ISHS Acta Horticulturae 189: I International Symposium of the Research and Cultivation of Roses
FORCING POT ROSES FROM OWN-ROOT CUTTINGS; EFFECT OF GROWTH RETARDANTS AND LIGHT |
| Authors: | Y. Mor, A. H. Halevy, Anton M. Kofranek, J. Kubota |
| Abstract:
Forcing experiments of pot roses for Christmas, Easter and Mother's Day were carried out in Davis, CA. Own-rooted cuttings of 5 'Meillandina' cultivars and 'Red Garnette' were used. The efficacy of the treatments was evaluated by the average number of days from cutback to flowering, the number of flowers per plant and the height and diameter of the plants. Plants that were exposed outdoors to a period of low temperature performed better, than those grown continuously in the glasshouse, by producing more flowering buds per plant. Chlormequat promoted flowering when applied as a soil drench, but had little or no effect at all as a dwarfing agent. Ancymidol was more effective as a growth retardant, it, however, promoted flowering only in a few cultivars. Lighting plants at night with fluorescent lamps (2.8 W.m-2), during forcing promoted branching and flowering. Mixed fluorescent and incandescent light of equal irradiance reduced this effect. | |
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