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The study was carried out to make clear the actual state of the productivity of paddy rice in Chugoku district from the standpoints of regional and yearly variations and other trends of yield by analysing the statistical data from 1955 to 1962. The results obtained are summarized as follows: 1. The high productivity regions of paddy rice in Chugoku district cover its littoral zone and Miyoshi basin. Yamaguchi prefecture, while, Tajima, Iwami and Oki regions are the lowest. 2. The yearly fluctuations in the yield of paddy rice in the mountainous zone along the Chugoku mountain range is unstable, but stable in Setouchi littoral zone, Tajima region and Tottori prefecture. 3. The yield of paddy rice in Shimane prefecture and the mountainous zone along the Chugoku mountain range is increasing year by year, but is stagnant in the basin and plateau of the San-yo region. In the Setouchi littoral zone and the Mimasaka region stagnation or rather declivity is shown.

Studies on Yield-Forecast in Main Crops : 13. Regional variation of the productivity of paddy rice in the Chugoku district.