Abstract
(1) Reasons why soybeans and Adzukibeans grow better in mountain districts than in the plain land, were studies in this paper. Seeds of noted varieties of soybeans (Tanba-guro) and Adzukibeans (Dainagon), produced in Tanba plateau, were grown in the summer season in both Tanba plateau and Settsu plain, in order to compare their growth, especially their maturity. (2) Soybeans and Adzukibeans grown in the mountain districts had the following characteristics compared with those grown in the plain, (a) no signs of excessive vegetative growth or vinings, (b) greater yields of seeds in relation to those of stems, leaves and pods, (c) more seeds per pod, (d) more uniform maturity, (e) fine lustred seed coats, (f) greater absorption power of water of seeds, (g) scarce insect damages. These facts, may suggest that beans grown in the mountain districts, as a rule, show well growth and better maturity and better boiling characters than those grown in the plain. (3) The reason which may explain the above facts, will be probably due to the easy transport of carbohydrates and shapes by lower temprature in the night and the range of air temperature between day and night. The limit of the lowest temperature in the night for their growths was found to be nearly 10°C.
