Abstract
The rice variety in one region reflects various conditions of its envirouient. The writer studied on Kujukuri Plain as a rice farming region in ternms of the varieties of rice. As the result, the following facts have been proved: (1) The main rice varieties in this plain are Norin No. 1, Wasegin, Norin No. 29 and Aichiasahi. As for the time of harvest, two months' range is seen between Norin No. 1 and Aichiasahi. (2) The distribution of rice varieties are brought out much more by the social than by the physical conditions. Consequently the rice farming regions of this plain are divided into 5 sections from north to south. (3) In order to increase the value of the rice production, the improvement of the conditions of arable land is to be much more emphasized than the reform of rice varieties is. (4) As far as rice farming of Kujukuri is concerned, the improvement of land conditions did not necessarily result in the change of the rice variety and the two-crop farm at once.
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