Year-round production of flowering Calathea crocata - influence of light and carbon-dioxide

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    Programmed flower induction of Calathea crocata Morr. et Joris is possible under the controlled environmental conditions of a multilayer growing room. A photoperiod of 10 hours for 9 weeks, growth at 18C, and a photosynthetic photon flux density (PPFD) of 71 mumol.s-1.m-2 induced flowering in more than 95 % of the plants and in 50 % to 80% of the shoots. In the meantime, none of the plants under natural conditions was induced. Significantly more flowers were induced when PPFD during the short-day treatment was 71 rather than 56 mumol.s-1.m-2. Flowers became visible 14 to 16 weeks after the start of the inductive treatment. Moreover, raising the CO2 concentration to 900 ppm for 5 months increased the leaf area and dry weight by 40 and resulted in darker leaf color, longer flower stalks, and significantly accelerated flowering (10 days).
    TaalEngels
    TijdschriftHortscience
    Volume28
    Exemplaarnummer9
    Pagina's (van-tot)897-898
    Aantal pagina's2
    ISSN0018-5345
    StatusGepubliceerd - 1993

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