抄録
Experiment was carried out in 1950 on the influence of the day-length and temperature upon the ripening period of soy-beans. Varieties used for material were Kisaya, Norin No. 2 and Iwate No. 2. The plants were grown in soil by pot culture. In the short-day plots, the day-length was limited to 8 hours every day from 8 a.m. to 4 p.m. and in high temperature plots, plants were placed in an unheated glasshouse. Each treatment was conducted from blooming time until maturing time. The results of the experiments are summarized as follows: 1) Yellow and shedding of leaves and maturing were accelerated by both short-day and high temperature treatment and consequently the period from blooming to ripening of pods was also remarkably shortened in every varieties. From the point of acceleration, there was a slight difference between two conditions where the number of flowers were limited or not limited prior to treatment. 2) The growth of pods was accelerated by both short-day and high temperature treatment, but the acceleration was larger in short-day plots. 3) Short-day and high temperature treatment showed no influence on length and thickness of seed harvested, but the seed-width in treated plots was greater than that of control plot. Weight of seed was smaller in treated plots than control plots, and this trend was larger in short-day plots.
