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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    Required changes in nitrogen inputs and nitrogen use efficiencies to reconcile agricultural productivity with water and air quality objectives in the EU-27
    Vries, Wim de; Schulte-Uebbing, Lena - \ 2020
    Colchester, United Kingdom : International Fertiliser Society (Proceedings / International Fertiliser Society no. 842) - ISBN 9780853104797 - 40
    Nitrogen (N) losses to air, ground water and surface water in response to agricultural N inputs affect air and water quality. Agricultural N inputs in this article are defined as mineral N fertilisers, N manure and biosolids and biological N fixation. Using a spatially explicit N balance model, we assessed where agricultural N losses within THE EU-27 currently lead to an exceedance of critical ammonia (NH3) emissions in relation to adverse impacts on terrestrial ecosystems, critical N concentrations in runoff to surface water in relation to eutrophication impacts and critical nitrate
    (NO3) concentrations in groundwater in relation to drinking water quality. We then calculated the N inputs at which critical N emissions or concentrations are just not exceeded (‘critical’ N inputs). We also assessed required N inputs in order to achieve target yields, defined as 80% of the water-limited yield potential at actual N use efficiency. Actual, critical and required N inputs were calculated for c.40,000 unique soil-slope-climate combinations throughout the European Union. When actual or required N inputs exceeded critical inputs, we calculated the necessary reduction in
    ammonia emission fractions and necessary increase in NUE to attain actual or target yield while simultaneously reaching air and water quality goals. The ammonia emission fraction referred to the ratio of the total NH3-N emissions, divided by the total N excretion by livestock. Results show that required N inputs at the EU-27 level are on average 27% higher than actual inputs. Average critical N inputs are 31% and 43% lower than actual N inputs in relation to critical NH3 emissions and critical N runoff to surface water, respectively, but 1% higher in relation to critical NO3 leaching to groundwater. The risk for surface water is, however, likely overestimated, since calculated N concentrations in runoff to surface water appear to be higher than concentrations in surface water. An overall reduction in N inputs of 30% to protect air and water quality seems a reasonable average estimate. Critical inputs are most strongly exceeded in regions with high actual N inputs, such as Ireland, the Netherlands, Belgium and Luxembourg, Brittany in France and the Po valley in Italy. The actual N use efficiency (NUE) for all agricultural land, averaged over the EU-27 is 61%. This value has to increase on average to 72% to protect surface water quality at actual crop yields and to 74% at target crop yields. Opportunities thus exist to reduce the environmental impact of agriculture
    by increasing the NUE, while still allowing an increase in crop production in the EU. However, in c.15-20% of the agricultural land area, it is not feasible to achieve the surface water criterion at actual crop yield and this area increases to 25% at target crop yield, because it would require an NUE over 90%. In these areas, an additional reduction of N inputs is necessary, but this comes at the expense of crop yield reductions.
    Suspensor-derived somatic embryogenesis in Arabidopsis
    Radoeva, Tatyana ; Albrecht, Catherine ; Piepers, Marcel ; Vries, Sacco de; Weijers, Dolf - \ 2020
    Development 147 (2020)13. - ISSN 0950-1991
    Arabidopsis - Plant embryogenesis - Reprogramming - Suspensor - Totipotency

    In many flowering plants, asymmetric division of the zygote generates apical and basal cells with different fates. In Arabidopsis thaliana, the apical cell generates the embryo while the basal cell divides anticlinally, leading to a suspensor of six to nine cells that remain extra-embryonic and eventually senesce. In some genetic backgrounds, or upon ablation of the embryo, suspensor cells can undergo periclinal cell divisions and eventually form a second twin embryo. Likewise, embryogenesis can be induced from somatic cells by various genes, but the relationship with suspensor-derived embryos is unclear. Here, we addressed the nature of the suspensor to embryo fate transformation and its genetic triggers. We expressed most known embryogenesis-inducing genes specifically in suspensor cells. We next analyzed morphology and fate-marker expression in embryos in which suspensor division was activated by different triggers to address the developmental paths towards reprogramming. Our results show that reprogramming of Arabidopsis suspensor cells towards embryonic identity is a specific cellular response that is triggered by defined regulators, follows a conserved developmental trajectory and shares similarity to the process of somatic embryogenesis from post-embryonic tissues.

    Conservation in violent environments: Introduction to a special issue on the political ecology of conservation amidst violent conflict
    Marijnen, Esther ; Vries, Lotje De; Duffy, Rosaleen - \ 2020
    Political Geography (2020). - ISSN 0962-6298
    Dietary Interventions for Healthy Pregnant Women: A Systematic Review of Tools to Promote a Healthy Antenatal Dietary Intake
    Beulen, Yvette H. ; Super, Sabina ; Vries, Jeanne H.M. de; Koelen, Maria A. ; Feskens, Edith J.M. ; Wagemakers, Annemarie - \ 2020
    Nutrients 12 (2020)7. - ISSN 2072-6643
    health promotion tools - nutrition - pregnancy

    Maternal nutrition is essential for the development and lifelong health of the offspring. Antenatal care provides unique opportunities for nutrition communication, and health promotion tools (e.g., guidelines, instruments, packages, or resources) might help to overcome several concurrent barriers. We conducted a systematic literature review to map tools that are available for the promotion of a healthy dietary intake in healthy pregnant women in Western countries, and to identify what makes these tools feasible and effective for these women and their healthcare providers. Seventeen studies were included, evaluating tools with various delivery modes, content, and providers. Nine studies employed multiple, complementary delivery methods and almost all studies (n = 14) tailored the content to varying degrees, based on the individual characteristics and lifestyle behaviors of the participants. We found that the feasibility of a tool was dependent on practical issues, time investment, and providers' motivation, skills, and knowledge, while the effectiveness was related more to the type of provider and the content. Most effective interventions were provided by dietitians and nutritionists, and were highly tailored. Based on the results of this review, we believe that custom tools that are sensitive to inequalities are needed to support all women in obtaining or maintaining a healthy diet during pregnancy.

    The genetic and functional analysis of flavor in commercial tomato : the FLORAL4 gene underlies a QTL for floral aroma volatiles in tomato fruit
    Tikunov, Yury M. ; Roohanitaziani, Raana ; Meijer-Dekens, Fien ; Molthoff, Jos ; Paulo, Joao ; Finkers, Richard ; Capel, Iris ; Carvajal Moreno, Fatima ; Maliepaard, Chris ; Nijenhuis-de Vries, Mariska ; Labrie, Caroline W. ; Verkerke, Wouter ; Heusden, Adriaan W. van; Eeuwijk, Fred van; Visser, Richard G.F. ; Bovy, Arnaud G. - \ 2020
    The Plant Journal (2020). - ISSN 0960-7412
    2-phenylethanol - aroma - flavor - quantitative trait loci - Solanum lycopersicum - tomato - volatiles

    Tomato (Solanum lycopersicum L.) has become a popular model for genetic studies of fruit flavor in the last two decades. In this article we present a study of tomato fruit flavor, including an analysis of the genetic, metabolic and sensorial variation of a collection of contemporary commercial glasshouse tomato cultivars, followed by a validation of the associations found by quantitative trait locus (QTL) analysis of representative biparental segregating populations. This led to the identification of the major sensorial and chemical components determining fruit flavor variation and detection of the underlying QTLs. The high representation of QTL haplotypes in the breeders’ germplasm suggests that there is great potential for applying these QTLs in current breeding programs aimed at improving tomato flavor. A QTL on chromosome 4 was found to affect the levels of the phenylalanine-derived volatiles (PHEVs) 2-phenylethanol, phenylacetaldehyde and 1-nitro-2-phenylethane. Fruits of near-isogenic lines contrasting for this locus and in the composition of PHEVs significantly differed in the perception of fruity and rose-hip-like aroma. The PHEV locus was fine mapped, which allowed for the identification of FLORAL4 as a candidate gene for PHEV regulation. Using a gene-editing-based (CRISPR-CAS9) reverse-genetics approach, FLORAL4 was demonstrated to be the key factor in this QTL affecting PHEV accumulation in tomato fruit.

    U doet u zelf te kort als u geen kijkje neemt...
    Vries, J.W. de - \ 2020
    Handboek leeftijdsbepalingen (versie 3.0)
    Bolle, L.J. ; Hoek, R. ; Pennock-Vos, M.G. ; Beier, Ulrika ; Dijkman Dulkes, H.J.A. ; Os-Koomen, E. van; Snaar, Beanne ; Vries, M. de; Pasterkamp, T.L. ; Koelemij, E.I. ; Beintema, J.J. ; Bakker, A.G. ; Huijer, T. ; Sneekes, A.C. ; Meeren-Pido, H. van der; Wiegerinck, J.A.M. - \ 2020
    Centrum voor Visserijonderzoek (Rapport / Centrum voor Visserijonderzoek CVO rapport 20.012) - 119 p.
    Tracking digital footprints in Bonaire’s landscapes : spatial distribution and characterization of tourists on Bonaire using social media
    Slijkerman, Diana ; Wal, Jan Tjalling van der; Vries, Pepijn de; Verweij, Peter - \ 2020
    Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C052/20) - 32
    Column: Al die producten die gaan wij maken
    Vries, J.W. de - \ 2020
    Fertilisation practices on small-scale vegetable farms in Lembang, West Java : Understanding drives and barriers of farmers on the use of chicken and cattle manure
    Pronk, Annette ; Vries, Marion de; Adiyoga, Witono ; Gunadi, Nikardi ; Prathama, Mathias ; Merdeka, Agnofi E. ; Sugiharto, Joko - \ 2020
    Wageningen : Stichting Wageningen Research, Wageningen Plant Research, Business Unit Agrosystems Research (Report WPR 966) - 49
    Lerende evaluatie van het Natuurpact 2020 : Gezamenlijk de puzzel leggen voor natuur, economie en maatschappij: tweede rapportage
    Folkert, Rob ; Bouwma, Irene ; Kuindersma, Wiebren ; Hoek, Dirk-Jan van der; Gerritsen, Alwin ; Kunseler, Eva ; Buijs, Arjen ; Broekhoven, Saskia van; Knegt, Bart de; Aalbers, Carmen ; Kamphorst, Dana ; Doren, Didi van; Klaassen, Pim ; Wit-de Vries, Esther de; Roelofsen, Hans ; Agricola, Herman ; Os, Jaap van; Frissel, Joep ; Donders, Josine ; Verwoerd, Lisa ; Giesen, Paul ; Sanders, Marlies ; Goossen, Martin ; Nuesink, Nienke ; Arnouts, Rikke ; Boer, Tineke de; Dam, Rosalie van - \ 2020
    Den Haag : PBL Planbureau voor de Leefomgeving (PBL-publicatie 3852) - 183
    Informe preliminar 2: Gestión de Incendios Forestales durante COVID-19, Resultados de la encuesta
    Stoof, Cathelijne R. ; Vries, Jasper R. de; Poortvliet, Marijn ; Hannah, Bethany ; Steffens, Ron ; Moore, Peter - \ 2020
    Wageningen : [Department of Environmental Sciences, Wageningen University] - 8
    Column: Als we niets doen dan zal de natuur zelf ingrijpen
    Vries, J.W. de - \ 2020
    Making smallholder value chain partnerships inclusive : Exploring digital farm monitoring through farmer friendly smartphone platforms
    Agyekumhene, Christopher ; Vries, Jasper De; Paassen, Annemarie van; Schut, Marc ; MacNaghten, Phil - \ 2020
    Sustainability 12 (2020)11. - ISSN 2071-1050
    Collaboration - Digital agriculture - Inclusiveness - Partnerships - Smallholders - Value chains

    Value chain partnerships face difficulties achieving inclusive relations, often leading to unsustainable collaboration. Improving information flow between actors has been argued to contribute positively to a sense of inclusion in such partnership arrangements. Smallholders however usually lack the capability to use advanced communication technologies such as smartphones which offer a means for elaborate forms of information exchange. This study explores to what extent co-designing smartphone platforms with smallholders for farm monitoring contributes to smallholder ability to communicate, and how this influences smallholder sense of inclusion. The study uses an Action Design Research approach in engaging smallholders in Ghana, through multi-stakeholder and focus group discussions, in a reflexive co-design process. The research finds that co-designing a platform interface was significant in improving farmer ability to comprehend and use smartphone based platforms for communicating farm conditions and their needs with value chain partners. Farmers were however skeptical of making demands based on the platform due to their lack of power and mistrust of other actors. This highlights a need for adjusting the social and political dimensions of partnership interactions, in tandem with the advancement of digital tools, in order to effectively facilitate a sense of inclusiveness in partnerships.

    Impacts of nitrogen fertilizer type and application rate on soil acidification rate under a wheat-maize double cropping system
    Hao, Tianxiang ; Zhu, Qichao ; Zeng, Mufan ; Shen, Jianbo ; Shi, Xiaojun ; Liu, Xuejun ; Zhang, Fusuo ; Vries, Wim de - \ 2020
    Journal of Environmental Management 270 (2020). - ISSN 0301-4797
    Ammonium chloride - Cropland - Soil acidification - Soil pH - Urea

    Nitrogen (N) fertilizer-induced soil acidification in Chinese croplands is well-known, but insight in the impacts of different N fertilizer management approaches (fertilizer type and rate) on soil acidification rates is very limited. Here, we conducted a field experiment on a moderate acid soil to quantify soil acidification rates in response to N fertilization by different fertilizer types and N rates through monitoring the fate of elements (mainly nutrients) related to H+ production and consumption. Two N fertilizer types (urea and NH4Cl) and three N rates (control, optimized and conventional, 0/120/240 kg N ha−1 for wheat, 0/160/320 kg N ha−1 for maize) were included. Nitrogen addition led to an average H+ production of 4.0, 8.7, 11.4, 29.7 and 52.6 keq ha−1 yr−1, respectively, for the control, optimized urea, conventional urea, optimized NH4Cl and conventional NH4Cl plots. This was accompanied with a decline in soil base saturation of 1–10% and in soil pH of 0.1–0.7 units in the topsoil (0–20 cm). Removal of base cations by crop harvesting and N transformations contributed ~70% and ~20% to the H+ production in the urea treated plots, being ~20% and ~75% in the NH4Cl treated plots, respectively. The large NH4+ input via fertilization in the NH4Cl treated plots strongly enhanced the H+ production induced by N transformations. The low contribution of N transformations to the H+ production in the urea treated plots was due to the limited NO3 leaching, induced by the high N losses to air caused by denitrification. Increased N addition by urea, however, strongly increased H+ production by enhanced plant uptake of base cations, mainly due to a large potassium uptake in straw. Our results highlight the important role of optimizing fertilizer form and N rate as well as straw return to the field in alleviating soil acidification.

    A conceptual model for simulating responses of freshwater macroinvertebrate assemblages to multiple stressors
    Vries, Jip de; Kraak, Michiel H.S. ; Verdonschot, Piet F.M. - \ 2020
    Ecological Indicators 117 (2020). - ISSN 1470-160X
    Conceptual model - Ecological water quality - Environmental constraints - Multiple scales - Multiple stress - Response simulation

    Simulating macroinvertebrate responses to multiple environmental stressors is an important tool for water quality management, by predicting ecological effects of both stressors and restoration practices. Currently, existing modelling approaches fall short in simulating the responses of macroinvertebrate assemblages to environmental constraints, lacking incorporation of the multiple spatial and temporal scales on which stressors act, including their mutual interactions and uncertainties associated with input data. In answer to these shortcomings, this study aimed to design a conceptual multiscale model for simulating responses of macroinvertebrate assemblages to multiple environmental stressors. To this purpose, we drew up model requirements, selected model building blocks and assembled these into a conceptual model, also documenting the challenges that remain to be solved. This conceptual model offers a direction for simulating responses of macroinvertebrate assemblages to multiple stressors, which in turn can be used to better focus management resources and restoration practices.

    Samenhang Klimaatakkoord en natuurbeleid : Proces en implementatie van het Klimaatakkoord door provincies en maatschappelijke partijen en de potentiële effecten op biodiversiteitsdoelen van de Vogel- en Habitatrichtlijn
    Knegt, B. de; Pleijte, M. ; Wit-de Vries, E. de; Bouwma, I. ; Kistenkas, F. ; Nieuwenhuizen, W. - \ 2020
    Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 179) - 78
    The aim of this project was to identify how the National Climate Agreement ties in with nature policy. The results show that the provincial governments and other parties look to ‘piggyback’ onto other, existing policies when implementing the National Climate Agreement, and that effectively embedding climate policy into other policies and existing policy instruments poses a real challenge. The potential impact of implementing climate policy measures on biodiversity depends on the detail (location, design and management). Greater coherence between nature and climate policies can be achieved by aligning plans for the delivery of the National Climate Agreement and nature policy more closely with each other’s objectives.
    Column: Onze koppositie behouden, dan niet langer toekijken maar meedoen...!
    Vries, J.W. de - \ 2020
    Column: U zou bij ons de drempels uit de deuren moeten lopen .... zodra het weer mag dan!
    Vries, J.W. de - \ 2020
    Realisatie Natuurnetwerk door provincies : Achtergrondstudie bij de Tweede Lerende Evaluatie Natuurpact
    Kuindersma, W. ; Doren, D. ; Arnouts, R.C.M. ; Kamphorst, D.A. ; Nuesink, J.G. ; Wit-de Vries, E. de - \ 2020
    Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 174) - 164
    This report contains an analysis of four provincial strategies for realising the national ecological network: (1) private conservation; (2) area-based processes; (3) monitoring and enforcement; (4) buffer zone policy. The study was carried out for the Second Reflexive Evaluation of the Nature Pact by the Netherlands Environmental Assessment Agency (PBL) and Wageningen University & Research (WUR). We investigated the expectations for and results of these strategies during the period from 2011 to 2019. Initially the provincial governments had high expectations of the private conservation strategy for the establishment of new nature by farmers and private individuals. In practice this proved to be much more difficult than anticipated, particularly for farmers. Much new nature is established in area-based processes, which are now more sectoral in approach than they were in the past. Although these processes are often based on voluntary action, the provinces are increasingly turning to full compensation and land expropriation, particularly to meet obligations under EU legislation. Monitoring and enforcement in conservation management and a policy of establishing buffer zones around the national ecological network are relatively new strategies and little practical experience has yet been gained with them.
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