Rekken en strekken in de schaduw: Optimaliseren LED Spectrum bij schaduwplanten, met potanthurium als modelgewas

LED is needed to reduce the energy consumption of lighting in greenhouse production. The first experience with Full LED in pot Anthurium resulted in increased growth, but also in strongly elongated flower stems and leaf damage. With this research we have tested in two short trials and confirmed the hypothesis that stretching and leaf damage can be avoided by LED spectrum more suitable for shade plants and shorter days. Six LED spectra with different R:FR ratios were compared in a background of limited daylight (winter conditions). Results showed that flower and leaf height can be limited by lowering the R:FR ratio (reverse reaction than light-loving crops) without decrease in plant growth or quality. Two fotoperiods were compared. The longer day resulted in proportionally more fresh weight, but stimulated leaf spots and with an unfavorable R: FR also increased stem elongation. Indications have been found for increased photosynthesis efficiency at lower R:FR ratio. To explain all these effects, more and longer research is needed.