Abstract
The effect on gerbera cultivar ‘Fredaisy’ of air and soil temperatures in the range 11–21°C has been studied in home-made growth-cabinets providing a sufficient thermal insulation between air and soil. Certain characteristics of the plants in cabinets were compared to those in a greenhouse. Amongst the growth characteristics, the length of the maturation period of the flower and the elongation rate during the early stage of the stem growth were more influenced by air temperature; the interval of appearance of new buds, the final stem length, and the elongation rate at the end of the stem growth, were more influenced by soil temperature. The elongation rates allowed a reasonably accurate prediction of the thermal zero of vegetation.
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