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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    New insights on the estimation of the anaerobic biodegradability of plant material : Identifying valuable plants for sustainable energy production
    Pabón-Pereira, Claudia P. ; Hamelers, H.V.M. ; Matilla, Irene ; Lier, Jules B. van - \ 2020
    Processes 8 (2020)7. - ISSN 2227-9717
    Anaerobic digestion - Biodegradability - Fiber degradation - Lignocellulosics

    Based on fifteen European plant species, a statistical model for the estimation of the anaerobic biodegradability of plant material was developed. We show that this new approach represents an accurate and cost-eective method to identify valuable energy plants for sustainable energy production. In particular, anaerobic biodegradability (Bo) of lignocellulosic material was empirically found to be related to the amount of cellulose plus lignin, as analytically assessed by the van Soest method, i.e., the acid detergent fiber (ADF) value. Apart from being theoretically meaningful, the ADF-based empirical model requires the least eort compared to the other four proposed conceptual models proposed, as individual fractions of cellulose, hemicellulose, and lignin do not need to be assessed, which also enhances the predictive accuracy of the model's estimation. The model's results showed great predictability power, allowing us to identify interesting crops for sustainable crop rotations. Finally, the model was used to predict Bo of 114 European plant samples that had been previously characterized by means of the van Soest method.

    'Added value of diffuse light must prove itself in next few years'. Range of options for scattering light
    Hemming, Silke - \ 2020
    'Kansen voor nieuw verdienmodel'
    Visser, Chris de - \ 2020
    Bestuiving blauwe bes - Bloemranden goed voor biodiversiteit
    Groot, Arjen de - \ 2019

    Bloemstroken langs blauwebessenpercelen trekken een diversiteit aan bestuivers aan. Ze vergroten daarmee de biodiversiteit. Dat blijkt it de eerste resultaten van het praktijknetwerk; Bloemranden langs blauwe bes, waaraan vijf blauwebessenbedrijven meedoen. Effecten op opbrengst, kwaliteit en vruchtmaat zijn echter nog niet zichtbaar.

    Schoonmaakdilemma's: moet een vieze wc-borstel vervangen en hoe vaak verschoon je je lakens?
    Zwietering, Marcel - \ 2019
    Gele en blauwe vangplaten functioneren niet altijd optimaal
    Tol, Rob van - \ 2019

    Hoe zien Calofornische trips en de behaarde wants hun omgeving en hoe kan deze kennis worden ingezet om een beter zichtbare en aantrekkelijker val te creëren? Die vraag staat centraal in een onderzoek door Wageningen plant Research, met als doel de monitoring te verbeteren en meer plaaginsecten te kunnen wegvangen. De eerste onderzoeksresultaten tonen aan dat meer kennis over wat plaaginsecten daadwerkelijk zien inderdaad mogelijkheden biedt om efficiëntere vallen te ontwikkelen.

    A sustainability assessment of bioethanol (EtOH) production: The case of cassava in Colombia
    Pabon-Pereira, Claudia ; Slingerland, Maja ; Hogervorst, Sanna ; Lier, Jules van; Rabbinge, Rudy - \ 2019
    Sustainability 11 (2019)14. - ISSN 2071-1050
    Bioenergy production - Bioethanol - Biofuels - Cassava - Energy crops - Sustainability analysis

    This paper shows how system design determines sustainability outcomes of cassava bioethanol production in Colombia. The recovery of the energy contained in by-products is recommended as compared to single product production. In particular, this study assesses the energy, greenhouse gases, water, and land use performance of alternative cassava cascades working at different scales, highlighting the implications of including anaerobic digestion technology in the chain. The centralized systems showed a poorer energy and greenhouse gases performance as compared to decentralized ones in part due to the artificial drying of cassava chips in the centralized facility. Under solar drying of cassava chips, systems with anaerobic digestion produced three to five times more energy than demanded and produced greenhouse gas savings of 0.3 kgCO2eq L EtOH-1. The water balance output depends upon the water reuse within the ethanol industry, which demands 21-23 L EtOH-1. In the anaerobic digestion scenarios, assuming liquid flows are treated separately, complete water recovery is feasible. Land use for cassava cultivation was calculated to be 0.27-0.35 ha tEtOH-1. The energy and water content of the material to digest, the options for digestate reuse, and the recovery of the methane produced are major considerations substantially influencing the role of anaerobic digestion within cassava cascade configurations.

    Intercropping simulation using the SWAP model: Development of a 2x1D algorithm
    Pinto, Victor Meriguetti ; Dam, Jos C. van; Jong van Lier, Quirijn de; Reichardt, Klaus - \ 2019
    Agriculture 9 (2019)6. - ISSN 2077-0472
    Intercropping modeling - Lateral water flux - Radiation sharing - SWAP

    Intercropping is a common cultivation system in sustainable agriculture, allowing crop diversity and better soil surface exploitation. Simulation of intercropped plants with integrated soil-plant-atmosphere models is a challenging procedure due to the requirement of a second spatial dimension for calculating the soil water lateral flux. Evaluations of more straightforward approaches for intercrop modeling are, therefore, mandatory. An adaptation of the 1D model Soil, Water, Atmosphere and Plant coupled to the World Food Studies (SWAP/WOFOST) to simulate intercropping (SWAP 2x1D) based on solar radiation and water partitioning between plant strips was developed and the outcomes are presented. An application of SWAP 2x1D to maize-soybean (MS) strip intercropping was evaluated against the monocropping maize (M) and soybean (S) simulated with the 1D model SWAP/WOFOST, and a sensitivity analysis of SWAP 2x1D was carried out for the intercropping MS. SWAP 2x1D was able to simulate the radiation interception by both crops in the intercropping MS and also to determine the effect of the radiation attenuation by maize on soybean plants. Intercropped plants presented higher transpiration and resulted in lower soil evaporation when compared to their equivalent monocropping cultivation. A numerical issue involving model instability caused by the simulated lateral water flux in the soil from one strip to the other was solved. The most sensitive plant parameters were those related to the taller plant strips in the intercropping, and soil retention curve parameters were overall all significantly sensitive for the water balance simulation. This implementation of the SWAP model presents an opportunity to simulate strip intercropping with a limited number of parameters, including the partitioning of radiation by a well-validated radiation sharing model and of soil water by simulating the lateral soil water fluxes between strips in the 2x1D environment.

    Onderzoeksresultaten maken weg vrij voor recirculatie in cymbidium. Probleem natriumgevoeligheid minder groot dan telers dachten
    Kromwijk, J.A.M. - \ 2019
    ‘Beperkte scope’ natuurlijke vijanden vraagt om geïntegreerde actie. Positieve neveneffecten breedwerkende groene middelen.
    Messelink, G.J. ; Douma, Jenette - \ 2019
    Nieuwe simulatietool ontwikkeld voor praktijk en onderwijs. Katalysator voor uitrol Het Nieuwe Telen
    Swinkels, G.L.A.M. ; Helm, Frank van der; Boedijn, Alexander - \ 2019
    Water stress permanently alters shoot architecture in common bean plants
    Durigon, Angelica ; Evers, Jochem ; Metselaar, Klaas ; Jong van Lier, Quirijn de - \ 2019
    Agronomy 9 (2019)3. - ISSN 2073-4395
    Dummy-variable regression - Functional-structural plant modeling - Phyllochron - Plant development - Plant organ

    The effects of water stress on crop yield through modifications of plant architecture are vital to crop performance such as common bean plants. To assess the extent of this effect, an outdoor experiment was conducted in which common bean plants received five treatments: fully irrigated, and irrigation deficits of 30% and 50% applied in flowering or pod formation stages onwards. Evapotranspiration, number and length of pods, shoot biomass, grain yield and harvest index were assessed, and architectural traits (length and thickness of internodes, length of petioles and petiolules, length and width of leaflet blades and angles) were recorded and analyzed using regression models. The highest irrigation deficit in the flowering stage had the most pronounced effect on plant architecture. Stressed plants were shorter, leaves were smaller and pointing downward, indicating that plants permanently altered their exposure to sunlight. The combined effect of irrigation deficit and less exposure to light lead to shorter pods, less shoot biomass and lower grain yield. Fitted empirical models between water deficit and plant architecture can be included in architectural simulation models to quantify plant light interception under water stress, which, in turn, can supply crop models adding a second order of water stress effects on crop yield simulation.

    Bevorderen van nestgelegenheid voor wilde bijen op landgoed De Lage Lier
    Scheper, J.A. ; Reemer, Menno ; Roessink, I. - \ 2018
    Wageningen University & Research - 13 p.
    A matric flux potential approach to assess plant water availability in two climate zones in Brazil
    Pinheiro, Everton Alves Rodrigues ; Jong van Lier, Quirijn de; Metselaar, Klaas - \ 2018
    Vadose Zone Journal 17 (2018)1. - ISSN 1539-1663

    Predicting soil water availability to plants is important for agricultural and ecological models. Models that explicitly take into account root water uptake and transpiration reduction describe the ability of soil to supply water to plants based on soil hydraulic properties that depend on soil water content. The objective of this study was to further develop an existing single-layer root water uptake model based on matric flux potential to allow for multi-layer scenarios; and to illustrate its functionality using soil hydraulic properties from layered soils from two climate zones in Brazil: a semiarid zone and a humid zone. For each soil layer, the hydraulic properties were determined by inverse modeling of laboratory evaporation experiment data available for pressure heads between −165 and −1.5 m. The water supplying capacities of soils were evaluated using the newly developed multi-layer root water uptake model. Soils from the semiarid zone were able to supply water to plants over a wider range of pressure heads. Soils from the humid zone showed slightly stronger hydraulic restrictions for supplying transpirable water. For the analyzed soils, only a negligible increase in available water results from decreasing the root water potential below −150 m. Therefore, based on this analysis, it is reasonable to expect plant adaptation to move toward an increase of root length density rather than to a decrease of minimum root water potential.

    Effect diffuus licht bij groentegewassen
    Janse, J. - \ 2018
    Effecten van Na bij tomaat recirculatie Onderzoeksresultaten 2017
    Voogt, W. ; Leih, Romain ; González, Jorge M. - \ 2018
    Phylogenetic (un)relatedness of plant-parasitic nematodes & update on genome sequencing
    Helder, Hans - \ 2018
    Biomethane from industrial and municipal wastewater
    Eekert, Miriam H.A. van; Zeeman, Grietje - \ 2017
    In: Microbial Fuels CRC Press - ISBN 9781498763790 - p. 47 - 76.

    Remains of drainage systems to remove waste and latrines have been found in houses from the Mesopotamian Empire (3500-2500 BC); ancient Rome had its Cloaca Maxima, and there still exists a working 4000-year-old sewer system in Greece. Nevertheless, it was not until the late nineteenth century, and after a fourteenth-century long dark age, that it was recognized that municipal waste water needs to be removed from its origin and treated to prevent the outbreak of diseases (Lofrano and Brown 2010). Until then, wastewater had been discharged in surface water or so-called “night soil” (toilet waste) and collected and used for fertilization. Later, in the early twentieth century, biological oxygen demand (BOD) was introduced as a measure of pollution and the first wastewater treatment systems were installed. Recently, the recovery of nutrients, reuse of water, production of intermediates, and generation of energy have become important incentives for the treatment of wastewater from both industrial and municipal origins. This may be more feasible through separation at the source and improved design of water usage and treatment systems (Guest et al. 2009; Larsen et al. 2009). Aerobic treatment was and still is the main technology used for the treatment of municipal wastewater in the north and cold climate areas. In the twentieth century, the possible application of anaerobic systems for the treatment of industrial wastewater and municipal wastewater in warmer climates was recognized after the development of the upflow anaerobic sludge bed (UASB) system in Wageningen in the 1970s (Lettinga 2014; van Lier et al. 2015). Nowadays, with new treatment designs and the paradigm shift toward seeing wastewater as a source of valuable resources, the application of anaerobic technology may be expanded toward treating municipal sewage in cold climates as well. Anaerobic treatment has its advantages, for example, lower excess sludge production, high applicable loadings, and lower energy demands, combined with biogas production. Initially, those were the reasons for the application of anaerobic treatment. Nowadays, the fact that nutrients (N and P) are not destroyed (e.g., emitted as N2) but released as recoverable ions is considered an additional advantage, since this facilitates recovery. Therefore, anaerobic technology has a central role in existing and newly developed waste treatment systems (Figure 3.1). It is, however, important to consider that in most cases, posttreatment of anaerobic effluent is warranted to guarantee that limits for safe discharge of the effluent are met (von Sperling and de Lemos Chrenicharo 2002).

    LED belichting in tomaat: ervaringen
    Dieleman, Anja - \ 2017
    Within, Above, and Beyond : Churches and Religious Civil Society Activism in South Kivu
    Aembe, Bwimana ; Jordhus-Lier, David - \ 2017
    Journal of Civil Society 13 (2017)2. - ISSN 1744-8689 - p. 149 - 165.
    advocacy - Civil society - Democratic Republic of Congo - faith-based organizations - peacebuilding

    In South Kivu in the Eastern part of the Democratic Republic of Congo (DRC), various church actors have chosen to involve in advocacy and mobilization through a formalized civil society structure known as La Société Civile (LSC). In this article, we explore the relationship between the churches and civil society in Eastern DRC, paying particular attention to why this cooperation has taken such a formalized expression, the motivations of church actors to become involved in LSC and, finally, how this relationship between different civil society actors has underpinned various peacebuilding efforts at the local, provincial, and national scale.

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