輸出チューリップの開花促進に関する研究(第2報) : チューリップ球根の高温処理が開花促進に及ぼす影響に就いて
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概要
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This experiment was carried out in order to clarify the effects of high temperature treatments (30°C., 35°C., and 40°C.) on flower forcing of the tulip bulbs for export. The bulbs were treated without ventilation in 1951, and under ventilation in 1952. High tempera-ture treatment under ventilation was more favor-able and promoted flower bud differentiation a few days than the treatment without ventilation. The higher the temperature of the treatment, the more the flowering time promoted; but higher temperature increased the blind. For “Feu Bril-liant”, as 40°C. treatment caused higher percent-age of blind, 35°C. seemed to be suitable. For “William Pitt”, the more drastic treatments (40°C. -one day, or 35°C.-one day-40°C.-one day) were best. The bulbs treated by these methods bloom-ed about ten days earlier than the untreated ones. In the bulbs recieved the high temperature treatments under ventilation, the time of flower bud differentiation was delayed for five days, but the flowering time was distinctly promoted. It is considered form these results that the tulip bulbs treated with high temperature had passed through the rest period more quickly and became percep-tive of the effects of the following cool tempera-ture. As the bulbs treated with high temperature produced weeker flowers, stems and leaves, the bulbs which will be treated for flower forcing with high temperature should be the ones of ex-cellent quality.
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