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 role of environmental shocks in shaping prosocial behavior
    Duchoslav, Jan - \ 2017
    Wageningen University. Promotor(en): E.H. Bulte, co-promotor(en): F. Cecchi. - Wageningen : Wageningen University - ISBN 9789463431477 - 190
    environment - behaviour - economic development - social behaviour - stress conditions - environmental temperature - physical properties - social environment - milieu - gedrag - economische ontwikkeling - sociaal gedrag - stress omstandigheden - omgevingstemperatuur - fysische eigenschappen - sociaal milieu

    All economic activity requires some degree of cooperation, and the process of economic development involves many social dilemmas. It is therefore crucial to understand how the preferences which guide our behavior vis-à-vis these situations are shaped. The ability and willingness to work for the benefit of the group rather than just one's own has evolved over many generations, and is – to some extent – innate to any healthy human being. At the same time, individual prosocial preferences are – also to a certain extent – endogenous to the physical and social environment within which we operate. This thesis identifies several ways in which environmental changes affect intrinsic prosocial preferences, and outlines a possible direction for fixing any such negative effects.

    In Chapter 1, I introduce the topic of prosocial preferences. I briefly describe how prosociality has been viewed over the course of scientific history, and summarize the current state of knowledge about the formation of social preferences. I further outline how extrinsic incentives can influence prosocial behavior without affecting the preferences which underpin it. Finally, the chapter contains an overview of the methodologies used throughout this thesis.

    In Chapter 2, I focus on an early formative factor of prosocial preferences—their fetal origins. I study how temperature shocks faced by pregnant women affect their children's later-life prosocial preferences. I find that exposure to higher than usual ambient temperatures during gestation reduces a child's probability of contribution to the public good, with the negative effect lasting into adulthood.

    Chapter 3 continues in the same vein as Chapter 2, looking at the fetal origins of prosocial preferences. In this chapter, I investigate how prenatal stress induced by random violence affects the preferences for cooperation among children born during an armed conflict. To do so, I exploit variations in the ratio of the lengths of the index and ring fingers—a marker of in utero hormone exposure negatively associated with high maternal distress during early fetal development. I show that prenatal stress reduces the probability that children contribute to the public good.

    In Chapter 4, I move away from the physical aspects of human environment, focusing instead on the social ones. I study the effects of a sudden introduction of a formal institution on individual cooperative behavior within informal arrangements. In particular, I look at how an NGO intervention which helped create a mutual health insurance affected cooperative behavior in a public goods game. I find that the introduction of formal insurance reduces contributions to the public good. This reduction in cooperation levels is, however, not due to the adopters of the formal insurance who may now have less need for informal reciprocal networks, and who therefore (partially) withdraw from them. It is instead the non-adopters who become less cooperative towards the adopters.

    To outline a possible direction for remedying the negative environmental effects on prosocial behavior described in the previous three chapters, I illustrate one of the ways in which prosocial behavior can be incentivized with a relatively simple and easily implementable policy. In Chapter 5, I evaluate the impact of introducing performance-based financial incentives on staff effort and, consequently, on allocative efficiency and output in healthcare provision. I show that in the case under investigation, financial incentives conditioned on output and worth roughly 5% of total expenditures increased staff effort to the extent that output rose by over 25%, without any detectable drop in the quality of the provided services. This not only shows the potential of incentive-compatible financing to improve the performance of underfunded healthcare systems in developing countries, but also that extrinsic motivation can be used to foster behavior which benefits the society rather than just the individual.

    Finally, I combine the main findings from the core chapters of the thesis in Chapter 6. I discuss their policy implications, and point out the some of the outstanding questions, outlining the directions for future research.

    Adapting greenhouse climate for enhanced biocontrol and better performance of plant protection products
    Vänninen, I. ; Meijer, R.J.M. - \ 2016
    BioGreenhouse (Fact sheet BioGreenhouse 12) - 2
    horticulture - greenhouse horticulture - plant protection - natural enemies - pesticides - environmental temperature - humidity - lighting - carbon dioxide - plant health - organic farming - tuinbouw - glastuinbouw - gewasbescherming - natuurlijke vijanden - pesticiden - omgevingstemperatuur - vochtigheid - verlichting - kooldioxide - plantgezondheid - biologische landbouw
    In greenhouse crop production, climatic parameters are often manipulated to optimize plant growth. Greenhouse climate has profound influences also on pests and their natural enemies used for biocontrol. The responses of arthropod pests, plant disease agents and natural enemies to constant temperatures and humidity are relatively well known, but many pertinent questions remain unsolved for pest and natural enemy biology and behaviour in conditions created by the newest greenhouse climate technologies and approaches. Greenhouse climate can be optimized also to benefit natural enemies and to work against pests and plant diseases, but we know less how to make this happen than we know how to manipulate plant growth through temperature, humidity, CO2 and light conditions.
    Primeur op congres: onderzoeksresultaten urban heat effect door kunstgras : WUR-onderzoeker bestudeert op verzoek van vakblad Fieldmanager
    Theeuwes, N.E. - \ 2015
    Fieldmanager 11 (2015)6. - ISSN 2212-4314 - p. 70 - 71.
    sportterreinen - grasveld - kunststoffen - natuurlijke graslanden - voetballen - omgevingstemperatuur - bodemtemperatuur - schaduw - sports grounds - grass sward - plastics - natural grasslands - soccer - environmental temperature - soil temperature - shade
    Er bestaat vermoedelijk een groot verschil tussen de temperatuur van kunstgras en die van natuurgras bij hitte. Als kunstgrasvelden hitte-eilandjes vormen, zou dit een groot effect hebben op het stadsklimaat. Natalie Theeuwes van de Wageningen Universiteit deed op verzoek van vakblad Fieldmanager wetenschappelijk onderzoek naar het urban heat effect door kunstgras en geeft de bezoekers van het Nationaal Sportvelden Congres de primeur van haar meetresultaten. Ook geeft zij advies over het minimaliseren van hittestress rónd de velden.
    Reproduction in crabs: strategies, invasiveness and environmental influences thereon
    Brink, A.M. van den - \ 2013
    Wageningen University. Promotor(en): Han Lindeboom, co-promotor(en): Aad Smaal; C. McLay. - S.l. : s.n. - ISBN 9789461735232 - 164
    krabben (schaaldieren) - geslachtelijke voortplanting - geslachtsselectie - groei - voortplantingsvermogen - invasieve soorten - populatiedynamica - omgevingstemperatuur - milieufactoren - mariene ecologie - crabs - sexual reproduction - sexual selection - growth - reproductive performance - invasive species - population dynamics - environmental temperature - environmental factors - marine ecology

    This thesis provides insights into the interconnectedness of crab reproductive biology, the selective forces leading to their development, the possible links to invasiveness and the influences of environmental factors thereon. The empirical data collected and presented in this thesis can be used to compare different crab species and make predictions about the effect of climate change on their population dynamics and invasiveness.
    Two crab species in particular are examined in this thesis, Halicarcinus cookii and Hemigrapsus takanoi , which share similar size and habitat preferences, but have different reproductive strategies and statuses as endemic and invasive. The potential effects of increased water temperature due to climate change on the reproduction and eventual population changes in the species are investigated as well as the possible links reproduction and temperature have with the invasiveness of a species.
    Halicarcinus cookii is an endemic crab to the coasts of New Zealand and is not known anywhere else. The species shows determinate growth, hard shell mating, continuous brood production and ventral seminal receptacles. After the final moult the female produces numerous offspring limited only by sperm availability. With a hard shell the female also avoids mortality resulting from the regular vulnerable soft shell stage. Individuals mature over a range of sizes but do not continue growing after their pubertal moult. With such a terminal moult, brood size is limited by female size.

    Hemigrapsus takanoi is native to the north west Pacific, but has been introduced and is very successful in Europe. The species shows indeterminate growth, hard-shell mating, a defined breeding season and ventral seminal receptacles. With indeterminate growth they continue moulting and growing throughout their adult life. After their pubertal moult, these species can mate throughout the year and produce 2-3 broods between each moult. They are not limited in growth or regeneration of limbs and can safely hide from predators during the vulnerable soft-shell inter-moult period rather than mating which exposes them to predators.

    Despite their different reproductive strategies, broods of both species showed a similar reaction to increased water temperature in that the duration of development of the brood decreased as temperature increased. Extrapolating the results to a climate change scenario, it is suggested that with a temperature rise of 2°C H. cookii could produce one extra brood of over 1000 offspring per female life time, potentially leading to a 10-15% increase in fecundity and possible population growth. As H. takanoi does not show continuous brood production, predicting the effect of temperature rise is more difficult, but evidence suggests that fecundity is also likely to increase in this species with an increase in water temperature.

    Temperature increase may also lead to a change in invasiveness of a species. If areas currently below the optimum temperature for a species become warmer, it is possible that a species may spread to the new locations. Hemigrapsus takanoi may spread further north in Europe than it’s current distribution (assuming it is limited by temperature). Furthermore, if temperatures increase the rate of reproduction in a non-indigenous species, they may become more invasive in their present location.

    The colonisation of a new habitat will involve new interactions, such as predation and competition, with species not previously encountered. The interactions of the two invasive crab species H. takanoi and Hemigrapsus sanguineus with the native Carcinus maenas in the delta waters of SW Netherlands was also investigated in this thesis. Whereas C. maenas was the most common shore crab in these waters, its numbers have declined on the soft sediment substrates during the last 20 years. As the two invasive crab species were first recorded in the Dutch delta in 1999, they could not have initiated the decline of the native C. maenas. However, within a few years H. takanoi completely dominated the intertidal hard substrate environments; the same environments on which juvenile C. maenas depend. On soft sediment substrate the native and invasive crab species are presently more or less equally abundant. Nowadays H. takanoi appears to be a fierce interference competitor or predator for small C. maenas specimens by expelling them from their shelters. However, due to the habitat generalist nature of C. maenas, it is unlikely that the Hemigrapsus species will cause it’s local extinction. More likely is that they will learn to live together.

    The objective to provide new information about a rarely studied species (Halicarcinus cookii) was fulfilled in this thesis and the information can be used as bases for comparison for future research.

    The hypothesis that temperature has no effect on the reproductive rate of crabs was rejected as both study species showed similar increases in brood development rate with increased temperatures. This suggests that global temperature rises may increase the reproductive rate of wider crab populations.

    The hypothesis that the arrival, presence and effect of Hemigrapsus takanoi in the Dutch delta waters has had no effect on the native green crab Carcinus maenas was complicated by the fluctuations and the decrease in C. maenas numbers prior to the arrival of H. takanoi. It was concluded that while H. takanoi did not cause the initial decrease in the C. maenas population, it did take advantage of it and now dominates niches previously occupied by juvenile C. maenas where size dependent competition and/or predation on juvenile C. maenas occurs.

    Optimizing shipment of lily buls in 40fr teefer containers
    Montsma, M.P. ; Staal, M.G. ; Lukasse, L.J.S. - \ 2011
    Wageningen : Wageningen UR - Food & Biobased Research (Report / Wageningen UR Food & Biobased Research nr. 1246) - ISBN 9789461730633 - 35
    lilium - lelies - containertransport - kwaliteit - omgevingstemperatuur - kwaliteitsnormen - landbouwkundig onderzoek - lilium - lilies - container transport - quality - environmental temperature - quality standards - agricultural research
    Lily bulbs is an extremely temperature sensitive and precious commodity. Every now and then it happens that upon delivery the condition of the bulbs is disappointing. Several measures can be taken to reduce the quality loss during transport, both in terms of reefer unit settings and in terms of stowage in the container. It is unclear what exactly is the consequence of which measure.
    Bastschade laanbomen door zonnebrand
    Sluis, B.J. van der - \ 2010
    boomteelt - gewasbescherming - proeven - straatbomen - schors, bomen - beschermende lagen - zonnebrand (sunscald) - zonnestraling - omgevingstemperatuur - beschadigingen door droogte - jute - rentabiliteit - arboriculture - plant protection - trials - street trees - bark - protective coatings - sunscald - solar radiation - environmental temperature - drought injury - jute - profitability
    Al een aantal jaren hebben laanboomkwekers te kampen met bastscheuren in de bomen. Vooral bij bomen in de buitenste rand en bij recent verplante bomen komen bastscheuren voor. Om dit ‘openklappen’ van de bast te voorkomen wordt de stam in de praktijk vaak omwikkeld met jute of rietmatten. Doel van het onderzoek is in een grootschalige praktijkproef de oorzaak van het ontstaan van de bastscheuren te achterhalen en oplossingen te vinden om dit probleem aan te pakken.
    Op een kaal plein valt niets te kiezen (Interview)
    Boo, M. de; Lenzholzer, S. - \ 2010
    Resource: weekblad voor Wageningen UR 4 (2010)20. - ISSN 1874-3625 - p. 12 - 15.
    stedelijke planning - ontwerp - open ruimten - klimaatverandering - stedelijke gebieden - straatbomen - omgevingstemperatuur - belevingswaarde - openbaar groen - groene gevels - groene daken - urban planning - design - open spaces - climatic change - urban areas - street trees - environmental temperature - experiential value - public green areas - green walls - green roofs
    Pleinen en straten worden geteisterd door gure windvlagen of je smelt juist weg als de zon flink schijnt. In haar proefschrift legt Sanda Lenzholzer uit dat ontwerpers meer rekening moeten houden met het microklimaat in de stad. Dat houdt ook de aso’s op afstand.
    Teler staat niet met lege handen tegenover Botrytis (interview met Leo Marcelis en Jantine Hofland)
    Bezemer, J. ; Marcelis, L.F.M. ; Hofland-Zijlstra, J.D. - \ 2010
    Onder Glas 7 (2010)2. - p. 36 - 37.
    tuinbouw - botrytis - deuteromycotina - microklimaat - omgevingstemperatuur - schimmelziekten - groenteteelt - vochtgehalte - luchtstroming - antagonisten - schimmelantagonisten - glastuinbouw - sierteelt - groenten - horticulture - botrytis - deuteromycotina - microclimate - environmental temperature - fungal diseases - vegetable growing - moisture content - air flow - antagonists - fungal antagonists - greenhouse horticulture - ornamental horticulture - vegetables
    Botrytis kan in heel wat gewassen fikse problemen veroorzaken. Omdat de sporen in een vochtige omgeving gaan kiemen, is een droog microklimaat de beste remedie. Maar het droogstoken van een hele kas is kostbaar. Met buitenluchtaanzuiging is een betere en energiezuinigere vochtbeheersing te realiseren. Het gewas voldoende open houden, blad snijden en luchtcirculatie zijn manieren om het gewenste microklimaat te bereiken. Antagonisten kunnen Botrytis preventief tegengaan en zijn een alernatief voor chemische middelen, terwijk bestuiving met oxidatieve zoeten of bestrlaing met UV-C-licht met namen in de na-oogst effectief kunnen zijn
    Bloemen in containers beter bekeken : samenvattend rapport
    Harkema, H. ; Westra, E.H. ; Boerrigter, H.A.M. - \ 2008
    Wageningen : Wageningen Agrotechnology & Food Innovations
    containertransport - bloemen - amaryllis - freesia - hyacinthus orientalis - lilium - narcissus - tulipa - tulpen - sierteelt - omgevingstemperatuur - allium - alstroemeria - anthurium - chrysanthemum - cymbidium - eremurus - hydrangea - container transport - flowers - amaryllis - freesia - hyacinthus orientalis - lilium - narcissus - tulipa - tulips - ornamental horticulture - environmental temperature - allium - alstroemeria - anthurium - chrysanthemum - cymbidium - eremurus - hydrangea
    Verslag naar onderzoek voor zes bloemsoorten (Amaryllis, Freesia, Hyuacint, Lelie, Narcis en Tulp) naar de geschiktheid voor langdurig gekoeld transport en de voorwaarden die gesteld moeten worden bij een dergelijk transport. Van acht bloemsoorten (Alliu, Alstroemeria, Anthurium, Chrysant, Cymbidium, Eremureus, Hydrangea en Zantedeschia) is eenamlig de transportgeschikheid en de optimale transporttemperatuur onderzocht.
    Evaporative heat loss from group-housed growing pigs at high ambient temperatures
    Huynh, T.T.T. ; Aarnink, A.J.A. ; Heetkamp, M.J.W. ; Verstegen, M.W.A. ; Kemp, B. - \ 2007
    Journal of Thermal Biology 32 (2007)5. - ISSN 0306-4565 - p. 293 - 299.
    environmental temperature - ammonia emission - slatted floor - behavior
    The effects of relative humidity and ambient temperature on evaporative heat loss were studied in 12 trials each with a group of 10 gilts with an initial BW of 61.7 kg (58.0¿65.5 kg). The ambient temperature inside a respiration chamber was increased by 2 °C d¿1 starting at 16 °C and ending at 32 °C. Relative humidity was set at 50%, 65% or 80% and remained constant within each trial. The animals had free access to feed and water. Skin temperature (SkinT), total heat production (HP), evaporative heat loss (EvapH), respiration rate (RR), and wallowing of the animals were recorded. SkinT was lowest at 80% relative humidity (P
    Effect of temperature on anaerobic treatment of black water in UASB-septic tank systems
    Luostarinen, S. ; Sanders, W.T.M. ; Kujawa-Roeleveld, K. ; Zeeman, G. - \ 2007
    Bioresource Technology 98 (2007)5. - ISSN 0960-8524 - p. 980 - 986.
    afvalwaterbehandeling - slibzuivering - huishoudens - excreten - anaërobe verteerders - slibvergisting - temperatuur - vergelijkend onderzoek - haalbaarheidsstudies - omgevingstemperatuur - waste water treatment - sludge treatment - households - excreta - anaerobic digesters - sludge digestion - temperature - comparative research - feasibility studies - environmental temperature - waste-water - domestic sewage - reactors - digestion
    The effect of northern European seasonal temperature changes and low temperature on the performance of upflow anaerobic sludge blanket (UASB)-septic tanks treating black water was studied. Three UASB-septic tanks were monitored with different operational parameters and at different temperatures. The results indicated the feasibility of the UASB-septic tank for (pre)treatment of black water at low temperatures with respect to removal of suspended solids and dissolved organic material. Inoculum sludge had little effect on CODss removal, though in the start-up phase some poorly adapted inoculum disintegrated and washed out, thus requiring consideration when designing the process. Removal of CODdis was at first negative, but improved as the sludge adapted to low temperature. The UASB-septic tank alone did not comply with Finnish or Dutch treatment requirements and should therefore be considered mainly as a pre-treatment method. However, measuring the requirements as mgCOD l-1 may not always be the best method, as the volume of the effluent discharged is also an important factor in the final amount of COD entering the receiving water bodies
    Microklimaatmetingen bij chrysant : metingen op een praktijkbedrijf
    Baas, R. ; Hoope, M.A. ten - \ 2006
    Wageningen : Praktijkonderzoek Plant & Omgeving B.V. (PPO publicatie 324161500) - 28
    microklimaat - omgevingstemperatuur - relatieve vochtigheid - effecten - richtlijnen (guidelines) - belichting - chrysanten - chrysanthemum - invloeden - energiebesparing - microclimate - environmental temperature - relative humidity - effects - guidelines - illumination - chrysanthemums - chrysanthemum - influences - energy saving
    Op een praktijkbedrijf zijn in de periode december8januari 2005/2006 58minuutgegevens verzameld van de RV in het gewas op buishoogte en onder in het gewas met niet-geventileerde loggers, planttemperaturen van kop en op buishoogte met infraroodmeters, PAR, en meetgegevens/instellingen van de regelcomputer. Resultaten van onderzoek en aanbevelingen Getracht is om meer inzicht te verkrijgen in het microklimaat en de invloedsfactoren hierop
    Wortellesie-aaltjes in amaryllis gedijen uitstekend bij ruim 20 graden Celsius
    Stapel, L.H.M. - \ 2006
    BloembollenVisie 2006 (2006)81. - ISSN 1571-5558 - p. 22 - 23.
    gewasbescherming - plagenbestrijding - amaryllis - nematoda - pratylenchus penetrans - pratylenchus scribneri - toegepast onderzoek - wortelzonetemperatuur - temperatuur - omgevingstemperatuur - onderzoeksinstituten - plant protection - pest control - amaryllis - nematoda - pratylenchus penetrans - pratylenchus scribneri - applied research - root zone temperature - temperature - environmental temperature - research institutes
    Resultaten uit het onderzoek naar aantasting van Hippeastrum (Amarillis) door de wortellesie-aaltjes Pratylenchus penetrans en P. scribneri
    Proeven met bovenafscherming bij roos en tomaat: Warmteoverschot is hèt knelpunt bij belichting met de schermen dicht
    Arkesteijn, Marleen ; Marissen, A. ; Rijssel, E. van - \ 2006
    Onder Glas 3 (2006)4. - p. 4 - 5.
    teelt onder bescherming - lichtregiem - schermen - omgevingstemperatuur - milieubeheersing - warmteproductie - rozen - tomaten - glastuinbouw - groenten - snijbloemen - protected cultivation - light regime - blinds - environmental temperature - environmental control - heat production - roses - tomatoes - greenhouse horticulture - vegetables - cut flowers
    Het warmteoverschot in de kas vormt het grootste struikelblok voor de telers als de voorgestelde regels, voor afscherming van het licht via bovenschermen, worden doorgevoerd. Bijkomende knelpunten zijn meer horizontale temperatuurverschillen en een onrustiger klimaatregeling. Er blijkt geen vochtprobleem op te treden. De problemen zijn groter bij intensief belichte gewassen zoals roos, dan bij minder langdurig belichte gewassen
    Zomerklimaat bij anjer : invoed etmaaltemperatuur in de zomer op productie en kwaliteit bij anjer
    Leeuwen, G.J.L. van; Mourik, N.M. van; Schrama, P.M.M. - \ 2005
    Aalsmeer : PPO BU Glastuinbouw - 29
    dianthus caryophyllus - anjers - omgevingstemperatuur - gewasproductie - kwaliteit - nederland - dianthus caryophyllus - carnations - environmental temperature - crop production - quality - netherlands
    Heat stress in growing pigs
    Huynh Thi Thanh Thuy, - \ 2005
    Wageningen University. Promotor(en): Martin Verstegen; Bas Kemp, co-promotor(en): Andre Aarnink. -
    varkens - warmtestress - groei - omgevingstemperatuur - dierfysiologie - diergedrag - mestresultaten - afmesten - koelsystemen - pigs - heat stress - growth - environmental temperature - animal physiology - animal behaviour - fattening performance - finishing - cooling systems
    Compared to other species of farm animals, pigs are more sensitive to high environmental temperatures, because they cannot sweat and do not pant so well. Furthermore, fast-growing lean pigs generate more heat than their congeners living in the wild. This, in combination with confined housing, makes it difficult for these pigs to regulate their heat balance. Heat stressed pigs have low performance, poor welfare, and, by pen fouling, they give higher emissions of odour and ammonia.

    Above certain critical temperatures (inflection point temperatures) pigs start to adapt their mechanisms of balancing heat loss and heat production. The inflection point temperatures above which the responses change may well differ depending on which animal parameter is studied. Within this thesis, firstly, these critical temperatures were determined for different physiological, behavioral and production parameters. Secondly, the effect of different cooling systems on these parameters was studied.

    In order of appearance we found inflection point temperatures for lying on slatted floor, respiration rate, evaporative water, ratio of water to feed intake, total heat production, activity heat production, voluntary feed intake and rectal temperature. These inflection point temperatures were different for the different parameters and show the subsequent strategies the pig follows at increasing temperatures. Relative humidity had minor effects on physiological parameters. However, a combination of high relative humidity and high temperature showed a detrimental effect on daily gain.Theavailability of cooling systems, e.g. floor cooling, water bath or sprinklers, had beneficial effects on pigs' performance.

    It is concluded that high ambient temperatures strongly affect physiology, behaviour and performance of growing pigs.The inflection point temperatures found in this study are good indicators of heat stress. These can be used as set points for cooling systems. Cooling systems improve animal performance and welfare under high temperature conditions.

    Klimaat regelen met planttemperatuur niet moeilijk
    Houter, G. ; Campen, J. - \ 2005
    Groenten en Fruit. Algemeen 2005 (2005)37. - ISSN 0925-9694 - p. 22 - 23.
    kassen - klimaatregeling - luchttemperatuur - omgevingstemperatuur - plantenontwikkeling - bloei - vruchtzetting - narijpen - vochtigheid - vochtigheidsmeters - tomaten - cultuurmethoden - glastuinbouw - greenhouses - air conditioning - air temperature - environmental temperature - plant development - flowering - fructification - after-ripening - humidity - humidity gauges - tomatoes - cultural methods - greenhouse horticulture
    De planttemperatuur beïnvloedt de snelheid waarmee een plant zich ontwikkelt. Telers zouden het kasklimaat kunnen regelen op basis van deze planttemperatuur, in plaats van op de temperatuur van de kaslucht. Toch gebeurt dit in de praktijk nog nauwelijks. PPO in Naaldwijk en A&F in Wageningen onderzochten de mogelijkheden in een tomatenteelt
    Gebruik van onderstammen bij vruchtgroenten : inventarisatie van de mogelijkheden voor energiebesparing
    Dieleman, J.A. ; Heuvelink, E. - \ 2005
    Wageningen : Plant Research International (Nota / Plant Research International 367) - 36
    solanum lycopersicum - cucumis sativus - capsicum annuum - solanum melongena - tomaten - komkommers - aubergines - vruchtgroenten - onderstammen - het enten (grafting) - energieterugwinning - plantenfysiologie - omgevingstemperatuur - nederland - paprika - energiebesparing - solanum lycopersicum - cucumis sativus - capsicum annuum - solanum melongena - tomatoes - cucumbers - aubergines - fruit vegetables - rootstocks - grafting - energy recovery - plant physiology - environmental temperature - netherlands - sweet peppers - energy saving
    Het gebruik van onderstammen in de vruchtgroenteteelt is sterk in opkomst en heeft geleid tot een stijging van de productie. Het gebruik van speciaal geselecteerde onderstammen biedt de mogelijkheid om bij lagere temperaturen te telen zonder productie in te leveren. Daarmee kan energie worden bespaard
    Warmtebronnen vergeleken: opfok kalkoenkuikens
    Veldkamp, T. ; Lourens, A. ; Coenen, E. - \ 2005
    De Pluimveehouderij 35 (2005)15. - ISSN 0166-8250 - p. 20 - 21.
    kalkoenen - kuikens - verwarmingslampen - verwarmingsapparatuur - groei - licht - lichaamstemperatuur - omgevingstemperatuur - prestatieniveau - technische informatie - turkeys - chicks - heat lamps - heaters - growth - light - body temperature - environmental temperature - performance - technical information
    Op verzoek van de kalkoenensector hebben de Productschappen Vee, Vlees en Eieren de divisie Praktijkonderzoek van de Animal Sciences group van Wageningen UR gevraagd onderzoek te verrichten naar factoren die de opfok van kalkoenen kunnen optimaliseren
    Zomereenden met wintergroei
    Krimpen, M.M. van; Buisonjé, F.E. de; Hoekman, J.J. - \ 2004
    De Pluimveehouderij 34 (2004)8. - ISSN 0166-8250 - p. 10 - 11.
    eendenvoeding - eenden - voersamenstelling - voederconversie - aminozuren - groei - omgevingstemperatuur - energieopname - slachtdieren - karkaskwaliteit - duck feeding - ducks - feed formulation - feed conversion - amino acids - growth - environmental temperature - energy intake - meat animals - carcass quality
    In de zomerperiode, bij hoge omgevingstemperaturen, blijft de energieopname en de groei van vleeseenden achter. Is dat met meer energie en meer aminozuren in het voer te verbeteren, zonder dat de slachtkwaliteit verslechtert? Het Praktijkonderzoek van de Animal Sciences Group van Wageningen UR in Lelystad heeft dit onderzocht
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