Staff Publications

Staff Publications

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

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    We will mail you new results for this query: keywords==artificial light
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Nocturnal hunting by Eleonoras Falcons Falco eleonorae on their breeding and non-breeding grounds
Buij, Ralph ; Gschweng, Marion - \ 2017
Acta Ornithologica 52 (2017)1. - ISSN 0001-6454 - p. 35 - 49.
artificial light - Eleonora's Falcon - light pollution - migratory birds - moonlight - night-time hunting - raptors
We report on nocturnal hunting by Eleonora's Falcons in their breeding range in the Mediterranean region and in their non-breeding range in Madagascar. Hunting activity of Eleonora's Falcons near floodlights during the breeding season in western Morocco peaked 30-60 min after sunset, but continued into the early morning. Hunting activity and prey capture rates near floodlights were highest during nights with little moonlight or overcast conditions. Fifty-one percent of 73 group capture attempts were successful. Of the migratory prey species identified at the Moroccan study site (26 species), 73% belonged to species mainly migrating at night, whereas 57% of all migratory bird prey species of Eleonora's Falcon reported to date (122 species) migrate predominantly at night; suggesting that hunting near artificial light may increase the proportion of nocturnal migrant species in the diet of falcons. Sylvia and Acrocephalus were the most commonly recorded genera among prey caught after dark. Our direct observations and analysis of satellite transmitter data indicated that Eleonora's Falcons also hunted away from artificial light in Morocco, Italy, and frequently so in Madagascar. Flight activity was detected in 18% of 342 night-time locations of seven satellitetagged Eleonora's Falcons in Madagascar, at an average moon illumination of 60%. We conclude that nocturnal hunting by Eleonora's Falcons is more common than previously assumed and occurs preferably, but not exclusively, at above-average moon illumination on wintering grounds or near artificial lights during the breeding period.
Vervolgonderzoek emissiearme Lisianthus
Raaphorst, Marcel ; Eveleens, Barbara ; Burg, Rick van der; Schuddebeurs, Lisanne - \ 2017
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1440) - 30
kasgewassen - kassen - glastuinbouw - snijbloemen - emissiereductie - voedingsstoffen - gewasbescherming - kooldioxide - substraten - cultuur zonder grond - fusarium - bodemschimmels - kunstmatige verlichting - kunstlicht - greenhouse crops - greenhouses - greenhouse horticulture - cut flowers - emission reduction - nutrients - plant protection - carbon dioxide - substrates - soilless culture - soil fungi - artificial lighting - artificial light
Lisianthus growers look for methods to minimise the emission of nutrients, crop protection chemicals and CO2. In 2014 and 2015, nine crops with Lisianthus have been tested at the Delphy Improvement Centre. This report describes the four trials that have been carried out in the extended research in 2016. With this extension, a distinction was made between different substrates and intensities of assimilation lighting. In addition to knowledge about light use efficiency, water use, heat use, substrate differences and growth development, these extra crop cycles have brought to light that growing Lisianthus on substrate gives a less resilient plant against soil fungi than was experienced during the first crop cycles.
Systeemstap naar minimaal energieverbruik Alstroemeria : metingen op praktijkbedrijven en een energiezuinige teeltconcept
Garcia Victoria, N. ; Zwart, Feije de; Weel, Peter van; Steenhuizen, Johan ; Groot, Marco de - \ 2017
Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport GTB 1372) - 66
kasgewassen - glastuinbouw - kastechniek - kassen - alstroemeria - energiebehoeften - energiebesparing - verwarming - aanvullend licht - kunstlicht - simulatiemodellen - isolatie (insulation) - evaporatie - greenhouse crops - greenhouse horticulture - greenhouse technology - greenhouses - energy requirements - energy saving - heating - supplementary light - artificial light - simulation models - insulation - evaporation
Alstroemeria cultivation in The Netherlands requires energy for heating, supplementary light and root cooling. For the program “Greenhouse as Source of Energy” we calculated to which extent the energy demand for growing this crop can be reduced with existing energy saving innovations. Some innovations were tested in practice, others were calculated by means of the greenhouse climate simulation model Kaspro. Results showed that it is possible to save up to 34% energy for heating compared to the reference situation. 40% energy can be saved on electricity for supplementary light and root cooling. However, this strategy leads to a reduced amount of PAR-light in the winter, and 4% less flowers in comparison with the reference. The greatest impact can be achieved by increasing the insulation of the greenhouse by using double screens, reducing the evaporation from the soil, improving the crop hygiene to avoid extra evaporation from crop debris and reduce pest pressure, and implementing controlled dehumidification of the greenhouse air.
Open normen licht bij het bedrijfsmatig houden van gezelschapsdieren : praktische handvatten voor de controle op het voldoen aan ethologische en fysiologische behoeften van honden en konijnen
Ruis, Marko A.W. ; Borg, Joanne A.M. van der - \ 2017
Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 981) - 42
honden - konijnen - licht - kunstlicht - dierenwelzijn - dierhouderij - gezelschapsdieren - diergedrag - huisvesting, dieren - diergezondheid - dogs - rabbits - light - artificial light - animal welfare - animal husbandry - pets - animal behaviour - animal housing - animal health
This report describes the development of practical tools for inspectors to monitor compliance with the target welfare regulations with regard to provison of light for dogs and rabbits that are kept and sold commercially. On the basis of a literature study on the influence of light on the welfare and functioning of dogs and rabbits, and in the context of the situation in practice, tools were developed to supervise and advice in a systematic way. By this the inspector can make an informed assessment about whether or not enforcing rules on the provision of light.
Teelt Gerbera in Balans : de invloed van lichtsom, etmaaltemperatuur en daglengte op productie, energiegebruik en plantbalans
Garcia Victoria, Nieves ; Gelder, Arie de; Kempkes, Frank ; Dings, Eugenie - \ 2017
Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport GTB 1417) - 102
glastuinbouw - kasgewassen - kassen - gerbera - energiegebruik - kooldioxide - kunstlicht - gewaskwaliteit - productie - greenhouse horticulture - greenhouse crops - greenhouses - energy consumption - carbon dioxide - artificial light - crop quality - production
“Gerbera: Growing in Balance” was a research project to support the reduction of energy and CO2 consumption in the cultivation of Gerbera. The varieties Pre-Semmy, Rich, Whisper and Suri were grown in three glasshouses with different treatments: “Cool Cultivation” (15°C temperature; 90 μmol light, day length 13 hour in winter); “Practice” (temperature depending on day light integral, 100 μmol/m2s light, day length 11.5 hours) and “Light Dependent” (temperature depending sharply on day light integral, 90 μmol/m2s light, day length 13 hours in winter). The day light integral was kept equal in all treatments, regardless the difference in light intensity and day length in the winter. For flower quality and energy use “Cool Cultivation” was the best treatment, but required the most kg / m² of CO2. Whisper and Suri produced more flowers / m2 in the treatment “Light Dependent” but flower weights were low. Pre-Semmy and Rich gave more flowers in the treatment “Practice”, but spalkes were weak in May and June. The 13 hour day length in winter was not detrimental to production or quality. Light sum, day length and daily temperature are the three buttons to control the plant balance for optimum production and quality. The project was Funded by the Program “Greenhouse as Energy Source” (Ministry of Economic Affairs and LTO Glaskracht) and the Knowledge Cooperative Gerbera.
Plant reageert op korte en lange termijn verschillend op lichtkleur : onderscheid effecten fotosynthese en fotomorfogenese
Ieperen, W. van; Heuvelink, E. ; Kierkels, T. - \ 2016
Onder Glas 13 (2016)10. - p. 15 - 17.
kunstlicht - fotosynthese - plantenontwikkeling - fotomorfogenese - proefopzet - fotosynthetische actieve straling - belichting - glastuinbouw - artificial light - photosynthesis - plant development - photomorphogenesis - experimental design - photosynthetically active radiation - illumination - greenhouse horticulture
De inzichten in het effect van lichtkleuren op fotosynthese, vorm en ontwikkeling groeien gestaag. Je zou dan graag willen dat het om simpele relaties gaat, bijvoorbeeld ‘blauw licht opent huidmondjes’. Zo ligt het echter vaak niet. Effecten op korte en lange termijn zijn vaak verschillend en het gaat altijd om de mix van kleuren.
LED’s zijn geschikt om snel dips en pieken in natuurlijk licht op te vangen
Gelder, Arie de - \ 2016
led lamps - roses - heat exchangers - heat - thermal radiation - light - artificial light - greenhouse horticulture
Energiebesparing met LED belichting in gerbera : resultaten van 1ste jaar LED onderzoek
García, Nieves ; Weerheim, Kees ; Helm, Frank van der; Kempkes, Frank ; Visser, Pieter de; Groot, Marco - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Report GTB 1389) - 66
gerbera - glastuinbouw - kasgewassen - kassen - kastechniek - teelt onder bescherming - energiebesparing - led lampen - kunstlicht - kunstmatige verlichting - licht - verlichting - greenhouse horticulture - greenhouse crops - greenhouses - greenhouse technology - protected cultivation - energy saving - led lamps - artificial light - artificial lighting - light - lighting
In the winter 2013-2014 Wageningen UR Greenhouse Horticulture conducted studies on energy saving opportunities in the cultivation of gerbera, CV Kimsey. The research was funded by the program Greenhouse as Energy Source from the Ministry of Economic Affairs and LTO Glaskracht. The contribution of LED lighting, LED interlighting, a lower intensity of the light installation, and light integration was investigated. An electricity savings of 45% was the target. By using LED lighting a 20% electricity savings are possible in exchange for a small production loss (2.3%) and some additional heat demand (9%). By installing 80 instead of 100 μmol light gerbera growers can save another 20% energy costing only 3.9% production without sacrificing quality. The targeted PAR sum for light integration was too high to contribute to electricity savings. The use of 20 μmol LED interlighting in combination with 60 μmol top light (LED or SON-T) resulted in significantly less production (9%) and lower flower quality: shorter and lighter, smaller diameter and a lower % of dry matter) than 80 μmol top light.
Duurzaamheid als leidraad voor roos : vervolg onderzoek Perfecte Roos: energiezuinig geteeld
Gelder, Arie de; Warmenhoven, Mary ; Knaap, Edwin van der; Burg, Rick van der - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1412) - 50
rozen - teelt onder bescherming - kasgewassen - glastuinbouw - duurzame landbouw - energiebesparing - elektriciteit - assimilatie - kunstlicht - kunstmatige verlichting - verlichting - koelen - meeldauw - geïntegreerde bestrijding - geïntegreerde plagenbestrijding - roses - protected cultivation - greenhouse crops - greenhouse horticulture - sustainable agriculture - energy saving - electricity - assimilation - artificial light - artificial lighting - lighting - cooling - mildews - integrated control - integrated pest management
The project Sustainable rose cultivation aimed to achieve a sustainable and energy efficient rose cultivation by a controlled use of assimilation lighting, an optimum use of the cooling and an integrated control strategy for mildew. The production came to 320 stems.m-2 average weight 54 grams. The branch length and bud size varied through the season. There was no saving on electricity. There was a significant saving on heat. The improvement of the energy efficiency was totally determined by the reduction of the heat consumption. The light utilization efficiency was 2:44 g.mol-¹ and increased compared to the previous year. Cooling and forced ventilation had a positive effect on the stem elongation in the autumn. The installation with forced ventilation from above combined with the screen had a favourable effect on the climate, especially in the humidity control under a largely (95-98%) closed screen. The payback period of the investment in airconditioning is within 3 years.
Plantmonitoring op basis van fotosynthese sensoren : ontwikkelen en testen van sensoren
Dieleman, Anja ; Bontsema, Jan ; Jalink, Henk ; Snel, Jan ; Kempkes, Frank ; Voogt, Jan ; Pot, Sander ; Elings, Anne ; Jalink, Vincent ; Meinen, Esther - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1405) - 86
teelt onder bescherming - glastuinbouw - kastechniek - sensors - fotosynthese - kooldioxide - energie - energiebesparing - verlichting - kunstlicht - kunstmatige verlichting - ventilatie - kunstmatige ventilatie - fluorescentie - tomaten - solanum lycopersicum - protected cultivation - greenhouse horticulture - greenhouse technology - photosynthesis - carbon dioxide - energy - energy saving - lighting - artificial light - artificial lighting - ventilation - artificial ventilation - fluorescence - tomatoes
The basic process for crop growth and production is photosynthesis. Measuring crop photosynthesis is therefore important to monitor the status of the crop and whether the greenhouse climate is set to the needs of the crop. In this project, two monitoring systems for crop photosynthesis were developed and tested. (1) The crop photosynthesis monitor is a soft sensor that can calculate the CO2 uptake of an entire crop. The basis for these calculations are the balance between CO2 supply and CO2 loss via ventilation and crop photosynthesis. By measuring the CO2 concentration and humidity inside and outside the greenhouse, the crop photosynthesis can be calculated. (2) The CropObserver is a fluorescence sensor that measures the light use efficiency of photosynthesis of a large crop area (3 x 3 m2). The crop receives light pulses from a laser in the top of the greenhouse, the sensor measures the fluorescence signal of the crop. Both sensors were tested in a tomato crop in 2014 with promising results. The sensors functioned without problems and delivered patterns of daily photosynthesis which matched the reference measurements reasonably well up to well.
Illuminating a bird’s world : effects of artificial light at night on avian ecology
Jong, Maaike de - \ 2016
University. Promotor(en): Marcel Visser, co-promotor(en): K. Spoelstra. - Wageningen : Wageningen University - ISBN 9789462578098 - 177 p.
birds - animal behaviour - animal ecology - illumination - artificial light - night - fitness - biological rhythms - vogels - diergedrag - dierecologie - belichting - kunstlicht - nacht - fitheid - biologische ritmen
Bosmuizen verlicht [door studenten / promovendi]
Sindram, Janneke - \ 2015
De Levende Natuur 116 (2015)2. - ISSN 0024-1520 - p. 71 - 72.
forest ecology - artificial light - fauna - mice - adverse effects - bosecologie - kunstlicht - muizen - nadelige gevolgen
Kunstlicht heeft op allerlei dieren invloed. Daar zijn veel voorbeelden van te verzinnen. Gecombineerd met het feit dat het in Europa 's nachts steeds lichter is geworden, mag de conclusie getrokken worden dat de natuur hier veel gevolgen van ondervindt. Nader onderzoek wordt verricht door Janneke Sandram, begeleid vanuit Wageningen Universiteit en NIOO.
Lichtspectrum als middel voor energiezuinige rozenteelt : praktijkproef bij Van der Arend Roses
Garcia Victoria, N. ; Pot, S. - \ 2015
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1368) - 68
teelt onder bescherming - glastuinbouw - rozen - kunstlicht - led lampen - lichtsterkte - productie - kwaliteit - energiebesparing - energy economics - protected cultivation - greenhouse horticulture - roses - artificial light - led lamps - light intensity - production - quality - energy saving
During the winter 2014-2015 a research was conducted at a commercial rose nursery to learn more about the influence of a special lamp light spectrum on the production and quality of the rose Avalanche. A “hybrid” lighting system was installed with 103 µmol /m2s PAR from High Pressure Sodium and from Valoya LED lamp G1 in two different intensities: 57 or 103 µmol /m2s PAR. Compared with the conventional installation of the company (191 micromol SON-T), the spectrum of the hybrid installation allowed, depending on the intensity of the added LED, a 7.2% to 9% higher light use efficiency (LUE) by the crop. This offers possibilities for energy saving, but therefore the energy efficiency of the lamps used (Valoya G1) needs to increase to an output of 1.7 µmol PAR per watt electric. Valoya is already working on this improvement. The performed plant measurements (SPAD, bud temperature, photosynthesis, leaf area, etc.) do not contribute to explain this positive effect. More research about the effects of light colour on the rose production is needed. Remaining questions are if other rose varieties react the same to the combined spectrum, if the crop can grow more compact in winter when there is more blue in the spectrum, and if a larger proportion of far-red light could make the flowers even heavier, with a larger flower bud. The research was funded by the program “Greenhouse as Energy Source” (Ministry of Economy and the Horticultural Product Board) and Valoya.
Efficiënt omgaan met elektriciteit bij chrysant : opties voor besparing
Raaphorst, M.G.M. ; Dueck, T.A. ; Kempkes, F.L.K. ; Veld, P. de; Corsten, R. - \ 2015
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1370) - 32
chrysanthemum - teelt onder bescherming - kasgewassen - sierteelt - elektriciteit - kunstlicht - kunstmatige verlichting - energiebesparing - led lampen - afdeklagen - reflectie - diffuus glas - snijbloemen - glastuinbouw - protected cultivation - greenhouse crops - ornamental horticulture - electricity - artificial light - artificial lighting - energy saving - led lamps - coatings - reflection - diffused glass - cut flowers - greenhouse horticulture
Trials have demonstrated that that the heat use for Chrysanthemum can be considerably reduced if the right measures are taken. If these reduction can also be realised with lighting, then we are well on the way to climateneutral Chrysanthemum cultivation. In order to identify energy saving measures with lighting, Wageningen UR Greenhouse Horticulture along with growers and DLV-Plant have calculated energy savings for the most promising measures. The most important measures also appear to entail a large investment, such as ARcoatings, diffused glass, LED lighting or a super-reflecting greenhouse structure. More accessible measures, such as soil reflection (for example, styromull), can also lead to a 5% lower electricity costs. In addition, there are many small measures that are expected to increase the energy efficiency. Examples are the stage-dependent lighting regime or an extended propagation. However, it is not yet known how large the effects of these measures are and if they are also economically viable
Stuurlicht in de Glastuinbouw : 1. Kansen voor energiebesparing?
Dueck, T.A. ; Hogewoning, S. ; Pot, S. ; Meinen, E. ; Trouwborst, G. ; Kempkes, F.L.K. - \ 2015
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1349) - 56
teelt onder bescherming - gewasproductie - gewasopbrengst - gewaskwaliteit - gewasfysiologie - kunstlicht - kunstmatige verlichting - plantenfysiologie - aanvullend licht - blauw licht - verrood licht - rood licht - phalaenopsis - kalanchoe - chrysanten - protected cultivation - crop production - crop yield - crop quality - crop physiology - artificial light - artificial lighting - plant physiology - supplementary light - blue light - far red light - red light - chrysanthemums
This report focusses on energy efficient steering light applications by energy efficient lighting systems, but especially with new possibilities to influence crop growth and production with the light spectrum. After an introduction of the physiological background and application of steering light, new applications for steering light in the future are described with respect to energy saving opportunities. Possible scenario’s for steering light are presented for phalaenopsis, chrysanthemum and kalanchoë.
Moths in illuminated nights : articificial night effects on moth ecology
Geffen, K.G. van - \ 2015
University. Promotor(en): Frank Berendse, co-promotor(en): Elmar Veenendaal; Roy van Grunsven. - Wageningen : Wageningen University - ISBN 9789462572300 - 116
lepidoptera - kunstlicht - nacht - belichting - dierecologie - effecten - geometridae - diergedrag - artificial light - night - illumination - animal ecology - effects - animal behaviour
Almost all terrestrial species on earth have evolved to be active in a certain part of the day, and as a result are adapted to certain light conditions. Diurnal species are active under high light intensities (the period known as the photophase, i.e. daytime), nocturnal species are active in low light intensities (the period known as the scotophase, i.e. night), and crepuscular species are in between, active in twilight (i.e. dusk and dawn). During the course of evolution, light intensity has been a very reliable cue for the on- and offset of activity of all these species, but recently, the night is no longer dark per definition. Mankind illuminates the night with artificial light sources, which has led to world-wide large-scale alterations of night-scapes. Levels of light pollution continuously rise, currently with approximately 6% per year on average
Het effect van licht op bio-aardappel vergroening in de retail
Pereira da Silva, F.I.D.G. ; Otma, E.C. - \ 2015
Wageningen : Wageningen UR & Biobased Research (Rapport / Wageningen UR Food & Biobased Research 1528) - ISBN 9789462573635 - 26
consumptieaardappelen - achteruitgang (deterioration) - vergroening - chlorofyl - kunstlicht - supermarkten - biologische voedingsmiddelen - aardappelen - voedselkwaliteit - table potatoes - deterioration - greening - chlorophyll - artificial light - supermarkets - organic foods - potatoes - food quality
Uit peilingen van de Nederlandse Aardappel Organisatie en andere, blijkt dat er nog steeds kwaliteitsgebreken vast te stellen zijn bij de biologische aardappels in het schap. Vergroening lijkt één van de belangrijkste aspecten van de kwaliteitsgebreken te zijn. Het doel van dit projectonderdeel is daarom om te onderzoeken welk type licht in de supermarkt leidt tot de beste resultaten om vergroening van bio-aardappels in het schap tegen te gaan.
Zo bespaart u elektriciteit met stalverlichting
Winkel, A. ; Ellen, H.H. - \ 2014
stallen - verlichting - elektriciteit - kunstlicht - energiebesparing - huisvesting, dieren - rundveehouderij - stalls - lighting - electricity - artificial light - energy saving - animal housing - cattle husbandry
Poster. Hoe kan elektriciteitsverbruik van stalverlichting worden beperkt?
Besparing op elektriciteit met LED's 20% en hybride-belichting 6% : Teelt onder hybridebelichting nog niet rendabel
Arkesteijn, M. ; Meinen, E. ; Dueck, T.A. - \ 2014
Onder Glas 11 (2014)8. - p. 28 - 29.
glastuinbouw - belichting - led lampen - kunstlicht - milieubeheersing - effecten - energiegebruik - energiebesparing - proeven - potplanten - greenhouse horticulture - illumination - led lamps - artificial light - environmental control - effects - energy consumption - energy saving - trials - pot plants
Afgelopen najaar is gekeken naar de mogelijkheid om in de chrysantenteelt energie te besparen. Doelstelling daarbij was om door het gebruik van LED-lampen het elektriciteitsverbruik te verminderen met behoud van productie en kwaliteit. In drie aparte proefkassen is bij veertien verschillende rassen gekeken naar de resultaten onder 100% SON-T, een hybride-belichtingssysteem (half SON-T en half LED’s) en 100% LEDbelichting.
Stuurlicht bij anjer - Consultancy: Vergelijking van LED lampen en gloeilampen
Helm, F.P.M. van der - \ 2013
Bleiswijk : Wageningen UR Glastuinbouw (Rapporten GTB 1216) - 32
glastuinbouw - teelt onder bescherming - belichting - lampen - kunstlicht - proeven - energiegebruik - besluitvorming - anjers - dianthus caryophyllus - greenhouse horticulture - protected cultivation - illumination - lamps - artificial light - trials - energy consumption - decision making - carnations
Als gevolg van nieuwe wetgeving zullen gloeilampen vervangen moeten worden. De kwekers moeten nu kiezen tussen de alternatieven; LED lampen of spaarlampen. In een onderzoek in de praktijk in 2012 zijn op twee bedrijven proeven aangelegd. Op 1 bedrijf bij 2 rassen en op een ander bedrijf met 2 intensiteiten. Door gebruik van Led lampen kan energiebesparing kan bereikt worden. Het verschil is 150 W voor een gloeilamp ten opzichte van 18 W per LED lamp (Philips), terwijl er niet (veel) meer lampen nodig zijn.
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