Abstract
In cultivation of soybean "Ou No.13", under the same condition of external environment and different ones of seed-weight which may relatively be called internal environment, the effects of seed-weight on growth and ecological form of the plants are generally very little. But the yields are as follows; [table] It means that the cultivation using selected grains of larger weight yields more 2.61 To per Tan and grains of more volume, fat and starch than no selected. It may be that the "Ou No.13" has been cultivated so long that the stability of the variety has changed worse and the result of group selection practice proved effective.
