THE INFLUENCE OF TEMPERATURE, IRRADIANCE AND PHOTOPERIOD ON GROWTH AND FLOWERING OF Ruellia `RAJIN CAJIN'

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  • 1 Department of Horticulture, University of Georgia, Athens, GA, 30602

Plants were subjected to daily temperatures of 15, 20 or 25 °C after transplanting to 10cm containers. As temperatures decreased, plants were significantly slower to reach anthesis, however, however no significant differences in visible bud time occurred between 20–25 °C. Night break incandescent lighting or HID lamps for 2 or 4 weeks were used to illuminate plants during the daylight production cycle (0800–1700 hr). No differences in growth or flowering time between HID durations occurred, but both HID treatments resulted in larger plants and one week faster flowering compared with control and incandescent-lit plants. The effect of incandescent light, however, had no effect on flowering time but resulted in significantly taller plants. Additional photoperiod studies were conducted using continuous LD (night-break lighting), continuous SD (black cloth from 1700-0800) and a combination of LD-SD and SD-LD treatments. In all treatments, photoperiod had no significant effect on flowering time or growth, suggesting Ruellia `Rajin Cajin' is a day neutral taxon. Experiments with `Rajin Cajin' suggested in was a 6 week crop from plug to market.

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