Abstract
In Hokkaido, the yield of rice-crop is influenced more by the natural environmental condition than by the social condition, as the place is situated in the border region of rice culture. Human efforts in rice culture over there had been often vainly consumed in the past cool summers.
When we try a factor analysis for the rice-yield in such a region, it is not so difficult problem to know what factors are more concerned with the region than with the other parts of Japan. We adopted a factor analysis for the rice-yields of 12 districts in Hokkaido covering the period of 35 years and obtained a factor load diagram as shown in Table 1.
