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Ondanks lager CO2-niveau dan praktijk toch ruim 65 kg tomaten per m2: 2SaveEnergy kas maakt besparingsbelofte waar
Kempkes, Frank ; Janse, Jan - \ 2018
10% lichtwinst door transparant dek, uniek scherm en gecoate constructie: winterlichtkas maakt belofte waar, ook in de zomer
Kempkes, Frank ; Janse, Jan - \ 2018
Recordtijden met sla in Bleiswijkse kas: tuinen bij Wageningen University & Research
Janse, Jan - \ 2018
Emissieloos telen op ongebufferd kokossubstraat met goede resultaten: onderzoekers zien verhoogd bewustzijn bij ondernemers
Os, Erik van; Janse, Jan - \ 2018
Lichtmetingen op komkommerbedrijven met LED-tussenbelichting : begeleiden en monitoren van energie-innovaties in de praktijk
Janse, Jan ; Weerheim, Kees ; Dieleman, Anja - \ 2018
Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport / Wageningen University & Research, BU Glastuinbouw : WPR-763) - 25
Light interception was measured by Wageningen University & Research Greenhouse Horticulture at two nurseries with cucumbers in a high wire system and a different orientation of the LED-interlighting. The canopy density appeared to be very important for the light interception and up and down light loss. The total light loss to the greenhouse cover and floor was 17 en 34% on both nurseries, respectively. In the middle of the path between crop rows, 17 and 34% of the LED light was still measured, respectively. However, this light will largely be captured by plants of the neighbouring row. The measured interception of the sunlight by the plants, was on both nurseries respectively 96 and 87%. Per 1% additional LED light, a production increase of 0.8% was realised. The project was funded by Kas als Energiebron.
The Timing of Initiating Complementary Feeding in Preterm Infants and Its Effect on Overweight : A Systematic Review
Vissers, K.M. ; Feskens, E.J.M. ; Goudoever, J.B. van; Janse, A. - \ 2018
Annals of Nutrition & Metabolism 72 (2018)4. - ISSN 0250-6807 - p. 307 - 315.
What is the appropriate time to start complementary feeding for preterm infants? The answer to this question is yet under debate. The timing of initiating complementary feeding may be associated with overweight in
term infants. This systematic review aimed to study the effect of the timing of initiating complementary feeding on overweight in preterm infants. Predefined search items included preterm infants, complementary feeding, overweight, and their synonyms.
The search identified 15,749 articles, of which 5 articles were included. Three
studies presented data of randomized controlled trials and 2 studies were
trials found no significant difference in body mass index (BMI) Z-score between the intervention groups at 12 months of age. One randomized controlled trial presented a significant greater mean rate of growth in length per week until 12 months in the preterm weaning strategy-group compared
with the current best practices. One observational study concluded that each month the infants received complementary food later, the Z-score for length and weight was reduced by 0.1.
Key Messages:
No clear conclusion could be drawn from the included studies. This review illustrates the need for further research to access the effect of the timing of
initiating complementary feeding on overweight in preterm infants.
Response of submerged macrophyte communities to external and internal restoration measures in north temperate shallow lakes
Hilt, Sabine ; Alirangues Nuñez, Marta M. ; Bakker, Elisabeth S. ; Blindow, Irmgard ; Davidson, Thomas A. ; Gillefalk, Mikael ; Hansson, Lars Anders ; Janse, Jan H. ; Janssen, Annette B.G. ; Jeppesen, Erik ; Kabus, Timm ; Kelly, Andrea ; Köhler, Jan ; Lauridsen, Torben L. ; Mooij, Wolf M. ; Noordhuis, Ruurd ; Phillips, Geoff ; Rücker, Jacqueline ; Schuster, Hans Heinrich ; Søndergaard, Martin ; Teurlincx, Sven ; Weyer, Klaus van de; Donk, Ellen van; Waterstraat, Arno ; Willby, Nigel ; Sayer, Carl D. - \ 2018
Frontiers in Plant Science 9 (2018). - ISSN 1664-462X
Aquaticplants - Biomanipulation - Eutrophication - Lakerestoration - Nutrient loadreduction - PCLake - Plant traits - Regime shift
Submerged macrophytes play a key role in north temperate shallow lakes by stabilizing clear-water conditions. Eutrophication has resulted in macrophyte loss and shifts to turbid conditions in many lakes. Considerable efforts have been devoted to shallow lake restoration in many countries, but long-term success depends on a stable recovery of submerged macrophytes. However, recovery patterns vary widely and remain to be fully understood. We hypothesize that reduced external nutrient loading leads to an intermediate recovery state with clear spring and turbid summer conditions similar to the pattern described for eutrophication. In contrast, lake internal restoration measures can result in transient clear-water conditions both in spring and summer and reversals to turbid conditions. Furthermore, we hypothesize that these contrasting restoration measures result in different macrophyte species composition, with added implications for seasonal dynamics due to differences in plant traits. To test these hypotheses, we analyzed data on water quality and submerged macrophytes from 49 north temperate shallow lakes that were in a turbid state and subjected to restoration measures. To study the dynamics of macrophytes during nutrient load reduction, we adapted the ecosystem model PCLake. Our survey and model simulations revealed the existence of an intermediate recovery state upon reduced external nutrient loading, characterized by spring clear-water phases and turbid summers, whereas internal lake restoration measures often resulted in clear-water conditions in spring and summer with returns to turbid conditions after some years. External and internal lake restoration measures resulted in different macrophyte communities. The intermediate recovery state following reduced nutrient loading is characterized by a few macrophyte species (mainly pondweeds) that can resist wave action allowing survival in shallowareas, germinate early in spring, have energy-rich vegetative propagules facilitating rapid initial growth and that can complete their life cycle by early summer. Later in the growing season these plants are, according to our simulations, outcompeted by periphyton, leading to late-summer phytoplankton blooms. Internal lake restoration measures often coincide with a rapid but transient colonization by hornworts, waterweeds or charophytes. Stable clear-water conditions and a diverse macrophyte flora only occurred decades after external nutrient load reduction or when measures were combined.
Pathways for agriculture and forestry to contribute to terrestrial biodiversity conservation : A global scenario-study
Kok, Marcel T.J. ; Alkemade, Rob ; Bakkenes, Michel ; Eerdt, Martha van; Janse, Jan ; Mandryk, Maryia ; Kram, Tom ; Lazarova, Tanya ; Meijer, Johan ; Oorschot, Mark van; Westhoek, Henk ; Zagt, Roderick van der; Berg, Maurits van der; Esch, Stefan van der; Prins, Anne Gerdien ; Vuuren, Detlef P. van - \ 2018
Biological Conservation 221 (2018). - ISSN 0006-3207 - p. 137 - 150.
Agriculture - Biodiversity conservation - Forestry - Global scenarios - Sustainable development goals (SDGs) - Sustainable use
If the world stays on its current development path, the state of biodiversity will continue to decline. This is due to projected further increases in pressures, most prominently habitat loss and climate change. In order to reduce these pressures, biodiversity conservation and restoration, as well as sustainable resource use, needs to be an integral part of sustainable development strategies of primary production sectors, such as agriculture, forestry, fisheries and energy. This paper presents a model-based analysis of three alternative pathways described as Global Technology, Decentralized Solutions and Consumption Change to conserve biodiversity. Each of these pathways pursues international biodiversity goals together with a broader set of environmental sustainability objectives, including feeding the world, universal access to modern energy, limiting climate change and controlling air pollution. We show that different combinations of bio-physical measures, ecosystem management changes and behavioural changes can globally substantially reduce biodiversity loss in the coming decades (avoided Mean Species Abundance (MSA) loss is 4.4–4.8% MSA, compared to 9.5% MSA loss in the Trend), although the types of biodiversity conserved in the pathways will be different. The agricultural and forestry sectors together have until 2010 globally caused almost 60% of the total reduction in terrestrial biodiversity in MSA terms and 55% of the expected loss up to 2050. We show that increased productivity by technological improvements, increased use of ecological methods in agriculture and forestry, and consumption changes help to avoid biodiversity loss by 3.1–3.5% MSA. In addition, combinations of pathways, taking into account specific regional contexts, might result in even larger reduction of biodiversity loss. The changes needed in the agricultural and forestry sector to achieve this go well beyond current efforts to reduce their impact on biodiversity.
Het winterlicht gewas : proof off principle met komkommer
Kempkes, Frank ; Meinen, Esther ; Janse, Jan ; Elings, Anne ; Visser, Pieter de; Raaphorst, Marcel ; Vukadinovic, Danijela - \ 2018
Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Wageningen University & Research, BU Glastuinbouw rapport WPR-725) - 58
In de winter is licht in Nederland voor vrijwel alle gewassen de limiterende factor voor de productie. In de zoektocht naar het maximaal gebruik maken van het beperkte licht in de wintermaanden is het belangrijk het licht zo optimaal mogelijk om te zetten in gewasproductie. Om de mogelijkheden beter in kaart te brengen, is in aansluiting op de opgedane kennis in het project ‘Verbetering lichtinval winterlicht’, waar de lichttoetreding door het kasdek is geoptimaliseerd voor de wintermaanden. In dit project is de gewaskant aan bod gekomen. Het werk in dit project is gefinancierd door het onderzoeksprogramma Kas Als Energiebron. Dit onderzoeksprogramma is een samenwerkingsverband tussen het ministerie van Landbouw, Natuur en Voedselkwaliteit en LTO-Glaskracht Nederland. Voor maximalisatie van de lichtonderschepping is een oost-west pad richting de eerste stap. De raseigenschappen van het gekozen komkommer ras vragen door de variatie in bladafmeting tijdens de teelt van groot naar klein een adaptatie van het gewasmanagement aan de veranderende plantvorm in de tijd. Een smalle gootafstand om hier eenvoudig op in te spelen blijkt te veel gewasbeschadiging op te leveren. De beste resultaten kwamen naar voren bij de grootste gootafstand
Maintenance interventions in overweight or obese children : A systematic review and meta-analysis
Heijden, L.B. van der; Feskens, E.J.M. ; Janse, A.J. - \ 2018
Obesity Reviews 19 (2018)6. - ISSN 1467-7881 - p. 798 - 808.
Aftercare - Childhood obesity - Maintenance - Treatment
Childhood obesity is associated with significant health consequences. Although several intervention programmes for children result in weight loss or stabilization in the short-term, preventing relapse after treatment remains an important challenge. This systematic review summarizes the evidence about maintenance interventions after treatment in childhood obesity. Studies were identified by searching PubMed, Embase, Cochrane Library, Scopus, Web of Science, PsycINFO, CINAHL and SocINDEX. The primary outcome measure for this review was body mass index standard deviation score (BMI-Z-score). Data were pooled using quality effect models. Eleven studies (1,532 participants, age 2-18 years) were included, covering a wide range of maintenance approaches. Included studies varied widely in methodological quality. Pooled analysis showed that the BMI-Z-score of maintenance intervention participants remained stable, whereas control participants experienced a slight increase. No differences were observed regarding intensity and duration of therapy. A slight preference for 'face-to-face' versus 'on distance' interventions was shown. In summary, this review shows that, although there is limited quality data to recommend one maintenance intervention over another, continued treatment does have a stabilizing effect on BMI-Z-score. Considering the magnitude of the problem of childhood obesity, this is an important finding that highlights the need for further research on weight loss maintenance.
Airborne Emissions from Livestock Farms and Exposure of Nearby Residents using an Atmospheric Dispersion Model
Sterk, H.A.M. ; Swart, A.N. ; Leuken, J.P.G. van; Schijven, J.F. ; Aarnink, A.J.A. ; Wouters, I.M. ; Janse, I. ; Wichink Kruit, R.J. ; Pul, W.A.J. van - \ 2018
In: ITM 2016: Air Pullution Modeling and its Application XXV. - Springer (Springer Proceedings in Complexity ) - ISBN 9783319576442 - p. 487 - 494.
To estimate the exposure of local residents to substances emitted by livestock farms, we applied a dispersion model to calculate the air concentrations in the surroundings following from these emissions. At several livestock farms, indoor air measurements were performed to determine emission strengths, while ambient measurements were carried out to compare with model results. Measured substances were particulate matter (PM), endotoxins and micro-organisms. The dispersion model only simulated PM concentrations, which were used as a proxy to determine the dispersion concentrations of endotoxins and micro-organisms. For the living micro-organisms, the process of inactivation has to be taken into account. Here we describe the followed methodology and preliminary results.
Protein-enriched familiar foods and drinks improve protein intake of hospitalized older patients: A randomized controlled trial
Beelen, J. ; Vasse, Emmelyne ; Janssen, N. ; Janse, A. ; Roos, N.M. de; Groot, C.P.G.M. de - \ 2018
Clinical Nutrition 37 (2018)4. - ISSN 0261-5614 - p. 1186 - 1192.
Background & aims Adequate protein intake is important in preventing and treating undernutrition. Hospitalized older patients are recommended to consume 1.2–1.5 g of protein per kg body weight per day (g/kg/d) but most of them fail to do so. Therefore, we investigated whether a range of newly developed protein-enriched familiar foods and drinks were effective in increasing protein intake of hospitalized older patients. Methods This randomized controlled trial involved 147 patients of ≥65 years (mean age: 78.5 ± 7.4 years). The control group (n = 80) received the standard energy and protein rich hospital menu. The intervention group (n = 67) received the same menu with various protein-enriched intervention products replacing regular products or added to the menu. Macronutrient intake on the fourth day of hospitalization, based on food ordering data, was compared between the two groups by using Independent T-tests and Mann Whitney U-tests. Results In the intervention group 30% of total protein was provided by the intervention products. The intervention group consumed 105.7 ± 34.2 g protein compared to 88.2 ± 24.4 g in the control group (p < 0.01); corresponding with 1.5 vs 1.2 g/kg/d (p < 0.01). More patients in the intervention group than in the control group reached a protein intake of 1.2 g/kg/d (79.1% vs 47.5%). Protein intake was significantly higher in the intervention group at breakfast, during the morning between breakfast and lunch, and at dinner. Conclusions This study shows that providing protein-enriched familiar foods and drinks, as replacement of regular products or as additions to the hospital menu, better enables hospitalized older patients to reach protein intake recommendations.
Designing a sustainable and resilient production system for glasshouse strawberries
Beerling, E.A.M. ; Lotz, L.A.P. ; Leiss, K.A. ; Kruidhof, H.M. ; Evenhuis, A. ; Janse, J. ; Verkerke, W. - \ 2017
Snelle slateelt op water met leds
Janse, Jan - \ 2017
Onderzoek 2SaveEnergykas en Winterlichtkas
Janse, Jan - \ 2017
Onderzoek komkommer 2016 (2Save Energykas) en 2017 (Winterlichtkas)
Janse, Jan - \ 2017
Bloembiologie en bloemkwaliteit tomaat
Janse, Jan - \ 2017
Een sterk gewas met weinig gas
Janse, Jan - \ 2017
Onderzoek sla op water. Enkele resultaten onderzoek 2016 cabriokas
Janse, Jan - \ 2017
Jaarrond duurzame en intensieve aardbeiteelt met minder stroom. Deskstudie Kas als Energiebron
Janse, Jan - \ 2017
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