1) By the application of high temperature and short day at the same time in the electro-heating hot bed, the growth and the acceleration of flowering time were studied in 10 summer and autumn type of soy beans 2) By the treatment the growth in earlier period was promoted, but later it became inferior to the control. 3) The flowering was accelerated by 20∼58 days by the treatment, and the degree of acceleration was larger in autumn type than in sumer one.
