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ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

ORNAMENTAL CROPS TOLERATE LARGE TEMPERATURE FLUCTUATIONS: A POTENTIAL FOR MORE EFFICIENT GREENHOUSE HEATING STRATEGIES

Authors:   F. Buwalda, B. Eveleens, R. Wertwijn
Keywords:   Ficus benjamina, Gerbera jamesonii, Kalanchoe blosfeldiana, Rosa hybrida, development, energy, flowering, greenhouse heating, growth, light, quality, rose, temperature, thermal time
Abstract:
Crop tolerance to temperature flucturation is a prerequisite for more energy-efficient greenhouse heating strategies. Four common ornamental species were tested for their tolerance to fluctuations in temperature. In 16 phytotrons, four different, constant temperature levels and two radiation levels (2.5 and 5 mol PAR m-2d-1) were established in duplicate. Trays with plants were transferred between phytotrons every three days over a period of 72 days. Thus, the plants were exposed to various regularly alternating, constant temperatures patterns at two levels of average temperature (18 and 22°C) and two levels of daily radiation. No adverse effects on production or quality were found. This indicates that in greenhouse climate control, it is sufficient to maintain a certain average temperature.
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