ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
GROWTH AND FLOWERING OF RANUNCULUS ASIATICUS |
| Author: | K. Ohkawa |
| Abstract:
Cold treatment of bulbs at 5°C for 4 weeks initiated flower primordia (sepal) in all plants 25 days after the planting. At this time plants became 13.0 cm tall and had 14.8 leaves. There were 5 opened leaves at the flower initiation. The initiation of flower buds in non-cold treated bulbs was later than those of cold treated plants. Irrespective of storage temperature and planting date, all the bulbs sprouted although earliest were those stored at 20°C followed by the order of 15, 10, 5 and 0°C. Sprouting of 0°C stored bulbs was delayed 60 days compared to 20°C stored bulbs. Days to sprouting were longest when the bulbs were planted in September irrespective of the storage temperature. The best greenhouse night temperature for the number and quality of flowers was between 5 and 10°C. Long day treatment hastened flowering and short day treatment prolonged flowering. Thus, Ranunculus asiaticus L. has a quantitative low temperature requirement and is a quantitative long day plant. | |
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