ISHS Acta Horticulturae 68: International Symposium on Flower Formation in Ornamentals
INFLUENCE OF TEMPERATURE, PLANT DENSITY AND IRRADIATION ON GROWTH AND FLOWERING OF CORM RAISED FREESIAS |
| Author: | N. Bredmose |
| DOI: | 10.17660/ActaHortic.1977.68.10 |
| Abstract:
Productivity in corm raised freesias is much determined by the temperature treatment of the corms, i.e. heating at 30°C and cooling at 13°C given before planting in glasshouse. Our results show that the heat treatment of the corms at 30° for 17 weeks gives a better economical yield and quality, than 30° for 13 weeks followed by 13° for 4 weeks. However the latter treatment gave a faster development. As to cooling treatments the highest yield and best quality was obtained after 2 – 3 weeks in growing room at 13°C/70% RH, even if the flowers developed slower than after a longer time in growing room. Lighting the corms during cooling treatment in a growing room by 40 Watt per m2 resulted in a decrease in weight of corms and cormlets produced per original corm. Increasing the corm size from 5 to 9 cm in circumference increased the number of stems per unit area. It also had a favourable effect on quality and economical output. Raising the plant density from 32 to 128 or from 64 to 128 corms per m2 increased the number of stems per m2, prolonged the formative period and decreased the quality. | |
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