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A long-term sustainability assessment of an Argentinian agricultural system based on emergy synthesis

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  • Ferraro, D.O.
  • Benzi, P.

Abstract

By tracking the different flows of emergy (the total amount of solar energy that was directly or indirectly required in a production process) it is possible to account for all environmental work previously involved in generating a resource, product or service. This donor-side perspective for environmental assessment has the advantage over usual economic and energy analysis in the ability to value renewable and non-renewable environmental resource inputs both from the economy (purchased resources) and from nature (free resources) and compute their values on a common basis. On this basis, this paper presents the use of emergy synthesis on three cropping systems of the Pampa Region (Argentina) with the aim of evaluating the long-term trends (1984–2010) in emergy use and the effect of the adoption of new technologies in the study area. The cropping systems evaluated were wheat/soybean double cropping (W/S); maize (M), and spring soybean (S). Results form the emergy synthesis showed that the cropping systems studied were not only more productive but also more efficient over time. The range of the observed values for the emergy yield ratio (EYR) were 1.77–5.59, proving that the three cropping systems are considerably supported by renewable and locally available resources. The environmental load ratio (ELR) that represents the ratio between non-renewable and renewable resource inputs ranged between 0.3 and 1.43, a significant lower range compared to other extensive cropping systems. However, when inspecting the temporal dynamics of the emergy indicators, M and W/S showed a statistically significant optimum behavior, with the most favorable values just before the use of a more intensive cropping management represented by the use of genetically modified cultivars, the no-tillage adoption and the more frequent use of fertilizers at higher doses. By the time of these adoptions, both the EYR and ELR showed a breakpoint in their temporal dynamic, exhibiting a negative slope during the last years of the time series. Although the observed ranges of the emergy indicators can place these production systems among the most efficient and with the lower environmental impact, the negative trend in the emergy indicators shown in recent years constitutes a risky scenario in terms long-term sustainability.

Suggested Citation

  • Ferraro, D.O. & Benzi, P., 2015. "A long-term sustainability assessment of an Argentinian agricultural system based on emergy synthesis," Ecological Modelling, Elsevier, vol. 306(C), pages 121-129.
    • Handle: RePEc:eee:ecomod:v:306:y:2015:i:c:p:121-129
    DOI: 10.1016/j.ecolmodel.2014.06.016
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    5. Virginia, Aparicio & Zamora, Martín & Barbera, Agustín & Castro-Franco, Mauricio & Domenech, Marisa & De Gerónimo, Eduardo & Costa, José Luis, 2018. "Industrial agriculture and agroecological transition systems: A comparative analysis of productivity results, organic matter and glyphosate in soil," Agricultural Systems, Elsevier, vol. 167(C), pages 103-112.
    6. Yun Liu & Johan Afendi Bin Ibrahim & Yen Sin Foo, 2024. "Emergy-Based Evaluation of the Sustainability of Agricultural Ecosystem in Dazhou, China, from 2002 to 2022," Sustainability, MDPI, vol. 16(21), pages 1-16, October.
    7. Chen, Wei & Liu, Wenjing & Geng, Yong & Brown, Mark T. & Gao, Cuixia & Wu, Rui, 2017. "Recent progress on emergy research: A bibliometric analysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 1051-1060.
    8. Ajun Wan & Xiaolei Qi & Weidong Yue & Runqiu Tu, 2022. "Construction and case verification of rural environmental value-added evaluation system," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 24(2), pages 1781-1797, February.

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