An Enlightened View on Protected Cultivation of Shade-Tolerant Pot-Plants: Benefits of Higher Light Levels

F.R. van Noort, J. Kromdijk, S.M. Driever, T.A. Dueck

    Research output: Chapter in Book/Report/Conference proceedingAbstractAcademic

    Abstract

    Commercial protected cultivation of shade-tolerant pot-plants in the Netherlands has expanded enormously in the last decade. Typically, very low daily light integrals are applied (3-5 mol PAR m-2 day-1), which are achieved by use of heavy screening and application of a layer of chalk (CaCO3) on the outside of the greenhouse to increase reflection of incoming irradiance. Although these low daily light integrals are meant to avoid damage by high light intensities and/or high temperatures, it is clear that they carry a production penalty, since potential crop growth is directly related to the amount of light that can be captured and efficiently used. Additionally, it remains unclear whether current daily light integrals are too conservative, which would create room for optimisation. Recently, a number of experiments have been carried out to examine the possibilities and limitations for cultivation of several shade-tolerant pot-plants at higher daily light integrals. For most species, plants could be grown faster when more light was allowed. Also, a significant reduction in energy use for heating could be achieved if more natural irradiance was allowed to enter the greenhouse. However, use of more light required higher levels of relative humidity to avoid light damage. In this paper, we present a synthesis of experiments, as well as an outlook to further improvements
    Original languageEnglish
    Title of host publicationProceedings of the 7th International Symposium on Light in Horticultural Systems (Book of Abstracts)
    EditorsS. Hemming, E. Heuvelink
    Place of PublicationLeuven
    PublisherISHS
    Pages80
    Publication statusPublished - 2012
    EventVII International Symposium on Light in Horticultural Systems - Wageningen, Netherlands
    Duration: 15 Oct 201218 Oct 2012

    Conference

    ConferenceVII International Symposium on Light in Horticultural Systems
    CountryNetherlands
    CityWageningen
    Period15/10/1218/10/12

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