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The first study was undertaken during fall 1989 and the second in winter 1990 using  Callistephus chinensis  `Pink Carpet', and  Calceolaria herbeohybrida  `Anytime mixture' seedlings. In both experiments, four photosynthetic photon flux levels were used; 30, 60, 90 and 120 mmol m -2  s -1  to obtain a 16 hr photoperiod. All lighting treatments were provided by HPS lamps (400 W) and compared to natural light condition (control). The utilisation of this electrotechnology not only increased vegetative growth but also reproductive development which resulted in shortening production time. Flower number was also greatly enhanced. Differences measured between control plants and those having received a supplementary light treatment were greater during fall 1989 than winter 1990 study.

INFLUENCE OF PHOTOSYNTHETIC PHOTON FLUXES ON CALCEOLARIA AND ASTER