抄録
On the culture of the rice plant in the northern region, it is usually required to accelerate the growth and ripeness of the rice plant in some way, and to gain the stable yield of the crop. From this point of view, we have studied for these 3 years about the effects of the double treatment of the high temperature vernalization and the short day treatment for rice species, using an electric hot seed-bed. The result (1949) follows: Some species were accelerated the growth and ripeness in paddy-fields by the 10 days high temperature (25∼35°C) and the succeeding 15 days short day (8 or 10 hrs. day) treatment in the period of nursery seedling, and tbeir yields of rice were increased by about 10%. We think this method is simple and it will be able to be applied practically for the rice culture.
