Abstract
In the previous investigations it has been that growth substances had many influences upon the development and yield of soybeans. Quite recently the almost similar effects were observed in the studies of bean plants and the results are reported in this paper. Seeds of beans (variety: Turunasi) were sown without washing on 7th and 8th of July, 1942, after soaking in aqueous solutions of α-naphtaleneacetic acid (k-salt) in various concentrations for 24 or 48 hours. Low concentration (0.00125%-24 hours treatment) accelerated the rate of vegetative growth, but the others inhibited it. Leaves of treated seedlings were generally broader and the leaf brades of them became longer in late stage. Unterated plants, controls, began to flower somewhat earlier, but the end of flowering was prolonged by the treatments in proportion to the concentrations of the drugs and the duration of treatments, namely, the controls continued the flowering only for 16 days, but the treated plants more than 21 days. Consequently, the treated plants had more flowers.
