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 value of manure - Manure as co-product in life cycle assessment
Leip, Adrian ; Ledgard, Stewart ; Uwizeye, Aimable ; Palhares, Julio C.P. ; Aller, M.F. ; Amon, Barbara ; Binder, Michael ; Cordovil, Claudia M.D.S. ; Camillis, Camillo De; Dong, Hongming ; Fusi, Alessandra ; Helin, Janne ; Hörtenhuber, Stefan ; Hristov, Alexander N. ; Koelsch, Richard ; Liu, Chunjiang ; Masso, Cargele ; Nkongolo, Nsalambi V. ; Patra, Amlan K. ; Redding, Matthew R. ; Rufino, Mariana C. ; Sakrabani, Ruben ; Thoma, Greg ; Vertès, Françoise ; Wang, Ying - \ 2019
Journal of Environmental Management 241 (2019). - ISSN 0301-4797 - p. 293 - 304.
Livestock production is important for food security, nutrition, and landscape maintenance, but it is associated with several environmental impacts. To assess the risk and benefits arising from livestock production, transparent and robust indicators are required, such as those offered by life cycle assessment. A central question in such approaches is how environmental burden is allocated to livestock products and to manure that is re-used for agricultural production. To incentivize sustainable use of manure, it should be considered as a co-product as long as it is not disposed of, or wasted, or applied in excess of crop nutrient needs, in which case it should be treated as a waste. This paper proposes a theoretical approach to define nutrient requirements based on nutrient response curves to economic and physical optima and a pragmatic approach based on crop nutrient yield adjusted for nutrient losses to atmosphere and water. Allocation of environmental burden to manure and other livestock products is then based on the nutrient value from manure for crop production using the price of fertilizer nutrients. We illustrate and discuss the proposed method with two case studies.
What does Life-Cycle Assessment of agricultural products need for more meaningful inclusion of biodiversity?
Teillard, Félix ; Maia de Souza, Danielle ; Thoma, Greg ; Gerber, Pierre J. ; Finn, John A. - \ 2016
Journal of Applied Ecology 53 (2016)5. - ISSN 0021-8901 - p. 1422 - 1429.
agricultural production systems - conservation - environmental assessment methods - environmental impact - food products - life-cycle assessment (LCA) - livestock - off-farm impact - policy - sustainable agriculture

Decision-makers increasingly use life-cycle assessment (LCA) as a tool to measure the environmental sustainability of products. LCA is of particular importance in globalized agricultural supply chains, which have environmental effects in multiple and spatially dispersed locations. Incorporation of impacts on biodiversity that arise from agricultural production systems into environmental assessment methods is an emerging area of work in LCA, and current approaches have limitations, including the need for (i) improved assessment of impacts to biodiversity associated with agricultural production, (ii) inclusion of new biodiversity indicators (e.g. conservation value, functional diversity, ecosystem services) and (iii) inclusion of previously unaccounted modelling variables that go beyond land-use impacts (e.g. climate change, water and soil quality). Synthesis and applications. Ecological models and understanding can contribute to address the limitations of current life-cycle assessment (LCA) methods in agricultural production systems and to make them more ecologically relevant. This will be necessary to ensure that biodiversity is not neglected in decision-making that relies on LCA.

Greenhouse gas mitigation in animal production: towards an integrated life cycle sustainability assessment.
Boer, I.J.M. de; Cederberg, C. ; Eady, S. ; Gollnow, S. ; Kristensen, T. ; Macleod, M. ; Meul, M. ; Nemecek, T. ; Phong, L.T. ; Thoma, G. ; Werf, H.M.G. ; Williams, A.G. ; Zonderland-Thomassen, M.A. - \ 2011
Current Opinion in Environmental Sustainability 3 (2011)5. - ISSN 1877-3435 - p. 423 - 431.
nitrous-oxide emissions - dairy-cows - production systems - ruminal microorganisms - environmental-impact - carbon sequestration - livestock production - agricultural soils - milk-production - linseed oil
The animal food chain contributes significantly to emission of greenhouse gases (GHGs). We explored studies that addressed options to mitigate GHG emissions in the animal production chain and concluded that most studies focused on production systems in developed countries and on a single GHG. They did not account for the complex interrelated effects on other GHGs or their relation with other aspects of sustainability, such as eutrophication, animal welfare, land use or food security. Current decisions on GHG mitigation in animal production, therefore, are hindered by the complexity and uncertainty of the combined effect of GHG mitigation options on climate change and their relation with other aspects of sustainability. There is an urgent need to integrate simulation models at animal, crop and farm level with a consequential life cycle sustainability assessment to gain insight into the multidimensional and sometimes conflicting consequences of GHG mitigation options. Highlights ¿ Most studies that address options to mitigate greenhouse gas (GHG) emissions in the animal production focus on systems in developed countries and on a single GHG. ¿ Current decisions on GHG mitigation in animal production are hindered by the complexity and uncertainty of the combined effect of GHG mitigation options on climate change and their relation with other aspects of sustainability. ¿ There is an urgent need to integrate simulation models at animal, crop and farm level with a consequential life cycle sustainability assessment to gain insight into the multidimensional and sometimes conflicting consequences of GHG mitigation options.
Inventarisatie toepassingsmogelijkheden AutoMaatje van Thoma BV in de bloembollenteelt. Schaalvergroting met behoud van kwaliteit
Hazelaar, W.J.M. - \ 2007
Lisse : PPO Bloembollen (Rapport / PPO-Bloembollen PPO 709) - 31 p.
Het telen van een goed product vraagt veel aandacht en tijd, vooral wanneer dit op duurzame wijze dient te gebeuren. Markt en toegenomen kosten (met name grond en arbeid) eisen optimale inzetbaarheid van productiemiddelen waardoor schaalvergroting toeneemt. Werkzaamheden worden op steeds grotere schaal, sneller en minder nauwkeurig uitgevoerd met risico op verlies van productkwaliteit en opbrengst. Tijdrovende werkzaamheden (voorbeeld hiervan zijn het ziek zoeken en onkruid wieden), worden vervangen door op korte termijn effectievere maatregelen of ze worden zelfs achterwege gelaten, met het risico van een kwalitatief minder product, een slechtere bodemstructuur en een minder duurzame bedrijfsvoering. De mens bij eenvoudige, maar arbeidsintensieve handelingen vervangen door een robot kan de teler/ondernemer helpen bij een goede arbeidsverdeling. Bovendien geeft het de ondernemer tijd om zelf meer kennisintensieve werkzaamheden uit te voeren. Dit kan door het inzetten van het AutoMaatje, een voertuig dat in combinatie met andere werktuigen zelfstandig gewasbewerkingen kan uitvoeren. In dit rapport (31 pag.; PPO nr. 709; ¿ 15,-)wordt ingegaan op de bijdrage die het AutoMaatje kan leveren aan een duurzamere bollenteelt. Na een korte introductie van het concept AutoMaatje, worden arbeid & planning, bodemstructuur, gewas(product)kwaliteit en milieu besproken. Hieruit blijken de algemene voor- en nadelen die het AutoMaatje kan hebben in de bollenteelt. Vervolgens is in het hoofdstuk `bewerkingen¿ een overzicht gemaakt van de werkzaamheden die door het AutoMaatje, in combinatie met aanvullende applicaties, kunnen worden uitgevoerd. Er is gekeken naar de huidige en toekomstige mogelijkheden. Ook is met behulp van berekeningen de economische haalbaarheid geïllustreerd. Het AutoMaatje is rendabel bij inzet vanaf 15 hectare. In dit rapport wordt in eerste instantie ingegaan op de toepassingsmogelijkheden in de bollenteelt. Het AutoMaatje is echter ook inzetbaar in andere open teelten.
The carrot extracellular lipid transfer protein EP2: quantitative aspects with respect to its putative role in cutin synthesis.
Hendriks, T. ; Meijer, E.A. ; Thoma, S. ; Kader, J.C. ; Vries, S.C. de - \ 1994
In: NATO ASI Series, Vol. H 81, Plant Molecular Biology / Coruzzi, G., Puigdomènech, P., Berlin/Heidelberg : Springer Verlag - p. 85 - 94.
Tissue-specific, and wound-induced, expression of a gene encoding a cell wall-localized lipid transfer protein from Arabidopsis.
Thoma, S. ; Hecht, U. ; Kippers, A. ; Vries, S.C. de; Botella, J. ; Sommerville, C. - \ 1994
Plant Physiology 105 (1994). - ISSN 0032-0889 - p. 35 - 45.
Optimal decisionmaking or optimal trouble-shooting?
Hofstede, G.J. ; Beulens, A.J.M. - \ 1991
In: Proc. 1st Conf. IFIP TC 7.6 Optimization-based computer-aided modelling & design, A.J.M. Beulens, H.-J. Sebastian (eds.). The Hague. Lect. Notes Control & Inform. Sci. 174, M. Thoma, A. Wyner (eds.). Springer-Verlag, Berlin - p. 126 - 138.
Towards a better understanding of the model concept in the context of information systems development.
Hartog, R.J.M. ; Meijs, C.A.J. - \ 1991
In: Proc. 1st Conf. IFIP TC 7.6 Optimization-based computer-aided modelling & design, A.J.M. Beulens, H.-J. Sebastian (eds.). The Hague. Lect. Notes Control & Inform. Sci. 174, M. Thoma, A. Wyner (eds.). Springer-Verlag, Berlin - p. 84 - 95.
Effects of auxins and cytokinins on epigenetic instability of callus propagated Kalanchoe blossfeldiana Poelln.
Varga, A. ; Thoma, L.H. ; Bruinsma, J. - \ 1989
Plant Cell, Tissue and Organ Culture: an international journal on in vitro culture of higher plants 15 (1989). - ISSN 0167-6857 - p. 223 - 231.
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