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dc.contributor.author
Alvarez, Roberto
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dc.contributor.author
Steinbach, Haydée S.
dc.date.available
2017-05-02T20:56:37Z
dc.date.issued
2011-05
dc.identifier.citation
Alvarez, Roberto; Steinbach, Haydée S.; Modeling Apparent Nitrogen Mineralization under Field Conditions Using Regressions and Artificial Neural Networks; Amer Soc Agronomy; Agronomy Journal; 103; 4; 5-2011; 1159-1168
dc.identifier.issn
0002-1962
dc.identifier.uri
http://hdl.handle.net/11336/15904
dc.description.abstract
Soil N mineralization is an important source of N for grain crops, but its estimation under field conditions is usually very difficult. Our objective was to develop models suitable for predicting N mineralization during the growing seasons of wheat (Triticum aestivum L.) and corn (Zea mays L.) under field conditions. Fifty-eight field experiments were performed with wheat, and 35 with corn, along three growing seasons, in which soil apparent N mineralization was estimated by the mass balance approach. Apparent nitrogen mineralized from decomposing residues (ANMR) or soil humic substances (ANMH) were estimated separately. Two empirical modeling techniques were tested, linear regression and artificial neural networks, using as independent variables or inputs some environmental variables. Both techniques allowed the development of suitable models for N mineralization prediction (R2 > 0.68), but neural networks gave slightly better results. The ANMR ranged from −42 to 64 kg N ha−1, increasing as residue mass and N concentration increased. An average ANMR of 15 to 16 kg N ha−1 was produced both during wheat and corn growing seasons. The ANMH ranged from −80 to 328 kg N ha−1, being on average four times greater during corn growing cycle than during wheat season (127 vs. 34 kg N ha−1). The ANMH decreased as initial mineral N content of the soil, remaining residue mass or fine particles content of the soil increased, and it was greater in soils of higher organic matter level and mineralization potential, as determined by an incubation test. Increases in temperature and rainfall also determine greater ANMH. The methodology developed for apparent N mineralization estimation may be applied to other crops and production regions.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Amer Soc Agronomy
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Mineralization
dc.subject
Nitrogen
dc.subject
Residue
dc.subject
Neural Networks
dc.subject.classification
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Modeling Apparent Nitrogen Mineralization under Field Conditions Using Regressions and Artificial Neural Networks
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-04-24T20:43:39Z
dc.journal.volume
103
dc.journal.number
4
dc.journal.pagination
1159-1168
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Alvarez, Roberto. Universidad de Buenos Aires. Facultad de Agronomia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Steinbach, Haydée S.. Universidad de Buenos Aires. Facultad de Agronomia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Agronomy Journal
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://dl.sciencesocieties.org/publications/aj/abstracts/103/4/1159
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