日本に於ける大豆品種の生態学的研究 : 1.開花日数と結実日数による品種の分類とその地理的分布に就いて

抄録

The present paper deals with a ecological studies on the soy-bean varieties, collected from Japan, Manchuria, Korea, America and especially on the leading varieties of Japan. The experiments were carried out on the field of the Kqnosti Ekperimental Farm, Agricultural Experiment Station, Ministry of Agriculture and Forestry, during three successive seasons irom 1946 to 1948. The results dbtained are summariied a follows : ( 1 ) In soy-bean varieties, there is a wide variation on the days from germination to blooming. It was found from the experiment of r94:6, in which the varieties were sown at the different planting times that the days from . germination to blooming became shortef when sown late than sown early, although the blooming date was, late, and this shortening due to the late sowing appears to be more remarkable with early varieties than with late varieties. ( 2 ) On the basis of the varietal responses. observed from the late sowing experiment : in 1946 sown at the 8thof May and in 1947 at 10 th of Imay soybean varieties were classfied into five groups from the s'tandpo.int of the days from germination to blooming. ( 3 ) In soy-bean varieties, there is a wide v.ariation: on the days from blooming to ripening, too. On the basis of the result of the experiment a above mean.tiond, soy-bean varieties were further classified into three groups from the standpoint of the days from blooming to ripening. ( 4 ) In soy-bean varieties, there is in soine degree, a correlatiop! between the days from germination to blooming and the days from blooming to ripening. ( 5 ) Taking into consideration the both variete.l responses ; days from germination to blooming and that from blooming to ripening, we attempted to classify soy-bean varieties including 4-92 used as material in past three years into nine ecological types. Those varieties which require short period to reach blooming are 'found in Hokkaido and with the lowering . of the latitude those which require a long pericd make their appearences, while in Kytrhu, they are both of short and long period. ' And, in Hokkaido ' and K;nto distr, icts, those varieties of short ripening period are 'distributing. A vride var-iation in the ripening period was found in varieties grown in Tohoku., Hokuriku and Tosan distric.+s. Thosd varieties from the other districts were of lbng"ripening, period, while the varieties of Kyushu were of short and long ripening period! We discus-sed a reason why these tvpes distribute in respe-ctive districts of Japan.