Bulbs of three tulip cultivars (Gander, Ben van Zanten and Apricot Beauty) were planted at October 29th in the field without being stored (convention treatment). And at same time, bulbs of same cultivars were stored under 2 degree C (cold-stored treatment) or room temperature (room-stored treatment) for 6 weeks and were planted at December 10th. By the room-stored treatment, flowering occurred later than by other two treatments, and also the flowering period was shorter than by those. In each cultivar, the cold-stored treatment promoted flower bud development and resulted in early flowering. The cold-storage treatment also made tulip flower stalks longer than those of tulips by other treatments. It also caused the improvement of flower quality.
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