Time and Spatial Variations of yield per 10a of Paddy Field Rice in japan
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概要
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This paper aims to explain objectively the time and spatial variations of yield per 10a of paddy field rice in 46 prefectures of Japan, using the means of simple regression analysis and principal component analysis. The results are summarized as follows:1. The yields per 10a of paddy field rice of any prefectures and years (1946-1979) show positive correlations (Figs. 1, 2 and 3), and their relationships are given by 46 simple regression equations (Tab. 1). According to the distribution of simple regression coefficients (Fig. 4), it can be considered that the simple regression equation indicates the technical level of rice crops.2. Eliminating the improvement of rice crop techniques from the secular variation of yield per 10a of paddy field rice, nearly 50% of residual is explained by the first component (Tab. 1). This component, which represents same sign over all prefectures (all positive or all negative), explains higher yield type over Japan or lower yield type over Japan (Fig. 5) and fluctuates harmoniously with the temperature in July and August (Figs. 6, 7 and Tab. 3). It means that temperature in summer is a important controlling factor of yield per 10a of paddy field rice in Japan.
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