ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
EFFECTS OF LIGHT ON THE TIME OF FLOWERING, YIELD AND QUALITY OF CORM FREESIAS GROWN IN GLASSHOUSES |
| Authors: | J.C. Doorduin, C.M.M. van Winden |
| Abstract:
The temperature of the soil in particular has great influence on the process of leaf and flower initiation in freesia. To prevent too high soil temperatures, and thus retardation of flowering, Datch glasshouses with a summer crop of freesia are heavily shaded. The light level in the glasshouse is then only 20 to 25% of the light level outside the glasshouse. In order to investigate the effects of light on the time of flowering, yield and quality a shading experiment was carried out in the summers of 1982 and 1984 with 3 freesia cultivars. Soil cooling was applied to realise optimum soil temperature and to prevent differences in soil temperature as a consequence of differences in light penetration. No effect of shading on time of flowering could be observed. In general with a higher light level in the glasshouse the production was higher and the quality better. The responses of the various cultivars to the increase of light were not identical. | |
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