Abstract
(1) In 1955 and 1956, we investigated the relationships between low t, emperature treatment period and autumn seed production in typical Chinese varieties. (2) The relationships between time of flower-bud differentiation and low temperature treatment period was recognized in middle and late stages, but was not noted in the early stage. The time of flower-bud differentiation varied in proportion to the length of the treatment period. Observation concerning the varietal difference of flower-bud differentiation showed that Kashin was early but Aichi was late, while Matsushima No. 2, Hakushoku-Hotoren and Mikawa were intermediate. (3) The plant which flowered in the warm season or before the 20 th of September, produced good pods, seed-setting, many seeds per pod, and high quality seeds. The quality of these seeds was not inferior to that of spring mattLring seeds, for all practical pur poses. However, extra early flowering plants did not show these good results.
