Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 486632
Title Lage intensiteit LED belichting in zomerbloemen en trekheesters : praktijkonderzoek naar effect van stuurlicht op vroegheid en kwaliteit
Author(s) Helm, F.P.M. van der; Kromwijk, J.A.M.
Source Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1348) - 52
Department(s) GTB Teelt & Gewasfysiologie
Publication type Research report
Publication year 2015
Keyword(s) glastuinbouw - snijbloemen - struiken - belichting - led lampen - lichtsterkte - blauw licht - rood licht - verrood licht - plantenontwikkeling - greenhouse horticulture - cut flowers - shrubs - illumination - led lamps - light intensity - blue light - red light - far red light - plant development
Categories Cut Flowers / Cultivation, Cultural Methods
Abstract For many cut flowers production and quality are enhanced by adding artificial assimilation light during periods of low light. For many seasonal flowers, the use of high intensity assimilation light is unprofitable or requires too high investment. Therefore the effect of day length extension with low intensity LED light (Philips production modules 94% red / 6% blue) was tested. In stock (Matthiola incana) the use of low intensity LED lighting accelerated harvest date by 10 to 20 days as light intensity increased from 5 to 20 μmol.m-2.s-1 measured at plant level. In snapdragon (Antirrhinum majus) the effect was less pronounced and visible only from 10 μmol.m-2.s-1. In Trachelium caeruleum the effect was even less and only visible at 20 μmol.m-2.s-1 in two of the three varieties used. The use of LED lighting during the daytime on the short day plant Ranunculus asiaticus had no effect on the time of harvest. In most crops leaf colour improved and leaf colour became darker as light intensity increased. The leaf colour of snowball (Viburnum opulus ‘Roseum’) also improved under red, blue, and 94% red/6% blue LED lights and under Retrofit lamps when compared to no artificial light. Moreover, leaves and stem below the inflorescence remained more compact and quality improved under red, blue, and red/blue light. Far-red LED light gave the opposite effect with lighter leaf colour, increased stem elongation and smaller and more pointed leaves.
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