Even though it may be true that the water requirement of rice plants is generally higher than those of other crops, the submerged condition is not necessarily reguired for rice growth. The moisture requirements of rice vary according to its growing stages and it is possible to increase the irrigation efficiency by means of lessening the loss due to percolation and evaporation in the field. This experiment was conducted on the two irrigated conditions, one for submerged and the other saturated, in order to investigate the effects of rice production. In this experiment, two plots were prepared; a control plot and a treatment plot. In the former, the irrigated water was maintained about 10cm in depth and the later almost saturated condition during the whole period of rice growth except for the transplanting period from 17th to 24th of June. The results obtained in this experiment are as follows: 1. Numerical data in connection with yields and yield components were statistically tested by the F-distribution method. There was no significant difference in yields and yield components between the above-menti oned two treatments, i.e. the control and unirrigated plots. 2. However, it was observed that, in several items such as the number of heads per plant, the number of total grains and the number of grains per head, rice plants in the unirrigated plot showed higher values than those in the control plot. 3. On the other hand, the maturing rate of rice was higher in the control plot, even though it was statistically unsignificant. 4. As for the physical and chemical soil properties, the control plot showed a higher sand content in the soil, while the fild moisture content and soil fertility was not different beween the two treatments. A higher phosphate content in the soil was observed in the unirrigated plot, though it was not high enough to be effective for the growth of rice plants. Besides, in the unirrigated treatment the soil temperature was about 20℃ higher in average than that in the control. 5. The above results lead to the conclusion that no remarkable differences in yields and soil properties are made by the unirrigation treatment. However, it is apparent that this treatment has some advantages in the points that one could spare the amount of water supply for irrigation without decrease in yield. In addition, a higher soil temperature and a brisk Oxygen supply would be possible through this treatments. Accordingly, this treatment would be a more reasonable and economic cultivation method of rice for the better harvest.