抄録
Studies of the relation of temperature difference between day and night to the seed development in soybean plant, have been carried out. When the daily minimum temperature difference is large, the flowering time was shortened, and the maturation was accelerated, beside the size of seed and the weight of one hundred seeds were increased. The reason for the result above mentioned would be that the lower the temperature of night was, the more the transitorial materials increased, and the respiration decreased then the consumption of stored substances was smaller than that in higher temperature.
