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dc.contributor.author
de Paepe, Josefina
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dc.contributor.author
Aradvari Horvat, S. M.
dc.contributor.author
Alvarez, Roberto
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dc.date.available
2022-06-24T10:57:31Z
dc.date.issued
2022-05
dc.identifier.citation
de Paepe, Josefina; Aradvari Horvat, S. M.; Alvarez, Roberto; Inclusion of soil organic carbon changes can reverse results of historical energy flux quantifications of Pampean agriculture; Elsevier Science; Science of the Total Environment; 835; 5-2022; 1-10
dc.identifier.issn
0048-9697
dc.identifier.uri
http://hdl.handle.net/11336/160437
dc.description.abstract
The questions that guided this work were: 1) How do energy inputs, outputs, and energy indices evolve during the last four decades along the rainfall gradient of the Pampas, 2) How does present agrochemical and fertilizer use in Argentina resemble, or differ, from other main grain producing regions with large no-till surfaces?, and 3) How do energy fluxes vary when soil organic carbon (SOC) changes during the last four decades are included? Energy balances (outputs – inputs), energy efficiencies (outputs/inputs) and energy intensities (inputs/yield) were calculated. Inputs comprised agrochemicals and fertilizers, machinery used for soil tillage and fuel use and gathered from different information sources. Outputs included yield of main crops from national statistics. Calculations were performed for four areas along a rainfall gradient during the 1970–2015 period. Energy coefficients were collected from literature. Soil organic carbon changes of the upper soil profile meter were available from a previous publication. Total input averages per area were low although increased 62% after four decades, from 6.6 GJ ha−1 in the past up to 10.5 GJ ha−1 at present with no marked differences between areas. Agrochemicals comprised 49% of total energy input, a very large proportion compared to other regions mainly related to the large surface under no-tillage while fertilizer rates were low. Average energy outputs increased 51% with time and all energy balances were positive. Energy efficiencies had an optimum during 1995 of 4.8 decreasing afterwards down to 3.7. Energy intensities decreased and at present 14% less input energy was needed per t DM yield produced. Two areas gained SOC and one lost large amounts. Inclusion of SOC losses in energy quantifications turned all energy indices to negative values therefore providing a real scenario of what happened with energy fluxes after four decades of agriculture which otherwise would be ignored.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINE PAMPAS
dc.subject
ENERGY BALANCES
dc.subject
RAINFALL GRADIENT
dc.subject
SOIL ORGANIC CARBON
dc.subject.classification
Agricultura
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dc.subject.classification
Agricultura, Silvicultura y Pesca
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
Inclusion of soil organic carbon changes can reverse results of historical energy flux quantifications of Pampean agriculture
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-06-21T18:32:56Z
dc.journal.volume
835
dc.journal.pagination
1-10
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: de Paepe, Josefina. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Aradvari Horvat, S. M.. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
dc.description.fil
Fil: Alvarez, Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
dc.journal.title
Science of the Total Environment
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.scitotenv.2022.155533
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0048969722026298
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