The Rice Crops in Okayama Prefecture compared with the Sun-Spot Variation

Abstract

The author compared the record of the rice crops in Okayama Prefecture for 37 years beginning in 1887 ending in 1923 with that of the sunspots activity in the same period expressed by the annual sum of the total sunspots area. The relation between them was not remarkable but the author pointed out the existence of the tendency that the crops decreases in the first and fourth year after the appearence of the sunspot minimum and increases gradually in the second and third year. The amount of decrease was 20% of the average value in the worst case.