Abstract

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.

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