Assessing freshwater ecotoxicity of agricultural products in life cycle assessment (LCA): a case study of wheat using French agricultural practices databases and USEtox model

PurposeA life cycle assessment (LCA) was conducted on winter wheat, based on real agricultural practices databases, on a sample divided into four production scenarios. The main objectives of this study are (1) to assess the environmental impact of winter wheat, using an LCA covering field practices, and the transport and storage of grain until it is sold to a miller; (2) to use the USEtox model (Rosenbaum et al. in Int J Life Cycle Assess 13:532–546, 2008) to assess the part of the total freshwater ecotoxicity impact due to pesticide use, its variability among plots, and to identify the active ingredients with the strongest impact; (3) and with the help of fungicide, insecticide, herbicide experts, to identify active ingredients to replace these high-impact pesticides and estimate the effect of such a substitution on total freshwater ecotoxicity.Materials and methodsInVivo (the authors’ company) is a French union of agricultural cooperatives that produces and sells, amongst other products and services, decision-making tools to help farmers manage fertilization and pesticide applications. With the help of cooperatives and with the help of these tools, pedologic, climatologic and agronomic (in particular for fertilization and pesticide applications practices) data can be collected for each agricultural plot of a farm.Results and discussionThe main conclusions of this study are that : (1) when considering freshwater ecotoxicity impacts, pesticide use is predominant on the whole life cycle of winter wheat, (2) there is a huge scattering of the results observed between fields when compared to the low scattering of the results between the four production scenarios, (3) it is feasible, with the USEtox model, to identify the active ingredients with the strongest impact and to potentially decrease this average impact by 50% by substituting only three active ingredients.ConclusionsA further step to improve ecotoxicity assessment in LCA would be to develop a model to better estimate the pesticide emissions pattern on field, taking into account pedo-climatic conditions and farmers’ practices.

[1]  W. Biswas,et al.  Global warming potential of wheat production in Western Australia: a life cycle assessment , 2008 .

[2]  Gerald Rebitzer,et al.  IMPACT 2002+: A new life cycle impact assessment methodology , 2003 .

[3]  E. Barriuso,et al.  Comparative environmental impacts of glyphosate and conventional herbicides when used with glyphosate-tolerant and non-tolerant crops. , 2010, Environmental pollution.

[4]  Frank Brentrup,et al.  Methods to estimate on-field nitrogen emissions from crop production as an input to LCA studies in the agricultural sector , 2000 .

[5]  Pierre Cellier,et al.  Modelling pesticide volatilization after soil application using the mechanistic model Volt'Air , 2009 .

[6]  Tom C. J. Feijtel,et al.  Comparison between three different LCIA methods for aquatic ecotoxicity and a product environmental risk assessment , 2004 .

[7]  O. Jolliet,et al.  Toxicity assessment of the main pesticides used in Costa Rica , 2007 .

[8]  P. Barraclough,et al.  Environmental impact assessment of agricultural production systems using the life cycle assessment (LCA) methodology II. The application to N fertilizer use in winter wheat production systems , 2004 .

[9]  O. Jolliet,et al.  Life cycle impact assessment of pesticides on human health and ecosystems , 2002 .

[10]  T. E. McKone,et al.  CalTOX (registered trademark), A multimedia total exposure model spreadsheet user's guide. Version 4.0(Beta) , 2002 .

[11]  Mark A. J. Huijbregts,et al.  USEtox—the UNEP-SETAC toxicity model: recommended characterisation factors for human toxicity and freshwater ecotoxicity in life cycle impact assessment , 2008 .

[12]  O. Jolliet,et al.  Harmonisation of Environmental Life Cycle Assessment for Agriculture , 1997 .

[13]  T. Nemecek,et al.  Life Cycle Inventories of Agricultural Production Systems , 2007 .

[14]  Olivier Jolliet,et al.  Building a model based on scientific consensus for Life Cycle Impact Assessment of chemicals: the search for harmony and parsimony. , 2008, Environmental science & technology.

[15]  M. Huijbregts,et al.  Priority assessment of toxic substances in life cycle assessment. Part I: calculation of toxicity potentials for 181 substances with the nested multi-media fate, exposure and effects model USES-LCA. , 2000, Chemosphere.

[16]  M. Hauschild,et al.  PestLCI—A model for estimating field emissions of pesticides in agricultural LCA , 2006 .