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dc.contributor.author
Alvarez, Roberto
dc.contributor.author
de Paepe, Josefina
dc.date.available
2021-12-02T15:36:28Z
dc.date.issued
2019-02
dc.identifier.citation
Alvarez, Roberto; de Paepe, Josefina; Modelling the effects of stover harvest on soil organic carbon in the Pampas of Argentina; Csiro Publishing; Soil Research; 57; 3; 2-2019; 257-265
dc.identifier.issn
1838-675X
dc.identifier.uri
http://hdl.handle.net/11336/147966
dc.description.abstract
Our objective was to estimate the impact of harvesting stover from agricultural crops to generate biofuels or electricity on the soil organic carbon levels of the Pampean Region in Argentina. For this purpose, a carbon balance methodology based on artificial neural networks was used. Contrasting soil carbon scenarios for different subregions were constructed using a current map of organic carbon and statistical data for crop rotations. Average yields were also estimated using this information. The neural network methodology allowed calculating the annual carbon balance as the difference between estimating the contribution of carbon in crop residues (stover + roots) to the soil and losses as heterotrophic respiration. The model was run for each level of residue input until the soil carbon attained a steady-state. Current rotations were modelled, with predominance of soybean (Glycine max (L.) Merr.) and alternatives that included a greater proportion of wheat (Triticum aestivum L.) and corn (Zea mays L.). Only the stover of these latter two crops was considered to be partially harvested (30% and 60%). The input of carbon to soil was highly dependent on rotation, increasing as the proportion of wheat and corn in the rotation and the level of yield increased. In contrast, stover harvest had little impact on the carbon input due to the low proportion of both crops in the predominant current rotation. By increasing the proportion of cereal crops or the technological level and yield, it was possible to compensate for the effect of stover harvest on soil carbon. The carbon input from residue needed to maintain soil carbon ranged within 2.0-6.0 t C ha -1 year -1 depending on the initial soil carbon level. Retention efficiency of residue carbon was ∼30% across different management scenarios. It is not recommended to harvest more than 30% of the stover in order to maintain the level of carbon in the soil organic matter of many Pampean soils.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Csiro Publishing
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CARBON SEQUESTRATION
dc.subject
SOIL DEGRADATION
dc.subject
STUBBLE MANAGEMENT
dc.subject.classification
Ciencias del Suelo
dc.subject.classification
Agricultura, Silvicultura y Pesca
dc.subject.classification
CIENCIAS AGRÍCOLAS
dc.title
Modelling the effects of stover harvest on soil organic carbon in the Pampas of Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-11-09T18:57:13Z
dc.journal.volume
57
dc.journal.number
3
dc.journal.pagination
257-265
dc.journal.pais
Australia
dc.journal.ciudad
Collingwood
dc.description.fil
Fil: Alvarez, Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
dc.description.fil
Fil: de Paepe, Josefina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Agronomía; Argentina
dc.journal.title
Soil Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.publish.csiro.au/sr/sr18262
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1071/SR18262
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