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Ecological studies on Japanese soy-bean varieties I. Classification of soy-bean varieties on the basis of the days from germination to blooming and from blooming to ripening with special reference to their geographical differentiation



Ecological studies on Japanese soy-bean varieties I. Classification of soy-bean varieties on the basis of the days from germination to blooming and from blooming to ripening with special reference to their geographical differentiation



Japanese Jour Breeding 1(1): 27-39



Ecological studies on soybean vars. collected in Japan, Manchuria, Korea and America, and especially on the leading Japanese vars., were carried out during 3 successive seasons from 1946 to 1948. The period from germination to blooming was shorter when the soybeans were sown late than when sown early, although the blooming date was late. This shortening of the growing period due to the late sowing appears to be more noteworthy in the early than in the late vars. Soybean vars. were classified into 5 groups on the basis of length of the period from germination to blooming, and into 3 groups on the basis of number of days between blooming and ripening. There is some correlation between the 2 classifications. Taking into consideration both varietal responses (time between germination and blooming, and between blooming and ripening), the authors attempted to classify 422 soy-bean vars. into 9 ecological types. Those vars. which reach the blossoming stage in a short time are present in Hokkaido (n. Japan), and with the lowering of the latitude, vars. which require a long period make their appearance; in Kyushu, vars. of both kind are present. In Hokkaido and Kanto districts, vars. of short ripening period predominate. A wide variation in the ripening period was found in vars. grown in Tohoku, Hokuriku and Tosan. Vars. of Kyushu required either a short or a long ripening period. Reasons why these types are so distributed in the respective districts of Japan are discussed.

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