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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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.
Vergelijking tussen gangbaar en emissieloos teeltsysteem : waterefficiënte Emissieloze Kas
Os, Erik van; Ruijven, Jim van; Janse, Jan ; Beerling, Ellen ; Staaij, Marieke van der; Kaarsemaker, Ruud - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1406) - 62
paprika's - capsicum annuum - teelt onder bescherming - kasgewassen - glasgroenten - glastuinbouw - emissiereductie - emissie - stikstof - fosfaat - voedingsstoffen - pesticiden - sweet peppers - protected cultivation - greenhouse crops - greenhouse vegetables - greenhouse horticulture - emission reduction - emission - nitrogen - phosphate - nutrients - pesticides
Stricter legislation forces growers to decrease discharge of water with nitrogen, phosphate and plant protection products. A demonstration was set-up to compare emission free cultivation with a traditional growing method. Goal was to achieve a comparable yield and quality. Essential differences were disinfection of rainwater, ring pipes for drip irrigation, no discharge of first drain in cultivation, a filter without rinsing and weekly analysis of the nutrient solution. It appeared that production and quality were similar as were other climate parameters. Water use was higher in emission free crop, discharge was 4% in traditional crop realizing 152 kg N discharge per ha per year, which was more than the allowed 133 kg. Specific end cultivation strategy is useful to decrease nitrogen and phosphate stored in slabs and stock containers.
Consultancy genereren basiskennis fotosynthese aardbei
Kaiser, E. ; Janse, J. - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1411) - 22
aardbeien - fragaria ananassa - teelt onder bescherming - kasgewassen - glastuinbouw - fotosynthese - energiebesparing - licht - kooldioxide - strawberries - protected cultivation - greenhouse crops - greenhouse horticulture - photosynthesis - energy saving - light - carbon dioxide
To save electricity and CO2 during strawberry production, more knowledge about the photosynthesis of greenhouse-grown strawberry plants is necessary. This was tackled by measuring light- and CO2-dependent photosynthesis responses and by conducting a literature study in which several parameters of leaf-level photosynthesis were compared. From measurements conducted between middle of March and middle of May 2016 it was concluded that the rate of photosynthesis and electron transport was comparable between young and old leaves, while stomatal conductance in young leaves was always higher. Light- and CO2- saturated photosynthesis rates were higher in older leaves. Furthermore, a decrease of photosynthesis rates was visible in April, which may have been caused by acclimation of leaf biochemistry to elevated CO2 concentrations in the greenhouse. Conclusions from the literature study were that light saturation was reached at ~1000 μmol m-2 s-1 and that CO2 saturation was reached at ~1100 μmol mol-1. Average photosynthesis rates at these conditions were 18 and 35 μmol m-2 s-1, respectively. The average quantum yield of photosynthesis was ~0.06 μmol CO2 μmol-1 PAR, which is comparable to other, fast growing greenhouse crops (e.g. cucumber, tomato, sweet pepper). Large knowledge gaps about the course of photosynthesis during complete growing seasons remain.
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.
Emissiearme lisianthus : proef met 9 teelten op substraat bij het Improvement Centre
Raaphorst, M.G.M. ; Eveleens-Clark, B.A. ; Burg, R. van der; Grootscholten, M. - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1401) - 42 p.
bloementeelt - snijbloemen - teelt onder bescherming - kasgewassen - glastuinbouw - kasproeven - duurzame landbouw - substraten - kokosvezel - klei - floriculture - cut flowers - protected cultivation - greenhouse crops - greenhouse horticulture - greenhouse experiments - sustainable agriculture - substrates - coir - clay
Nine crops with lisianthus have been carried out on coir in cloth gutters, five of which were also on expanded clay pellets. In addition to growing on a closed system, the use of energy and plant protection products is kept limited. The crops have shown a reasonable production, although not as high as in practice. This difference may be caused by both the frugal exposure to lighting as the unfamiliarity with growing on substrate. The crops on coir have shown a better production than the crops on expanded clay pellets.
Telen met gestuurde vochtafvoer : komkommers in de Venlow Energy kas
Gelder, A. de - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1408)
teelt onder bescherming - kasgewassen - glasgroenten - glastuinbouw - dubbele beglazing - komkommers - cucumis sativus - evaporatie - ventilatie - vochtigheid - protected cultivation - greenhouse crops - greenhouse vegetables - greenhouse horticulture - double glazing - cucumbers - evaporation - ventilation - humidity
Funded by Kas als Energiebron, Wageningen UR Greenhouse Horticulture conducted an experiment witth cucumber in the Venlow Energy greenhouse with a high-wire system. The objective was to achieve a minimal evaporation during cultivation under double glazing and a film screen. In the night the evaporation fell to 15-25 g. m-2.hour-1. This was enough to grow cucumbers without deficiency symptoms. Only in March, some degree of “bolblad” occurred, but after a few sunny days the crop well recovered. The film screen was kept closed until 2 hours after sunset and one hour before sundown closed. This provided no problems for cultivation. In the night the humidity could rise above 95% without Mycosphearella problems. For the new cultivation strategy this means if other factors such as horizontal uniformity of the climate are good that cultivation in high humidity and with minimal ventilation is possible. For the Venlow Energy greenhouse ventilation rate was 0.37 and this delivers in winter conditions a sufficient degree of natural ventilation and moisture management.
Verhoging van energie-efficiency bij intensieve glastuinbouw productiesystemen : ontwikkeling van high-tech sensorsystemen voor monitoring en besturing van energiezuinige kassen: Fibre Bragg glasvezelsensoren
Balendonck, J. ; Janssen, H.J.J. ; Zwart, H.F. de; Schriek, L. ; Toet, P. ; Bezemer, R.A. ; Ruijs, M.N.A. - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1392) - 78 p.
teelt onder bescherming - kasgewassen - kassen - intensieve productie - energiebesparing - sensors - temperatuur - relatieve vochtigheid - protected cultivation - greenhouse crops - greenhouses - intensive production - energy saving - temperature - relative humidity
Wageningen UR Greenhouse Horticulture and TNO conducted a study on the application of Fibre Bragg optic sensors to measure temperature and relative humidity in greenhouses at high spatial density. Sensors, incorporated in an experimental enclosure, were evaluated under practical conditions in a greenhouse at Bleiswijk (NL). Their performance appeared to be similar to that of existing wireless electronic sensors. In order to save energy when using their heating, growers may so obtain relative humidity at higher spatial density and grow at a higher average humidity level. Sensors indicate at an early stage if there is condensation and consequently a higher risk on diseases somewhere in the greenhouse. Rule of thumb is that every percent increase in the humidity will yield about 3.5% of energy or 1 m³ natural gas equivalents. In addition to energy saving, investing in a distributed monitoring network also has an economic advantage. Another advantage is that fiber-optic sensor networks can be extended to larger areas and with other sensor types at little more costs. However, little research and no practical experience is gained with fiber optic sensors in greenhouses. More research is still needed in order to arrive at a system ready for practice.
Ontwikkeling van toepassingen met plasmawater in de glastuinbouw
Quaedvlieg, William ; Hofland-Zijlstra, J.D. ; Hollinger, T.C. ; Noordam, Marianne ; Slootweg, G. ; Broek, R.C.F.M. van den; Kolk, Jan Paul van der; Ruijven, J.P.M. van; Stijger, I. - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1391) - 68 p.
teelt onder bescherming - gewasbescherming - biociden - desinfectie - irrigatiewater - radicalen - bevruchtingsvermogen - protected cultivation - plant protection - biocides - disinfection - irrigation water - radicals - fertilizing ability
In collaboration with Vitalfluid, TU Eindhoven, FloraHolland, Bactimm, Alewijnse and Medical faculty of UMC Radboud Wageningen UR Greenhouse Horticulture studied horticultural application for the use of plasma activated water. This research was funded by the GO programm Oost Nederland, the European Fund for Regional Development (EFRO) and Top sector Horticulture & Propagation materials. By using a specialized plasma reactor, an indirect air dielectric barrier discharge in close proximity to water can create an acidified, nitrogen-oxide containing solution called plasma-activated water (PAW). Plasma water is tested for properties as a biocidal product, plant protection treatment and as a fertilizer in horticultural applications. Mild plasma water with a short production time (15 min) can effectively control bacteria and meet the biocidal product legislation. Strong plasma water with a longer production time (45 min) is necessary for controlling molds as Fusarium, Botrytis and powdery mildew. The tomato mosaic virus can be reduced with strong plasma up to 80%. The crop treatments showed no damage on young gerbera plants, lettuce and tomato plants. Application of plasma water through the irrigation system to promote plant growth is not promising, because nitrogen supply is in general not limited. Application as seed disinfection is possible with low concentrations of plasma water.
Recirculatie bij snij-amaryllis (Hippeastrum) in drie teeltjaren (2013-2015) : Behoud plantgezondheid en voorkomen groeiremming bij hergebruik drainwater
Kromwijk, J.A.M. ; Burg, R. van der; Nijs, L. ; Overkleeft, J. ; Eveleens-Clark, B.A. ; Blok, C. ; Os, E.A. van; Baar, P.H. van; Grootscholten, M. ; Woets, F. - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1398) - 88 p.
amaryllis - glastuinbouw - kasgewassen - kasproeven - teelt onder bescherming - emissie - hergebruik van water - afvalwaterbehandeling - afvalwater - recirculatiesystemen - lycorine - stikstof - voedingsstoffen - kunstmeststoffen - greenhouse horticulture - greenhouse crops - greenhouse experiments - protected cultivation - emission - water reuse - waste water treatment - waste water - recirculating systems - nitrogen - nutrients - fertilizers
In the Netherlands most crops grown in greenhouses reuse drain water. However, in the cultivation of amaryllis
cut flowers (Hippeastrum) little drainage water is being reused so far because of strong suspicions of inhibitory
substances in the drainage water. To reduce the emission of nutrients to the environment an experiment was
started on request of the amaryllis growers. In a greenhouse experiment drainage water of amaryllis was treated
with advanced oxidation and reused. This was compared with the reuse of drainage water treated with an UV
disinfector and a control treatment without the reuse of drainage water. In three years of cultivation, there was
no difference in production and no adverse effects were seen in crop growth. This research was funded by the
Dutch amaryllis growers, the ‘Topsector Tuinbouw en Uitgangsmaterialen’, the Product Board for Horticulture, the
project ‘Samenwerken aan Vaardigheden’ and Koppert.
Guidelines for experimental practice in organic greenhouse horticulture
Koller, Martin ; Rayns, Francis ; Cubison, Stella ; Schmutz, U. ; Messelink, G.J. ; Voogt, W. - \ 2016
[Netherlands] : BioGreenhouse - ISBN 9789462575349 - 154 p.
greenhouse horticulture - organic farming - guidelines - protected cultivation - greenhouse crops - cultural methods - greenhouse vegetables - trials - glastuinbouw - biologische landbouw - richtlijnen (guidelines) - teelt onder bescherming - kasgewassen - cultuurmethoden - glasgroenten - proeven
The aim of this handbook of experimental guidelines is to help conduct experiments for organic horticulture in greenhouses throughout Europe. It considers vegetables, fruit and ornamental production. Using standardised research procedures for experiments will aid a comparison of results and dissemination of knowledge. The editors have tried to incorporate as many climatic zones, countries and crops as possible in order to represent a wide area of Europe although some smaller crops or certain specific climates could not be included.
Jaarrondteelt op water van slatypen in een cabrio tunnelkas met led-belichting
Janse, J. ; Vermeulen, T. ; Weel, P.A. van - \ 2016
Wageningen UR - 1 p.
tuinbouw - tunnels - jaarrondproductie - slasoorten - teelt onder bescherming - hydrocultuur - teeltsystemen - led lampen - kasproeven - gewaskwaliteit - horticulture - all-year-round production - lettuces - protected cultivation - hydroponics - cropping systems - led lamps - greenhouse experiments - crop quality
Doelstelling van dit project is het verbeteren van teeltzekerheid en opbrengst van met name ijsbergsla, het hele jaar rond en het verbeteren wortelkwaliteit en plantweerbaarheid bij teelt op water. Poster van het PlantgezondheidEvent 2016.
Scenarios for exposure of aquatic organisms to plant protection products in the Netherlands : soilless cultivations in greenhouses
Linden, A.M.A. van der; Os, E.A. van; Wipfler, E.L. ; Cornelese, A.A. ; Ludeking, Daniel ; Vermeulen, T. - \ 2015
Bilthoven : RIVM (RIVM report 2015-0128) - 78
greenhouse horticulture - pesticides - water pollution - authorisation of pesticides - leaching - risk assessment - protected cultivation - emission - surface water - glastuinbouw - pesticiden - waterverontreiniging - toelating van bestrijdingsmiddelen - uitspoelen - risicoschatting - teelt onder bescherming - emissie - oppervlaktewater
Als door het gebruik van gewasbeschermingsmiddelen in kassen restanten van deze middelen in het nabijgelegen oppervlaktewater terechtkomen, kan dat het waterleven aantasten. Hiermee wordt te weinig rekening gehouden bij de huidige risicobeoordeling van het gebruik van een gewasbeschermingsmiddel voor gewassen die in kassen op substraat, bijvoorbeeld steenwol, worden geteeld. Daarom zijn voor deze toepassingen nieuwe methoden voor de risicobeoordeling ontwikkeld waarin dat wel is ingecalculeerd.
Verse groenten produceren in de woestijn
Campen, J.B. - \ 2015
Kas techniek 2015 (2015)oktober. - p. 16 - 18.
tuinbouw - glastuinbouw - kastechniek - groenteteelt - midden-oosten - onderzoeksprojecten - voedselproductie - agrarische productiesystemen - teelt onder bescherming - waterbeschikbaarheid - klimaat - horticulture - greenhouse horticulture - greenhouse technology - vegetable growing - middle east - research projects - food production - agricultural production systems - protected cultivation - water availability - climate
Voedselzekerheid en voedselveiligheid staan hoog op de agenda in het Midden-Oosten sinds de voedselcrisis in 2007-2008. Voedsel wordt voor een groot deel geïmporteerd uit omliggende landen, maar ook uit Nederland. Vooral in de zomermaanden zijn de prijzen van versproducten in deze landen hoog, omdat er dan weinig in de regio zelf wordt geproduceerd. Vanwege de hoge prijzen en de lage kwaliteit van producten uit omliggende landen zijn er verschillende programma’s gestart om het productiesysteem te verbeteren. Hierbij is ook veel aandacht voor waterbesparing, aangezien water een zeer schaars product is in een groot deel van deze regio.
Natriumgevoeligheid en recirculatie bij Cymbidium. Tussenrapport na 1e teeltjaar : Behoud plantgezondheid en voorkomen groeiremming bij hergebruik drainwater
Kromwijk, J.A.M. ; Voogt, W. - \ 2015
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1371) - 24
teelt onder bescherming - glastuinbouw - cymbidium - recirculatiesystemen - emissie - natrium - drainagewater - groei - kwaliteit - gewaskwaliteit - protected cultivation - greenhouse horticulture - recirculating systems - emission - sodium - drainage water - growth - quality - crop quality
In the Netherlands, the government and horticultural industry have agreed to lower the emission of nutrients to the environment. Until recently no drain water was reused in the cultivation of Cymbidium orchids as growers were allowed to discharge the drain water when a sodium level of more than 0 mmol/l was reached. As reusing drain water is a new phenomenon for Cymbidium, growers are now faced with a lack of knowledge on the effects of drain water reuse. Therefore a trial was started to investigate the effect of sodium accumulation on crop growth and flowering in two varieties of Cymbidium. Different sodium concentrations are given while maintaining the EC at 0.8. These sodium treatments have a lower “nutritional EC” than the control treatment without sodium. As of February 2015 unusual symptoms in the leaves emerged at the two highest levels of sodium resulting in dead leaf tips / leaves. This is potassium deficiency, induced by the lower potassium concentration in the nutritional solution and by inhibition of the potassium uptake by a high sodium concentration. In the first year of cultivation, sodium accumulation had no effect on production as the flower stalks were already induced before the start of the treatments. Cymbidium is a perennial crop in which negative effects on production and quality take a long time to become visible, so the experiment will be continued into a second year of cultivation. This research is funded by the Cymbidium growers in the Netherlands, Product Board for Horticulture and Top Sector Horticulture and Propagation Materials.
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.
Een perfecte roos energiezuinig geteelt
Gelder, A. de; Warmenhoven, M.G. ; Knaap, E. van der; Baar, P.H. van; Grootscholten, M. ; Aelst, N. - \ 2015
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1369) - 96
rozen - teelt onder bescherming - glastuinbouw - gewaskwaliteit - energiebesparing - kooldioxide - verwarming - diffuus glas - koelen - led lampen - ventilatie - meeldauw - botrytis - vaasleven - economische analyse - bloementeelt - roses - protected cultivation - greenhouse horticulture - crop quality - energy saving - carbon dioxide - heating - diffused glass - cooling - led lamps - ventilation - mildews - vase life - economic analysis - floriculture
Within a greenhouse equipped with diffuse glass, cooling from above the crop, LED interlighting, active ventilation with tubes below the gutters and three screens an experiment was conducted to produce good quality roses in an energy effi cient way. After two years research the roses cv Red Naomi! fulfi lled the desired quality marks. This was achieved with less energy for heating compared to a defi ned virtual reference compartment. Combined with heat harvested during cooling there was no need for additional heating energy. The crop management was a key factor in the way to quality. For control of mildew and Botrytis it was necessary to keep the air humidity below 85 %. This is hard to achieve in an energy saving cropping system.
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
HNT Gerbera vraagt om meer inzicht in luchtstromen en vochtafvoer in de kas : Telers zelf actief in onderzoek en ontwikkeling
Rodenburg, J. ; Weel, P.A. van - \ 2015
Onder Glas 12 (2015)4. - p. 42 - 43.
glastuinbouw - snijbloemen - teeltsystemen - teelt onder bescherming - luchtstroming - ontvochtiging - vergelijkend onderzoek - proeven - transpiratie - greenhouse horticulture - cut flowers - cropping systems - protected cultivation - air flow - dehumidification - comparative research - trials - transpiration
Volgens innovatiemakelaar Stefan Persoon verdient het gerberavak een compliment. Als geen ander zijn de telers zelf actief in onderzoek en ontwikkeling. En met de resultaten komen ze aantoonbaar verder. “We hebben samen inderdaad veel bereikt”, meent ook Mathieu van Holstein, directeur van Holstein Flowers. “Op het gebied van belichting, verduistering en natuurlijk Het Nieuwe Telen. We weten nu bijvoorbeeld dat we energiezuiniger kunnen telen met behoud van kwaliteit.”
Beheersing emissie grondgebonden kasteelten
Voogt, W. ; Balendonck, J. ; Janse, J. ; Swinkels, G.L.A.M. ; Winkel, A. van - \ 2015
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1363) - 38
teelt onder bescherming - snijbloemen - emissie - beslissingsondersteunende systemen - biologische landbouw - irrigatie - lysimeters - sensors - water - voedingsstoffenbalans - voedingsstoffen - optimalisatie - protected cultivation - cut flowers - emission - decision support systems - organic farming - irrigation - nutrient balance - nutrients - optimization
To make growers to be in control of the emission, a decision support system is developed for irrigation in soil grown crops. In 2013-2014 the implementation was continued and several greenhouse crops were monitored. As was found earlier, the organic greenhouse growers are able to control irrigation in a way that emission is reduced to a minimum. The results obtained at (conventional) flower growers show sometimes high emission of nitrogen. This is due at one hand to high irrigation surpluses but also to high fertilisation of nitrogen. Better tuning of the water- and nitrogen supply to the crop demand is necessary. For these stapes growers need better soil-moisture sensors.
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