Effect of Night Temperature at Ear-developing Stage on Rice Plant

摘要

In the warmer district of Japan, effect of night temperature after maximum tillers stage upon the growth and yield of rice plant was observed (1952- 1955). In a series treated from the maximum stage, high night temperature (higher than natural at least 2°C) promoted the "Akiochi" phenomenon and decreased the grain yield, but 2°C 1ower plots did not, and 8 showed highest yield. On the other hand, in the series treated from the heading stage, higher temperature resulted in superior yield than natural and lower temprature inferior yield.