LED-spectrum Spathiphyllum: Oriënterend onderzoek als bouwsteen voor emissievrije teelt in Kas 2030

Lighting in Spathiphyllum counteracts the growth standstill in winter, helps maintain the leaf colour and promotes compactness. Before this study, there was no experience with LED in practice with this crop, which is normally grown without supplementary light or with HPS lamps in low intensity. LED lighting is an important element for reducing electricity consumption, and contributes to reduce the heat demand in fossilfree cultivation. In preparation for demonstrating a fossil- and emission-free cultivation in Greenhouse2030 at Wageningen UR Greenhouse Horticulture, a short test was carried out in the summer of 2024 under simulated winter conditions. The aim was to make a pre-selection of a suitable LED spectrum, intensity and day length for Spathiphyllum. Results showed that a 16-hour photoperiod delayed the flowering compared to 12 light hours. Flowering, plant weight, plant volume and compactness increased with increasing light intensity. Plants responded better to the lower intensity (67 μmol/m²s PAR) in terms of visual characteristics and leaf quality. The spectra used did not result in differences in plant height or number of flowers per plant. The Green and FR-rich spectra performed best for plant weight and leaf quality (color, mottling, and gloss). No strong cultivar effects were observed in the trial.