Effect of day and night temperatures during long photoperiods on the vegetative growth and flowering of Chrysanthemum morifolium Ramat
Jong, J. de; Smeets, L.
Scientia Horticulturae 17(3): 271-275
ISSN/ISBN: 0304-4238 DOI: 10.1016/0304-4238(82)90050-4
The influence of day and night temperatures in the range of 10-17.degree. C on the vegetative growth under long days of 17 year-round cultivars of chrysanthemum was studied. The after-effect of the temperature regime on the time of flowering at 17.degree. C under short days was also recorded. A decrease of the day or night temperature reduced growth, but the effect of the day temperature was much stronger than that of the night temperature. The temperature during the vegetation period had hardly any effect on the time of flowering at 17.degree. C. The consequences for production and breeding are discussed.