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

[摘要] The coefficients of correlation between the yield of barley 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 magazine, for each prefecture in Japan, in each month during the cultivating time.The correlating coefficients calculated are shown in table 1, 2, 3. and the main results are as follows:1. The correlation coefficients between the yield of barley and rainfall are mostly negative in each month during the cultivating time, and they show that the rainfall has most important influence upon the yield than the other weather factors. The most close correlation with the yield and rainfall is found at the winter time in Tohoku-and Hokuriku districts, at the early time of growth in Kinki-and Tyugoku districts and at the ear appearing time in Kanto districts. It is noteworthy in this research that the correlation at harvest time is not so close in each prefecture that we expected.2. The correlation between the yield of barley and sunshine is mostly positive. The cultivating time in which the yield and sunshine has most close correlation, is not similar for the prefectures.The close correlation between the yield and sunshine appears at an early stage of growth as well as at the time of ripening to harvest in Kanto districts, while it appears only at the time of ripening to harvest in Tokai, Sikoku and Kyusyu districts.3. The correlation between the yield of barley and temperature is not so close as that with the above weather factors, and the relation in the northern part of Japan differs somewhat from that in the southern districts.

[学科分类] 大气科学