Relation between the Yield of Wheat and the Weather Factors. Part I

Studies on the Relations between the Yield of the Important Crops and the Weather Factors in Japan. No.6

Abstract

The coefficients of correlation between the yield of wheat and the weather factors (monthly mean temperature, monthly amount of rainfall and monthly total hours of sunshine) have been calculated by the method previously reported in this journal, for each prefecture in Japan and each month during the cultivating period. The correlation coefficients calculated are shown in tables 1, 2 and 3.
1. The correlation between the yield of wheat and the temperature is positive in the northern district and negative in the southern district.
2. The coefficients of correlations of the yield with rainfall and with sunshine indicate obviously that the rainless, sunny weather throughout the cultivating period is favourable for wheat culture.
3. The correlation of the yield with rainfall is closer than that with any of other weather factors.