Temperature and Light Integral Effects on Growth and Flowering of Hybrid Geraniums
| Autor: | J.W. White, I.J. Warrington |
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| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | Journal of the American Society for Horticultural Science. 113:354-359 |
| ISSN: | 2327-9788 0003-1062 |
| DOI: | 10.21273/jashs.113.3.354 |
| Popis: | ‘Red Elite’ hybrid geraniums were grown in controlled environment rooms and greenhouses with 109 combinations of daily light integrals (DLI) ranging from 9 to 25 mol·day−1·m−2 and daily mean temperatures (DMT) from 13.5° to 22.5°C. The time between seedling emergence and macrobud did not change significantly until the DLI was < 13 mol·day−1·m−2 (at 18° DMT). Flowering will not occur below a DLI of 3.3 mol·day−1·m−2. The time between emergence and macrobud progressively decreases as DLI increases until a DLI of close to 13 mol·day−1·m−2 is reached, and with increases in DLI above ≈17 mol·day−1·m−2 there is virtually no increase in the developmental rate of flower buds to the macrobud stage. Rate of development response of ‘Red Elite’ to temperature over the 9° to 27° range was curvilinear. DMT had more influence that DLI between 14 and 25 mol·day−1·m−2 on the time of flower development from macrobud to anthesis. The rate of development response over the 13° to 27° range was linear, and a heat sum relationship could be used to predict flowering. Increased DMT reduced the time between sowing and flowering with consequent reduction in dry weight and flower and bud numbers. |
| Databáze: | OpenAIRE |
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