CONTROL OF FLOWERING IN CALATHEA CROCATA IN MULTI-LAYER CELLS

**CONTROL OF FLOWERING IN CALATHEA CROCATA IN MULTI-LAYER CELLS**

Authors:	B. PIETERS, R. LEMEUR, G. BOESMAN, P. DEBERGH
Abstract: Flowering of Calathea crocata is induced naturally during short day period. Several experiments have shown that obscuring doesn't always have the same effect : if temperature is too high, flower inductions fails. In consequence, the production of flowering plants through the year requires an excellent control of the microclimate; this can be carried out in multiple layer cells. In this experiment, the effect of several climate parameters on the flowering induction of Calathea crocata was investigated : the daylength was 8 or 10 h; the irradiance obtained by fluorescence 46 or 61 μmol.s^-1 .m^-2; the irradiance by incandescent lamps was 0 or 10 μmol. s^-1 .m^-2; the plants were from two different origins. The effect of the duration of the short day treatment was also investigated.
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