春播蕪菁の花芽分化に就いて

概要

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Three seasons data on the flower-bud formation in turnip varieties may be summarized as follows: 1. It took about 50_??_60 days after sowing to reach to the period of the flower-bud formation in spring planting, and about 60_??_80 days `in autumn planting. The turnip required 20_??_30 days more than the Japanese radish to form flower-buds from sowing. 2. There were considerable differences in the periods of the flower-bud formation among varie-ties. When sown in April, early one reached the period after about 50 days, and late one did notform flower-buds even after 65 days. According to the longevity of the period, turnip varieties may be classified into 4 groups. 3. The flower-bud formation of the turnip is proved to be hastened by low temperatures as same as the Japanese radish, Chinese cabbage and others. Practically the bolting seems to fail if the seed were sown after May. 4. There seems no direct relation between the period of flower-bud formation and the occurrence of pithyness.
園芸学会の論文