rice fields. 6. The increase of disease, blights and weeds was recognized in every zone.
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