A regional audit of nitrogen fluxes in pampean agroecosystems

Calculations of nitrogen (N) budgets can help in the understanding of agroecosystem functioning and in proposing more sustainable management strategies. Changes in the main N fluxes of the pampean agroecosystems of Argentina were calculated over time. The impact of management changes on regional N b...

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Detalles Bibliográficos
Autores: Alvarez, Roberto, Steinbach, Haydée, de Paepe, Josefina
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/15706
Acceso en línea:http://hdl.handle.net/11336/15706
Access Level:acceso abierto
Palabra clave:Balance de Nitrógeno
Fijación de Nitrógeno
Productividad Parcial
Región Pampeana
https://purl.org/becyt/ford/4.1
https://purl.org/becyt/ford/4
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spelling A regional audit of nitrogen fluxes in pampean agroecosystemsAlvarez, RobertoSteinbach, Haydéede Paepe, JosefinaBalance de NitrógenoFijación de NitrógenoProductividad ParcialRegión Pampeanahttps://purl.org/becyt/ford/4.1https://purl.org/becyt/ford/4Calculations of nitrogen (N) budgets can help in the understanding of agroecosystem functioning and in proposing more sustainable management strategies. Changes in the main N fluxes of the pampean agroecosystems of Argentina were calculated over time. The impact of management changes on regional N budget and possible future trends were estimated. Changes in land use were quantified using national censuses data. Biological N fixation of leguminous forages was assessed using a regression model and local field experimental data. Nitrogen fixation by soybean, the most extensive grain crop, was calculated using an existing model. Fertilizer input was based upon farmer surveys, and atmospheric N input estimated using local data. Nitrogen output by grain harvest was estimated using national yield statistics and averaged grain N concentration derived from many field experiments widespread over the region. During the last 50 years cropped area has doubled as a result of the widespread adoption of soybean as the main component of rotations. The agricultural expansion included areas previously used for grazing on seeded pastures and seasonal graminaceus forages. The historical N budget of the entire region was positive but has dropped from 2.0 Mt y−1 in 1960 to 1.3 Mt y−1 at present. This reduction implies that N fixation by soybean and fertilizer application were lower than the previous livestock/pasture systems N input. During the cropping phase of rotations the N budget was usually negative in the past. Currently, in low yielding areas of semiarid environments, the N budget turned positive; meanwhile in humid climates with high productivity scenarios it remained negative. Fertilizer rates applied balanced N output in the former case but not in the latter. Partial factor productivity of N inputs increased from 3- to 6-fold during the last 50 years in the Pampas. Uncertainties related to the estimations performed are discussed.Fil: Alvarez, Roberto. Universidad de Buenos Aires. Facultad de Agronomia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario; ArgentinaFil: Steinbach, Haydée. Universidad de Buenos Aires. Facultad de Agronomia; ArgentinaFil: de Paepe, Josefina. Universidad de Buenos Aires. Facultad de Agronomia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario; ArgentinaElsevier2014-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/15706Alvarez, Roberto; Steinbach, Haydée; de Paepe, Josefina; A regional audit of nitrogen fluxes in pampean agroecosystems; Elsevier; Agriculture, Ecosystems And Environment; 184; 1-2014; 1-80167-8809enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0167880913003873info:eu-repo/semantics/altIdentifier/doi/10.1016/j.agee.2013.11.003info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:21:47Zoai:ri.conicet.gov.ar:11336/15706instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982024-05-08 14:21:47.319CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A regional audit of nitrogen fluxes in pampean agroecosystems
title A regional audit of nitrogen fluxes in pampean agroecosystems
spellingShingle A regional audit of nitrogen fluxes in pampean agroecosystems
Alvarez, Roberto
Balance de Nitrógeno
Fijación de Nitrógeno
Productividad Parcial
Región Pampeana
https://purl.org/becyt/ford/4.1
https://purl.org/becyt/ford/4
title_short A regional audit of nitrogen fluxes in pampean agroecosystems
title_full A regional audit of nitrogen fluxes in pampean agroecosystems
title_fullStr A regional audit of nitrogen fluxes in pampean agroecosystems
title_full_unstemmed A regional audit of nitrogen fluxes in pampean agroecosystems
title_sort A regional audit of nitrogen fluxes in pampean agroecosystems
dc.creator.none.fl_str_mv Alvarez, Roberto
Steinbach, Haydée
de Paepe, Josefina
author Alvarez, Roberto
author_facet Alvarez, Roberto
Steinbach, Haydée
de Paepe, Josefina
author_role author
author2 Steinbach, Haydée
de Paepe, Josefina
author2_role author
author
dc.subject.none.fl_str_mv Balance de Nitrógeno
Fijación de Nitrógeno
Productividad Parcial
Región Pampeana
https://purl.org/becyt/ford/4.1
https://purl.org/becyt/ford/4
topic Balance de Nitrógeno
Fijación de Nitrógeno
Productividad Parcial
Región Pampeana
https://purl.org/becyt/ford/4.1
https://purl.org/becyt/ford/4
description Calculations of nitrogen (N) budgets can help in the understanding of agroecosystem functioning and in proposing more sustainable management strategies. Changes in the main N fluxes of the pampean agroecosystems of Argentina were calculated over time. The impact of management changes on regional N budget and possible future trends were estimated. Changes in land use were quantified using national censuses data. Biological N fixation of leguminous forages was assessed using a regression model and local field experimental data. Nitrogen fixation by soybean, the most extensive grain crop, was calculated using an existing model. Fertilizer input was based upon farmer surveys, and atmospheric N input estimated using local data. Nitrogen output by grain harvest was estimated using national yield statistics and averaged grain N concentration derived from many field experiments widespread over the region. During the last 50 years cropped area has doubled as a result of the widespread adoption of soybean as the main component of rotations. The agricultural expansion included areas previously used for grazing on seeded pastures and seasonal graminaceus forages. The historical N budget of the entire region was positive but has dropped from 2.0 Mt y−1 in 1960 to 1.3 Mt y−1 at present. This reduction implies that N fixation by soybean and fertilizer application were lower than the previous livestock/pasture systems N input. During the cropping phase of rotations the N budget was usually negative in the past. Currently, in low yielding areas of semiarid environments, the N budget turned positive; meanwhile in humid climates with high productivity scenarios it remained negative. Fertilizer rates applied balanced N output in the former case but not in the latter. Partial factor productivity of N inputs increased from 3- to 6-fold during the last 50 years in the Pampas. Uncertainties related to the estimations performed are discussed.
publishDate 2014
dc.date.none.fl_str_mv 2014-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/15706
Alvarez, Roberto; Steinbach, Haydée; de Paepe, Josefina; A regional audit of nitrogen fluxes in pampean agroecosystems; Elsevier; Agriculture, Ecosystems And Environment; 184; 1-2014; 1-8
0167-8809
url http://hdl.handle.net/11336/15706
identifier_str_mv Alvarez, Roberto; Steinbach, Haydée; de Paepe, Josefina; A regional audit of nitrogen fluxes in pampean agroecosystems; Elsevier; Agriculture, Ecosystems And Environment; 184; 1-2014; 1-8
0167-8809
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0167880913003873
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.agee.2013.11.003
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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