Abstract
1.In the methods of commercial seed productionof cabbage in Japan, there is a method which harvestsseed from premature seed mother plants by meansof summer-sowing culture.By this method, if thesowing too late and the growth is checked, itcauses frequently irregular bolting(Fig.1), so thatseeds may be degenerated. It is serious matter inseed production especially in fall-sowing varieties.This study was performed in order to make clearthe above point.2.The experiments were done at the ShizuokaAgricultural Experiment Station during the period of1948-51, and the tested variety was the Fuji-wasecabbage, a leading variety of fall-sowing early varieties in Japan.
