1994 Volume 63 Issue 3 Pages 639-644
The effects of various storage temperatures on Narcissus bulbs and their duration of storage on the initiation and development of flower buds were investigated. Special attention was paid to the retardation of flowering.
1. The development of flower buds progressed most rapidly at 20°C, followed by 25° or 15°C and 30°C. For bulbs stored at 15° or 20°C, the mean flowering date was earlier, but flowering percentage and the number of florets were smaller than in those at 25°C, whereas bulb storage at 30°C delayed flowering. Therefore, a temperature of 25°C was considered to be optimal for storage.
2. The temperature range between 15° and 20°C was optimum for the development of flower buds between the carpel formation stage and flowering. At 25°C flower buds ceased to develop and became blasted.
3. Flowering was retarded when bulbs were transferred to 5° or 10°C and stored for up to 11 months. After cold storage, bulbs should be kept at 30°C for 3 weeks to initiate flower buds and then at 25°C for 12 weeks to promote further development; thereafter they should be grown at 15°20°C.