THE USE OF DAYLIGHT PLANT CUVETTES TO MEASURE CLIMATE PARAMETERS INDEPENDENTLY

Three computer controlled Daylight Plant Cuvettes (DPC) were used to investigate the reaction of Pelargonium zonale ‘Präludium’ to partly extreme climate situations. Net photosynthesis rate and destructive ratings served for a comparison of the respective experiments. By increasing the CO₂- concentration from 400 vpm to 800 vpm a considerably higher net photosynthesis was measured. Only slight effects were seen by increasing the CO₂- concentration to 1,200 vpm. Reduction of the PPFD led to significantly reduced results at the destructive ratings.