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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    Photosynthetic efficiency in microalgal lipid production
    Remmers, Ilse M. - \ 2017
    Wageningen University. Promotor(en): R.H. Wijffels, co-promotor(en): P.P. Lamers. - Wageningen : Wageningen University - ISBN 9789463434607 - 200
    algae - biofuels - light - triacylglycerols - lipids - metabolism - algae culture - cultural methods - algen - biobrandstoffen - licht - triacylglycerolen - lipiden - metabolisme - algenteelt - cultuurmethoden

    Microalgae can contain large amounts of lipids which make them a promising feedstock for sustainable production of food, feed, fuels and chemicals. Various studies, including pilot-scale, have been performed and the knowledge on microalgal processes has advanced quickly. Unfortunately, current production costs for cultivation are still too high for bulk lipid production from microalgae.

    One of the major causes for the high costs of bulk lipid production is the reduced solar-to-lipid conversion efficiency. Current research, however, does not provide sufficient insight to identify optimization targets. Therefore, in this thesis we have studied the lipid production in microalgae in depth.

    Different TAG-accumulation strategies were investigated from a process engineering and metabolic point of view. The combination of all findings were used in the general discussion to thoroughly evaluate the microalgal lipid accumulation strategies. Current phototrophic microalgal lipid yields are still 10 times lower than the theoretical maximum. There is, however, still an enormous potential for further improvements. Future research should focus on (genetically) improved strains and advanced cultivation strategies, including adaptation to fluctuating outdoor weather conditions.

    This thesis was performed within the EU FP7 FUEL4ME project under grand agreement No 308938. Objective of this program is to develop a sustainable and scalable process for biofuels from microalgae and to valorize the by-products.

    Is there life after hype for Jatropha? Exploring growth and yield in Indonesia
    Tjeuw, Juliana - \ 2017
    Wageningen University. Promotor(en): K.E. Giller; M. van Noordwijk, co-promotor(en): M.A. Slingerland. - Wageningen : Wageningen University - ISBN 9789463431927 - 223
    fuel crops - jatropha curcas - crop yield - new crops - feasibility studies - indonesia - cultural methods - cultivation - disincentives - biobased economy - cropping systems - intercropping - brandstofgewassen - jatropha curcas - gewasopbrengst - nieuwe cultuurgewassen - haalbaarheidsstudies - indonesië - cultuurmethoden - teelt - belemmeringen - biobased economy - teeltsystemen - tussenteelt

    Jatropha curcas L. is a biofuel crop that has not lived up to expectations due to a combination of hype and disappointment and biophysical factors. This PhD thesis is based on the plant production component of the JARAK programme which aimed to bridge the gap between truth and fiction. This study reviewed the jatropha hype and disappointment and further investigated the hypothesis that jatropha growth and yield are limited by biophysical factors of plant characteristics, cropping systems, and management. My review of the hype and disappointment shows that despite the high expectations fuelled by market pull and technology push, and numerous actors, the commercial potential for jatropha is limited by policy and governance, economics, social, technology, logistical, and environmental. A study of the biophysical components confirms that no current varieties suited to different cropping systems and locations are available. Jatropha aboveground biomass is partitioned predominantly into a structure of stem, branches, and twigs. The below to aboveground biomass ratio was 0.5 and fruit which was found only on productive twigs accounted for the smallest portion of biomass measured. Seed yields were disappointingly small (109 kg ha-1) and were largest in monoculture, followed by intercropping and hedgerows in that order, although yields were influenced by age and management of pruning and fertiliser. Seed yield across the three cropping systems can be predicted using plant height and the number of productive twig/branch, although the number of inflorescence clusters per productive twig may be important. Intercropping between jatropha and maize (Zea mays L.) resulted in competition for resources both belowground and aboveground that reduced maize yields. Shoot pruning was effective in managing aboveground competition, while root pruning and root barriers effectively managed competition belowground. Leaf prunings provided a limited, but positive fertility effect on maize yield comparable to 21 kg N ha-1. Jatropha - maize intercropping has potential for long-term productivity provided management practices such as fertiliser, pruning, and planting density can be developed to minimise competition and enhance complementarity. Based on my review of the jatropha hype and disappointment and my biophysical research results, the planting of jatropha by smallholders, or as a plantation crop cannot be recommended. Once the issues I highlight have been resolved and market confidence restored, jatropha may finally become a commercial source of biodiesel able to provide improved socio-economic and environmental benefits.

    Biobased Economy: Algen, het groene goud
    Barbosa, M.J. - \ 2016
    Wageningen : Wageningen University & Research
    algenteelt - algen - biomassa productie - teeltsystemen - cultuurmethoden - biobased economy - algae culture - algae - biomass production - cropping systems - cultural methods - biobased economy
    De wereldbevolking groeit en daarmee ook de behoefte aan energie, chemicaliën, en producten zoals plastic, zeep, schoonmaakmiddelen, verf en lijm. Om daarin te kunnen voorzien, moeten we overstappen naar een economie, waarin we de grondstoffen voor deze producten uit duurzame, hernieuwbare bronnen halen. Een voorbeeld van een van de meest duurzame oplossingen zijn micro-algen. Maria Barbosa van Wageningen University & Research vertelt er alles over.
    Veenvrij substraat : Verkenning van de mogelijkheden van veenvrij substraat in de teelt van laanbomen (opzetters)
    Sluis, B.J. van der; Reuler, H. van - \ 2016
    Randwijk : Wageningen Plant Research, Bloembollen, Boomkwekerij & Fruit (Rapport 2016-09) - 21
    substraten - kweekmedia - bomen - turf - potcultuur - cultuurmethoden - containerplanten - substrates - culture media - trees - peat - pot culture - cultural methods - container grown plants
    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
    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.
    Vervangt led straks SON-T in gerberateelt?
    Dueck, T.A. ; Kempkes, F.L.K. - \ 2015
    Kas techniek 2015 (2015)1. - p. 16 - 19.
    glastuinbouw - kastechniek - belichting - led lampen - gerbera - snijbloemen - energiebesparing - cultuurmethoden - energiegebruik - greenhouse horticulture - greenhouse technology - illumination - led lamps - gerbera - cut flowers - energy saving - cultural methods - energy consumption
    Veel belichtingsinstallaties in de gerberateelt bestaan nog uit 600W armaturen. Bij vervanging worden vaak 1000W SON-T lampen gebruikt. De praktijk laat zien dat onder een hogere lichtintensiteit, de gerbera meer toegevoegd groeilicht nodig heeft voor de afsplitsing en ontwikkeling van één enkele bloem. Het lijkt er dan ook op dat de efficiency van de plant terugloopt. Kan led een oplossing bieden voor energiebesparing en sturing van het gewas?
    Hightech kas voor subtropisch klimaat Taiwan
    Hemming, S. ; Os, E.A. van - \ 2015
    Kas techniek 2015 (2015)5. - p. 56 - 57.
    glastuinbouw - kastechniek - technologieoverdracht - bouwconstructie - klimaatregeling - productiegroei - doelstellingenmanagement - kasgewassen - milieubeheersing - cultuurmethoden - kennisoverdracht - greenhouse horticulture - greenhouse technology - technology transfer - building construction - air conditioning - crop production - management by objectives - greenhouse crops - environmental control - cultural methods - knowledge transfer
    Taiwan is een van de meest innovatieve landen in de wereld als het gaat om technologische ontwikkelingen. Dat geldt echter in mindere mate als het gaat om de lokale productie van verse groenten in kassen. De Taiwanese overheid heeft daarom een strategie uitgezet om de lokale tuinbouwsector te moderniseren, de bijdrage aan de nationale economie te verhogen en de positie op binnen- en buitenlandse markten te versterken. Wageningen UR Glastuinbouw speelt daarin een belangrijke rol.
    Nieuwe inzichten vereist voor goed sturen op onderhoudsademhaling : onderhoud gaat altijd voor de groei
    Elings, A. ; Heuvelink, E. ; Kierkels, T. - \ 2015
    Onder Glas 12 (2015)3. - p. 16 - 17.
    glastuinbouw - cultuurmethoden - plantkunde - plantenfysiologie - fotosynthese - innovaties - landbouwkundig onderzoek - plantenontwikkeling - temperatuur - greenhouse horticulture - cultural methods - botany - plant physiology - photosynthesis - innovations - agricultural research - plant development - temperature
    De verschillende soorten ademhaling bij de plant wekken vaak verwarring. De enige soort waar de teler echt vat op heeft, is de onderhoudsademhaling. Om daar goed op te kunnen sturen, zijn wel nieuwe inzichten noodzakelijk, met name in het verloop over het etmaal.
    Met ethyleen heb je de afrijping van tomaten beter in de hand : goed alternatief voor de bespuiting met ethrel
    Stijger, H. ; Janse, J. - \ 2015
    Onder Glas 12 (2015)6/7. - p. 24 - 25.
    glastuinbouw - groenten - tomaten - cultuurmethoden - rijp worden - ethyleen - gewaskwaliteit - teeltsystemen - arbeid (werk) - greenhouse horticulture - vegetables - tomatoes - cultural methods - ripening - ethylene - crop quality - cropping systems - labour
    Het goed afrijpen van de laatste tomaten aan het eind van de teelt is veelal een probleem. Met een gecontroleerde toediening van ethyleengas is het rijpingsproces te bevorderen. Tomatenkwekerij Van Heijningen in Maasdijk heeft hier goede ervaringen mee opgedaan.
    Open gewas kan productie vervroegen en energie besparen : Filosoferen over Het Nieuwe Gewas
    Velden, P. van; Gelder, A. de - \ 2015
    Onder Glas 12 (2015)6/7. - p. 14 - 15.
    glastuinbouw - tomaten - groenten - cultuurmethoden - ontbladering - snoeien - gewasproductie - bereikt resultaat - landbouwkundig onderzoek - greenhouse horticulture - tomatoes - vegetables - cultural methods - defoliation - pruning - crop production - achievement - agricultural research
    Heeft een tomatenplant veel blad nodig om tot een goede productie te komen? Dat is de centrale vraag binnen het project Het Nieuwe Gewas. De proef bij Wageningen UR Glastuinbouw geeft een verrassend resultaat, want ‘plantje pesten’ door extra blad weg te snijden geeft iets productieverhoging in plaats van verlaging.
    Systematische aanpak overmatige wortelgroei loont Biostimulant werkt alleen in de goede omgeving
    Kierkels, T. ; Streminska, M.A. ; Wurff, A.W.G. van der - \ 2015
    Onder Glas 12 (2015)2. - p. 23 - 23.
    glastuinbouw - cultuurmethoden - substraten - kweekmedia - plantenziekteverwekkende bacteriën - rhizobium rhizogenes - tomaten - landbouwkundig onderzoek - ziektepreventie - maatregelen - groeiregulatoren - greenhouse horticulture - cultural methods - substrates - culture media - plant pathogenic bacteria - rhizobium rhizogenes - tomatoes - agricultural research - disease prevention - measures - growth regulators
    Het wordt steeds duidelijker dat heel steriel werken de bacterie die voor overmatige wortelgroei zorgt, kan bevoordelen. Het antwoord: systematisch en op het juiste tijdstip het nuttige bodemleven opbouwen in het substraat. Proeven op dit gebied geven goede hoop dat dit de juiste aanpak is.
    Sturen op balans source en sink ingewikkelde zaak : temperatuur aanpassen aan de beschikbare straling
    Elings, A. ; Heuvelink, E. ; Kierkels, T. - \ 2015
    Onder Glas 2015 (2015)4. - p. 36 - 37.
    glastuinbouw - cultuurmethoden - teelt onder bescherming - lichtregiem - assimilatie - temperatuur - groenten - snijbloemen - plantenontwikkeling - energiebesparing - greenhouse horticulture - cultural methods - protected cultivation - light regime - assimilation - temperature - vegetables - cut flowers - plant development - energy saving
    ‘Met het licht meetelen’ is een bekend principe binnen Het Nieuwe Telen. Het betekent dat je de temperatuur aanpast aan het beschikbare licht. De insteek daarbij is vaak energiebesparing, maar ook vanuit plantkundig oogpunt is dat verstandig. Zo breng je source en sink meer in balans.
    Waterbesparing door slimme en betaalbare sensor
    Balendonck, J. - \ 2015
    Kas techniek 2015 (2015)april. - p. 34 - 37.
    teelt onder bescherming - cultuurmethoden - kunststoftunnels - irrigatie - sensors - instrumenten (meters) - waterbehoefte - vochtmeters - watergebruik - efficiëntie - watergebruiksrendement - irrigatiesystemen - protected cultivation - cultural methods - plastic tunnels - irrigation - sensors - instruments - water requirements - moisture meters - water use - efficiency - water use efficiency - irrigation systems
    Onderzoekers van Wageningen UR Glastuinbouw hebben in het kader van een Partners voor Water-project laten zien dat Turkse telers met behulp van de AquaTag veel efficiënter kunnen irrigeren. Sturen op vochtsensoren is niet nieuw, maar beschikbare sensoren zijn relatief duur en meten alleen lokaal, terwijl het vochtgehalte sterk kan variëren binnen een kraanvak. Met de AquaTag is nu een goedkope en slimme oplossing voor handen.
    Nitrogen: The most important nutritional element for the plant : complicated balance between vegetative and generative growth
    Heuvelink, E. ; Kierkels, T. - \ 2015
    In Greenhouses : the international magazine for greenhouse growers 4 (2015)2. - ISSN 2215-0633 - p. 44 - 45.
    glastuinbouw - plantenvoeding - voedingsstoffen - voedingsstoffenbeschikbaarheid - opname (uptake) - plantenfysiologie - nitraten - ammonium - cultuurmethoden - greenhouse horticulture - plant nutrition - nutrients - nutrient availability - uptake - plant physiology - nitrates - ammonium - cultural methods
    Nitrogen is found in almost all parts of the plant. It’s one of the plant’s most essential nutritional element. There’s a tendency in greenhouse horticulture to over-fertilise. In most situations it’s difficult to get around this. However, more precise application offers more possibilities to control production.
    Onderzoek stuurlicht Freesia winter 2013-2014 : praktijkonderzoek met lage intensiteit LED belichting tijdens de donkerperiode
    Kromwijk, J.A.M. ; Echtelt, E. van; Akerboom, T. ; Pronk, H. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1346) - 28
    glastuinbouw - freesia - cultivars - cultuurmethoden - energiebesparing - belichting - led lampen - verrood licht - temperatuur - gewasproductie - greenhouse horticulture - freesia - cultivars - cultural methods - energy saving - illumination - led lamps - far red light - temperature - crop production
    The use of low intensity red or far-red LED light during the dark period was tested in a commercial greenhouse at Akerboom Freesia. The use of red or far-red light in the dark period had no clear effect in Freesia. The production of the variety ‘Ambiance’ increased 6% at 8 μmol.m-2.s-1 red LED light during the dark period, but there was no increase in production for the variety ‘PinkPassion’. Low intensity far-red during the night period did not give an increase in production. It was shown that it is possible to realise a good Freesia production in a greenhouse with a lower intensity assimilation lighting. This was in combination with a lower temperature which resulted in a longer growing period compared to the cultivation of Freesia in a greenhouse with a higher intensity assimilation lighting and higher temperature.
    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.
    Onderzoek stuurlicht Freesia winter 2012-2013 : praktijkonderzoek met lage intensiteit LED belichting tijdens de donkerperiode
    Kromwijk, J.A.M. ; Echteld, E. van; Akerboom, T. ; Pronk, H. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1347) - 24
    glastuinbouw - freesia - cultivars - belichting - led lampen - verrood licht - plantenontwikkeling - cultuurmethoden - effecten - greenhouse horticulture - freesia - cultivars - illumination - led lamps - far red light - plant development - cultural methods - effects
    Low intensity red or far-red LED light (4 µmol.m-2.s-1) during the dark period was tested in a commercial greenhouse (Akerboom Freesia). During the day assimilation lighting was used. The trial showed no clear effect on production. At the first planting date, plants showed symptoms of virus, so no production counts were carried out. At the second planting date, only small differences in production were observed (max. 6% difference in production) and there was no clear correlation with the treatments. This might be a result of low intensities of red and far-red light reaching the control plots and/or the variety used in this experiment (Ambassador). The production increase varied from 5% for the variety Albatros to 22% for the variety Red Beauty in a previous experiment with red and far-red LED light on Freesia. Ambassador maybe less sensitive to low intensity LED light during the dark period than the other cultivars.
    Weerbare chrysantenteelt in substraatloze systemen : zes voortgangsflyers van het onderzoekswerk in 2014
    Eveleens-Clark, B.A. ; Blok, C. ; Streminska, M.A. ; Beerens, N. ; Vermeulen, T. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1344) - 20
    teeltsystemen - cultuurmethoden - hydrocultuur - gewasbescherming - proeven - chrysanten - plantenziekten - vermeerderingsmateriaal - landbouwkundig onderzoek - cropping systems - cultural methods - hydroponics - plant protection - trials - chrysanthemums - plant diseases - propagation materials - agricultural research
    Substraatloze teeltsystemen zijn niet steriel. In het water, op de bodem en aan de wortels leven veel microorganismen. Het is daarom de uitdaging in een dergelijk ecosysteem een goede balans te krijgen waar ziekteverwekkers niet de overhand kunnen krijgen en tot infectie overgaan. Het onderzoek aan dergelijke weerbare systemen is de laatste jaren in volle gang. Dit rapport geeft de kennisontwikkeling in het eerste jaar (2014) weer. Het onderzoek aan micro-leven in het water staat aan de basis van het denken in eco-systemen in waterige systemen. De rapportage bestaat uit flyers met de opzet en de conclusies van elke teelt afzonderlijk en een flyer met de observaties en conclusies die over het algemeen getrokken kunnen worden.
    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.
    In search of compact pot plants without chemicals : control possible by manipulating DIF and DROP
    Heuvelink, E. ; Kierkels, T. - \ 2015
    In Greenhouses : the international magazine for greenhouse growers 4 (2015)1. - ISSN 2215-0633 - p. 40 - 41.
    glastuinbouw - potplanten - teelt - cultuurmethoden - cultivars - plantenontwikkeling - groeivertraging - groeiremmers - plantengroeiregulatoren - temperatuur - lichtregiem - greenhouse horticulture - pot plants - cultivation - cultural methods - cultivars - plant development - growth retardation - growth inhibitors - plant growth regulators - temperature - light regime
    Alternatives to growth inhibitors for pot plants are welcome. Scientific research points to cultivation practises that can inhibit growth. These offer possibilities where breeding fails to provide a solution.
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