Abstract
This experiment were carried out to analyze the effect of light intensity upon the tillering of rice plant using Mihonishiki variety by water culture in 1961. The main results obtained were as follows: Effect of light intensity on the tillering of rice plant was remarkable, but it was not always the same. It was considered that the variation of the effect was caused by the difference of the growing stages or by the time and degree of shading treatment. Therefore, it seemed difficult to determine the limit of light intensity needed for the occurrence of tillers. However, throughout every period of the tillering, a distinct difference was observed in the number of tillers between 200 calories and 300 calories of light intensity per day, so it was thought that the limit of light intensity might be about 200 calories per day in the tillering period.
