The temperature of rice growing season at the Kanto-Tozan District

Abstract

In the Kanto-Tozan district we found 5 division based on the monthly average temperature during May to September at the 1°C difference each month.
The grow stages of rice differ about 5 days in each division.
There may be seen, of course, some deviation in each case from the standard owing to the economic and natural conditions but even in these cases we believe it is difficult to make payable farm managment under present social condition more than 2 grades deviation.
We found thus the existence of some definite relation between the growth stage of rice in a certain district the temperature of that period in each district.