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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    The environment in Ghanaian greenhouses
    Elings, Anne ; Warmenhoven, Mary - \ 2020
    Bleiswijk : Wageningen University & Research, BU Greenhouse Horticulture (Report / Stichting Wageningen Research, Wageningen Plant Research, Business Unit Greenhouse Horticulture WPR-928) - 30
    The project “Safe and accessible greenhouse production of (fruit) vegetables in Ghana” (“Fresh Green Ghana”), among others, intends to achieve improvement and enlargement of protected horticulture through data sharing and technology improvement, including the post-harvest chain, in collaboration with growers. This can contribute to greater availability of fresh (fruit) vegetables for the urban poor in Ghana. Data on environmental conditions outside and inside four greenhouses in southern Ghana were obtained from January 2018 – August 2019. The most important environmental character is temperature. Outdoor temperatures vary between 21 and 35oC, and indoor temperatures can be up to 10oC higher. Such high temperatures are have negative effects on crop growth and production. Influencing factors are altitude, size and orientation of the greenhouse, use of screens, and wind speed and direction. A number of management options to reduce the temperature increase are discussed. With this quantitative information, greenhouse designers and constructors and growers are better informed to make the right decisions.---Het project “Safe and accessible greenhouse production of (fruit) vegetables in Ghana” (“Fresh Green Ghana”) wil onder anderen bijdragen aan de verbetering en verbreding van de beschermde tuinbouw door in samenwerking met tuinders gegevens te delen en technologie te verbeteren, inclusief de na-oogst keten. Dit kan bijdragen aan een grotere beschikbaarheid van verse (vrucht)groenten voor de arme stedelijke bevolking in Ghana. Gegevens van groeiomstandigheden binnen en buiten vier kassen in zuidelijk Ghana werden van januari 2018 tot en met augustus 2019 verzameld. De belangrijkste milieueigenschap is temperatuur. De temperatuur van de buitenlucht varieert tussen 21 en 35oC, en de binnentemperatuur kan tot 10oC hoger liggen. Zulke hoge temperaturen werken negatief op groei en productie van het gewas. De kastemperatuur wordt beïnvloed door hoogte, kasformaat en -oriëntatie, het gebruik van schermen en windsnelheid en -richting. Een aantal opties om de kastemperatuur te beheersen worden besproken. Met deze kwantitatieve informatie kunnen kasontwerpers en -bouwers en tuinders betere beslissingen nemen.
    CO2 op zoek naar de grens : Literatuur- en modellenstudie
    Visser, Pieter de; Gelder, Arie de; Warmenhoven, Mary ; Petropoulou, Anna - \ 2019
    Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport / Stichting Wageningen Research, Wageningen Plant Research, Business unit Glastuinbouw WPR-909) - 46
    The most recent literature on CO2 use by plants was examined. Already much is known on photosynthesis and CO2 assimilation. Genetic modification was shown to boost photosynthesis by 20%. Naturally, the plant adapts to CO2 concentration. Also in sweet pepper and tomato crops adaptation to lower CO2 levels were observed, yet the extend and the rate of adaptation is hard to predict. The gathered knowledge was used to simulate crop growth at various supply strategies of CO2. The goal was to reduce CO2 dosing while maintaining an economically viable tomato yield. Simulations showed that under normal light conditions the crop can maximally assimilate 15 kg CO2 m-2, while conventional CO2 dosage is more than triple resulting in much loss to the air. Continuous applications of 50 kg CO2 ha-1 hr-1 led to a yield reduction of 20% relative to 200 kg CO2. Further model wise optimization of the CO2 dosing resulted in much lower CO2 losses while reducing fruit yield with only 2%. In this scenario only 13 kg CO2 m-2 j-1 was supplied, at 450 ppm during roof opening of >10%. A further optimization was enabled by allowing a 2° higher ventilation temperature. The results give options for a much lower CO2 dosage in practice than currently used.
    Het Nieuwe Gewas : sturen van de plantvorm voor verhoogde lichtbenutting
    Gelder, Arie de; Janse, Jan ; Warmenhoven, Mary - \ 2016
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1407) - 62
    tomaten - solanum lycopersicum - kasgewassen - glasgroenten - glastuinbouw - energiebesparing - plantenontwikkeling - gewasteelt - licht - tomatoes - solanum lycopersicum - greenhouse crops - greenhouse vegetables - greenhouse horticulture - energy saving - plant development - crop management - light
    Wageningen UR Greenhouse horticulture searched in the “The New Crop” project for the crop structure that best contributes to the goal of energy-efficient production and therefore energy saving, by removing 33, 44 or 55% of the leaves at a young stage. On October 10th 2014 the experiment started with topped plants of the tomato variety Brioso grafted on Maxifort. Dry matter production was lowest in the very open crop, however partitioning to the fruits was highest in that treatment. Therefore, this crop produced in the winter under assimilation lighting most. In summer, the standard treatment was the best and the production in this treatment was highest. The plants in the very open treatment were shorter and had smaller leaves than the plants of the standard treatment. This is might be due to a different red: far red ratio of light in the crop. Leaf picking at a young stage contributes to better distribution of assimilates to the fruits. This can be used as a crop management measure as the plant in winter develops too much leaves. The project was funded by the Dutch energy transition program “Kas als Energiebron”.
    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.
    Effect diffuus licht bij diverse gewassen
    Janse, Jan - \ 2015
    Tom Dueck, Frank Kempkes, Silke Hemming, Barbara Eveleens, Anja Dieleman, Filip van Noort, Nieves Garcia, Esther Meinen, Mary Warmenhoven, e.a.
    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 - botrytis - 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.
    Alstroemeriateelt kan energiezuiniger met LED
    Garcia Victoria, N. ; Helm, F.P.M. van der; Warmenhoven, M.G. - \ 2015
    Kasalsenergiebron.nl
    Forse energiebesparing in tomatenproef
    Dieleman, J.A. ; Janse, J. ; Gelder, A. de; Kempkes, F.L.K. ; Visser, P.H.B. de; Lagas, P. ; Meinen, E. ; Warmenhoven, M.G. ; Elings, A. - \ 2015
    Energiek2020
    Tomaten belichten met minder elektriciteit
    Dieleman, J.A. ; Janse, J. ; Gelder, A. de; Kempkes, F.L.K. ; Visser, P.H.B. de; Lagas, P. ; Meinen, E. ; Warmenhoven, M.G. ; Elings, A. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1338) - 76
    glastuinbouw - cultuurmethoden - tomaten - solanum lycopersicum - belichting - led lampen - energiegebruik - efficiëntie - elektriciteit - reductie - gewasproductie - greenhouse horticulture - cultural methods - tomatoes - solanum lycopersicum - illumination - led lamps - energy consumption - efficiency - electricity - reduction - crop production
    Over the last 10 years, the use of electricity for assimilation lighting has increased considerably. It is now an important part of the energy use of the horticultural sector. To reverse this trend, in the lighting season 2013/2014, we conducted a trial with the aim to reduce the electricity use in a lighted tomato crop by 35% while maintaining production levels. Two treatments were applied: (1) Reference cultivation: clear glass and lighting by 50% HPS lamps and 50% LED intermittent lighting (210 µmol/m2/s), (2) energy efficient cultivation: diffuse greenhouse cover and lighting by 50% LED top lighting and 50% intermittent LED lighting (210 µmol/m2/s). In the energy efficient cultivation, 37% less electricity was used in the period October - May. However, energy use for heating in this treatment was higher to compensate for the lack of radiative heat. The light sum the plants received (sunlight + artificial lighting) was 6% lower in the energy efficient cultivation compared to the reference cultivation due to the lower number of lighting hours. However, the production difference was only 0.3 kg/m2, less than 1%! Detailed plant measurements showed hardly any differences between the treatments in light interception, light absorption by the leaves, photosynthesis and the production and distribution of assimilates. The analysis of the crop growth model showed that the effect of the lower number of lighting hours in the energy efficient cultivation was fully compensated by the positive effects of the diffuse greenhouse cover which has a higher light transmission.
    Praktijkproef LED Alstroemeria : invloed licht spectrum op bladkwaliteit : bouwstenen voor energiebesparing
    Garcia, N. ; Helm, F.P.M. van der; Warmenhoven, M.G. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1337) - 48
    glastuinbouw - cultuurmethoden - teelt onder bescherming - alstroemeria - belichting - led lampen - meting - fotosynthese - gewasanalyse - temperatuur - energiebesparing - greenhouse horticulture - cultural methods - protected cultivation - alstroemeria - illumination - led lamps - measurement - photosynthesis - plant analysis - temperature - energy saving
    Energy efficient cultivation of Alstroemeria requires more than just saving on heat. The total energy demand could be reduced by 40% if saving on lighting is possible. LED lighting can save 20% thanks to the higher efficiency of lamp and installation. If the morphology and quality of the foliage can be improved by manipulating the spectrum of the artificial light, then light interception and photosynthesis efficiency could improve too. The test at a commercial farm in winter 2013/2014 showed that plants grown under the conventional High Pressure Sodium lamps or under LED lamps (spectrum Valoya R300 AP67) did not differ in production and quality; this gives opportunities for energy savings with LED. The spectrum of Valoya R300 AP67 gave a slightly higher conductance of stomata and a higher photosynthesis was measured immediately after the dark period. However, this did not result in a higher production, more flowers or greener leaves, but it lead to a modest reduction in the number of necrotic leaf tips. The photosynthesis measurements suggest that low leaf temperatures in combination with long artificial light period may negatively influence leaf quality. A test with better insulation (transparent second screen) combined with dehumidification and shorter light period is therefore recommended.
    LED belichting in Alstroemeria
    Helm, F.P.M. van der; Garcia Victoria, N. ; Warmenhoven, M.G. - \ 2014
    alstroemeria - cultuurmethoden - glastuinbouw - teelt onder bescherming - winter - belichting - led lampen - gewaskwaliteit - gewasproductie - bladdiagnose - alstroemeria - cultural methods - greenhouse horticulture - protected cultivation - winter - illumination - led lamps - crop quality - crop production - foliar diagnosis
    Winterproductie van Alstroemeria is afhankelijk van belichting voor het voorkomen van knopverdroging. SON-T belichting (50-100 μmol/m²/s) wordt gebruikt tot een daglengte van 16 uur per dag, (kwantitatieve lange dag plant). In de winter is de bladkwaliteit van alstroemeria soms niet goed. Telers vermoeden een rol van belichten. Onderzocht is of LED belichting mogelijk kan bijdragen aan betere bladkwaliteit en productieverhoging bij een lagere stroomvraag.
    Grip on Light - Optimal Use of light for improving crop and reducing energy use in shade-tolerant pot plants
    Marcelis, L.F.M. ; Noort, F.R. van; Kempkes, F. ; Kromdijk, J. ; Li, T. ; Warmenhoven, M.G. ; Meinen, E. ; Snel, J.F.H. - \ 2014
    'Grip op licht' bij Phalaenopsis : Meer energie besparing bij Het Nieuwe Telen Potplanten met meer natuurlijk, diffuus licht en verbeterde monitoring
    Noort, F.R. van; Snel, J.F.H. ; Warmenhoven, M.G. ; Meinen, E. ; Steenhuizen, J.W. ; Kempkes, F.L.K. ; Marcelis, L.F.M. - \ 2014
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 1327) - 66
    glastuinbouw - potplanten - phalaenopsis - diffuus glas - lichtdoorlating - natuurlijk licht - energiebesparing - teeltsystemen - proeven - greenhouse horticulture - pot plants - phalaenopsis - diffused glass - light transmission - natural light - energy saving - cropping systems - trials
    Diffuus licht is gunstig voor plantgroei. Bovendien kan bij potplanten meer licht in de kas worden toegelaten als het diffuus is. In combinatie met Het Nieuwe Telen biedt dit mogelijkheden om zowel productie te verbeteren als energie te besparen. Er zijn proeven gedaan met twee Anthuriumrassen en twee Bromeliasoorten. Het licht werd diffuus gemaakt door een diffuus schermdoek, door diffuus glas of door te telen in de Daglichtkas. Ook bij veel instraling werd de luchtvochtigheid op peil gehouden door verneveling. In het zomerhalfjaar trad bij alle gewassen een spectaculaire groeiverbetering op door meer diffuus licht toe te laten; nooit trad er bladschade op. Zo waren de anthuriums in 16 weken vermarktbaar, terwijl dat in de praktijk 22 weken duurde, waarbij de planten ook nog eens 25% zwaarder waren dan in praktijk. Door toepassen van lichtintegratie en verlaging van het temperatuursetpoint werd 25% energie bespaard. Om risico op schade door teveel licht te kunnen voorkomen zijn methoden voor plantmonitoring verbeterd. Zo zijn enkele verbeteringen aan de Plantivity meter gemaakt waardoor de meter minder vaak (eens per week) van blad verwisseld hoeft te worden en de potentiele fotosynthese bepaald kan worden voor een betere inschatting van efficiëntie van fotosynthese. Grip on light in potted anthurium and bromeliads Diffuse light is beneficial for plant growth. Furthermore, in greenhouses with pot plants more light can be allowed if the light is diffuse. When combined with the Next Generation Cultivation (‘Het Nieuwe Telen’) new possibilities arise to improve production and to save energy. Experiments were conducted with two Anthurium cultivars and two Bromeliads. The light was made diffuse by a diffuse screen, diffuse glass or by growing the plants in the Daylight greenhouse. Air humidity was always maintained at high levels. In the summer half year the growth of all crops increased substantially by allowing more diffuse light; leaf damage never occurred. The anthurium plants were marketable within 16 weeks, whereas normally this takes 22 weeks; the plants were also 25% larger. Applying light integration and decreasing the set-point for heating saved 25% energy. To avoid the risk of leaf damage due to too much light, methods for plant monitoring were improved. The Plantivity sensor was improved such that the sensor can measure for one week on the same leaf instead of changing the leaf every 2-3 days. Furthermore, the sensor can now be used to measure potential photosynthesis which allows a better estimate of the efficiency of photosynthesis.
    Sustainable gerbera production realised with the next generation greenhouse cultivation
    Gelder, A. de; Warmenhoven, M.G. ; Dieleman, J.A. - \ 2014
    In: International Symposium on New Technologies for Environment Control, Energy-Saving and Crop Production in Greenhouse and Plant Factory - Greensys 2013. - Leuven : ISHS - ISBN 9789462610248 - p. 701 - 708.
    In spite of a considerable decrease during the last decade, energy consumption in greenhouse cultivation remains high. More sustainable greenhouse horticulture can be realised by developing new greenhouse and cultivation concepts. Recently, we developed the Next Generation Greenhouse Cultivation system, with which energy consumption in tomato can be reduced by 40% while maintaining production and quality. This concept is based on the use of thermal screens combined with control of a high humidity level, maximizing the integration capacity of the crop, improved CO2 efficiency by reducing ventilation, and greenhouse cooling combined with a heat pump and aquifer. We adapted this concept for Gerbera cultivation and tested it in three consecutive years of experimentation. This resulted in a reduction of energy consumption by 42-50% compared to that of commercial growers, while maintaining production levels. Energy reduction was realised by using thermal screens combined with forced ventilation and an adaptation of the lighting strategy. By using forced ventilation, the use of a fixed minimum pipe temperature can be abandoned, which is normally used to control humidity. In order to prevent low root temperatures, local heating was applied beneath the pots. The use of assimilation lighting was optimised based on the daily light integral required for the growth of Gerbera. This resulted in reducing the amount of assimilation lighting. By shortening the day length to 10.5 hours from October until January the number of flowers increased, albeit with a lower fresh weight. Recommendations for practical application for the use of screens, forced ventilation and optimal lighting strategies are given.
    Growth inhibition caused by reused drainage water; quest for cause and measuring method
    Maas, A.A. van der; Blok, C. ; Driever, S.M. ; Warmenhoven, M.G. ; Meijer, R.J.M. ; Marrewijk, I. van; Holtman, W. ; Oppedijk, B. - \ 2014
    In: Proceedings of the IS on Growing Media and Soilless Cultivation. - Leuven : ISHS - ISBN 9789462610217 - p. 109 - 116.
    Growth inhibition is often a reason for growers to refresh the recirculation water and to discharge the excess water. The cause of growth inhibition other than a high concentration of sodium or a disease is usually unclear. Objectives of the study were the determination of the cause of growth inhibition and the development of methods to determine growth inhibition in an early stage in the crop in situ without the use of more indirect bioassays. Potential growth inhibitory components in drain water of a rose cultivation have been investigated by means of stepped analysis in the crop, the substrate and in water. The course of the oxygen concentration in the root environment was monitored. The efficiency of photosynthetic light utilization had been measured with the aid of chlorophyll fluorescence on plant leaves in the crop. All the measurements were intended to determine a possible relationship between growth inhibition, photosynthesis and oxygen stress. The main results were: Water disinfec¬tion methods eliminated growth inhibition. Drainwater was filtered with filters of 0.2 and 0.45 µm. This resulted in a relative growth in the bioassay compared to untreated of 122% and 104%. Growth inhibition in water in the rose crop is probably caused by a microbiological factor with a bacterial origin. A mix of pesticides as used on com¬mercial nurseries has been tested with bioassays on cress seed. A 1, 10 and 100-fold concentration compared to the practical situation were tested. Pesticides in the drainage water in concentrations as used on commercial nurseries did not inhibit growth in the bioassays. Monitoring of the oxygen concentration in the water and root environment and the measurements of the light use efficiency showed no relationships with demonstrated growth inhibition. The value of these methods could not be assessed because growth inhibition was only found in conducted bioassays with drainage water and not in the crop.
    LED belichting in Alstroemeria
    Helm, F.P.M. van der; Garcia Victoria, N. ; Warmenhoven, M.G. - \ 2014
    alstroemeria - cultuurmethoden - winter - belichting - led lampen - gewaskwaliteit - bladeren - gewasproductie - energiebesparing - glastuinbouw - alstroemeria - cultural methods - winter - illumination - led lamps - crop quality - leaves - crop production - energy saving - greenhouse horticulture
    Winterproductie van Alstroemeria is afhankelijk van belichting voor het voorkomen van knopverdroging. SON-T belichting (50-100 μmol/m²/s) wordt gebruikt tot een daglengte van 16 uur per dag, (kwantitatieve lange dag plant). In de winter is de bladkwaliteit van alstroemeria soms niet goed. Telers vermoeden een rol van belichten. Onderzocht is of LED belichting mogelijk kan bijdragen aan betere bladkwaliteit en productieverhoging bij een lagere stroomvraag.
    Optimalisatie van Het Nieuwe Telen
    Gelder, A. de; Warmenhoven, M.G. ; Baar, P.H. van - \ 2014
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 1300) - 68
    glastuinbouw - teeltsystemen - tomaten - plantenontwikkeling - energiebesparing - ontvochtiging - schermen - cultuurmethoden - optimalisatiemethoden - landbouwkundig onderzoek - greenhouse horticulture - cropping systems - tomatoes - plant development - energy saving - dehumidification - blinds - cultural methods - optimization methods - agricultural research
    In het project Optimalisatie voor Het Nieuwe Telen is in 2013 door een combinatie van technieken en kennis van negen bedrijven en onderzoekspartijen op basis van Het Nieuwe Telen getracht de teeltwijze voor tomaat te verbeteren. Er is wel energie zuinig geteeld, maar de energiedoelstelling is niet gehaald, mede door de focus op de diverse instrumenten die in de proef zijn toegepast. Leerpunt is dat een sterke focus op beheersing van het energie gebruik een basis is voor een energiezuinige teelt. De andere instrumenten zijn te gebruiken om daarbovenop nog een optimalisatie slag te maken. Een strategie van ontvochtiging die de luchtvochtigheid te laag hield, kostte energie. Het Natugro concept heeft wel tot een sterke wortelvorming, maar niet tot sterkere groei geleid. Het dubbele schermdoek gaf geen extra energie besparing. Het zomerscherm leidde tot een beperkte teruggang in groei. De Paskal weegunits en Priva TopCrop kunnen in potentie gebruikt worden om teelt beslissingen te ondersteunen, ze waren tijdens het project echter nog onvoldoende uitontwikkeld. Het toepassen van verschillende gecombineerde technieken in een proef maak het onmogelijk om een goede uitspraak over het effect van één techniek te doen, zeker omdat meerdere groei beïnvloedende factoren die de groei beinvloeden. De analyse van de achterliggende factoren en processen is dan niet mogelijk. Uiteindelijk ging het in dit project op een optimale prestatie voor groei en energie besparing en die is niet gerealiseerd. Het was niet optimaal; wel zeer leerzaam is een goede typering van dit experiment.
    Optimalisatie van het Nieuwe Telen : Werkpakket Fotosynthesemonitoring
    Snel, J.F.H. ; Warmenhoven, M.G. ; Gelder, A. de - \ 2014
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 1299) - 24
    glastuinbouw - cultuurmethoden - energiebesparing - optimalisatiemethoden - gewasmonitoring - fotosynthese - sensors - meting - plantenontwikkeling - tomaten - greenhouse horticulture - cultural methods - energy saving - optimization methods - crop monitoring - photosynthesis - sensors - measurement - plant development - tomatoes
    In het nieuwe telen zullen investering, meeropbrengst en energiebesparing in balans moeten zijn. Teeltoptimalisatie moet voor een bedrijfszekere toepassing van energiebesparing zorgen. Monitoren van de gewasfotosynthese kan de teler hierbij behulpzaam zijn. In dit project is samen met Gademann Instruments een meetsysteem ontwikkeld waarmee PAR en fotosynthese in 8 gewaslagen gelijktijdig gemeten kan worden. De fotosynthese van alle lagen bij elkaar opgeteld levert de gewasfotosynthese. Daarnaast is software ontwikkeld om de meetdata on-line te bekijken en te analyseren. Vanaf eind juli zijn drie meetsystemen getest in een afdeling bij Wageningen UR en daarna in de proefafdelingen van het Improvement Centre. De resultaten laten zien dat in de periode september - oktober er binnen het gewas weinig variatie is in de relatie tussen PAR en fotosynthese. Dat geldt voor alle afdelingen. Ook werd duidelijk dat het gewas in geen van de afdelingen in die periode last had van lichtschade. Uit de resultaten blijkt wel dat de nauwkeurigheid van de PAR meting met de kleine interne PAR sensor te laag is voor een betrouwbare opschaling naar gewasfotosynthese. In Next Generation Greenhouse Cultivation applications investments, yield improvements and energy savings need to be in balance. Optimization of crop growth will have to ensure a reliable implementation of energy saving concepts. Monitoring of crop photosynthesis can assist the grower in optimizing light use and production. In this project Wageningen UR Greenhouse Horticulture and Gademann Instruments have developed and tested a monitoring system for PAR and photosynthesis in 8 crop layers simultaneously. The combined photosynthesis data from all layers is a measure for crop photosynthesis. Software was developed for on-line acces and analysis of real-time and stored data. Three units were first tested in a greenhouse compartment WUR and afterwards installed in the Improvement Centre. The results showed little variation in light response of leaves of the various crop layers during the monitoring period (September - October). It was also evident that the crop did not suffer from light stress, as judged by the high photosynthesis efficiency during the night (FV/FM). Evaluation of the results shows that the PAR measurement with the internal PAR sensor of the instrument is too inaccurate for a reliable upscaling to crop photosynthesis.
    ‘Grip op licht’ bij potanthurium en bromelia : Meer energie besparing bij Het Nieuwe Telen Potplanten met meer natuurlijk, diffuus licht en verbeterde monitoring
    Noort, F.R. van; Kromwijk, J.A.M. ; Snel, J.F.H. ; Warmenhoven, M.G. ; Meinen, E. ; Li, T. ; Kempkes, F.L.K. ; Marcelis, L.F.M. - \ 2014
    Wageningen UR Glastuinbouw
    CO2 niet meer dan genoeg: Teelt van Tomaat in 2012 bij Improvement Centre met lichtafhankelijk doseren van CO2
    Gelder, A. de; Warmenhoven, M.G. ; Dieleman, J.A. ; Klapwijk, P. ; Baar, P.H. van - \ 2014
    Wageningen UR Glastuinbouw
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