ISHS Acta Horticulturae 71: Symposium on Carnations
THE INFLUENCE OF TIMING AND DURATION OF PHOTOPERIODIC LIGHTING ON THE WINTER FLOWERING OF CARNATIONS |
| Author: | E. Kaukovirta |
| Abstract:
The carnation stands, which bore 180–200 shoots carrying 3–7 pairs of leaves, were given photoperiodic lighting between 5 August and 8 September in treatments where the starting time and duration were varied. In addition, in 1974 the stands were given supplementary lighting during the first cropping period (120 W/m2) with high power mercury lamps put on 35 days after the photoperiodic lighting was terminated. Within the first croppin period, the photoperiodic lighting influenced the quantitative distribution of productivity in all treatments by reducing the October production but increasing that of December. This apparent dual effect of photoperiodic lighting on the distribution of flower production is discused. The quantity of blooms produced during November, January or February was, depending on the starting time and duration of the photoperiodic treatment, either increased or influenced insignificantly by it. Both quantitativity and qualitativity, the photoperiodic lighting had adverse effects on the flowering of the subsequent production period (from March to May). The supplementary illumination given during the first cropping period removed most of these detrimental effects. | |
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