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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
14/09/2007 |
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Data da última atualização: |
01/03/2013 |
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Autoria: |
MALTAS, A. |
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Título: |
Analyse par experimentation et modelisation de la dynamique de l'azote dans les systemes sous semis direct avec couverture vegetale des cerrados bresiliens. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
2007. |
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Idioma: |
Francês |
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Notas: |
Tese (Doutorado) - Ecole Nationale Superieure Agronomique de Montpellier, Montpellier. |
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Conteúdo: |
ABSTRACT: In the Brazilian Direct seeding Mulch-based Cropping (DMC) is based on the absence of tillage practices, the presence of a mulch of crop residues and the implementation of a cover crop following the main crop. The objective of this study was to assess the impact of DMC systems on soil nitrogen (N) dynamics. The work combined data collection from field and laboratory experiments with simulation modelling using the STICS model. Experiments were conduced on fields planted with maize as the main crop. The treatments applied were the age under DMC, the type of cover crop and the level of N fertilization. Firstly, we analyzed using a chronosequence the long-term impacts of DMC on soil organic matter accumulation and N mineralization. Secondly, we examined a range of cover crop species on their ability to capture N and supply it for a subsequent maize crop. Thirdly, the STICS model was calibrated for the DMC systems in which crop residues are left on the soil surface and soils are not tilled. The ability of the STICS model to predict soil N dynamics and maize yields under these systems was analysed. Finally, the combined effects of age DMC, type of cover crop, and level of N fertilization on the N balance and maize productivity were studied using experimental data and simulation modelling using the STICS model. This work shows that soil total N content increases with the number of years under DMC, which results in an increase in soil N mineralization. The use of cover crops reduces the N leaching potential between two main crops due to plant N uptake. However, the N taken up by cover crops was poorly released via mineralization during the succeeding growing cycle. Positives effects of cover crops on soil N supply occur principally via the long-term increase in soil total N content. The response of maize inorganic N fertilization was not systematic over all treatments and years. It depends greatly on the seasonal rainfall pattern that governs N leaching. Finally, the age of the DMC systems under this study. MenosABSTRACT: In the Brazilian Direct seeding Mulch-based Cropping (DMC) is based on the absence of tillage practices, the presence of a mulch of crop residues and the implementation of a cover crop following the main crop. The objective of this study was to assess the impact of DMC systems on soil nitrogen (N) dynamics. The work combined data collection from field and laboratory experiments with simulation modelling using the STICS model. Experiments were conduced on fields planted with maize as the main crop. The treatments applied were the age under DMC, the type of cover crop and the level of N fertilization. Firstly, we analyzed using a chronosequence the long-term impacts of DMC on soil organic matter accumulation and N mineralization. Secondly, we examined a range of cover crop species on their ability to capture N and supply it for a subsequent maize crop. Thirdly, the STICS model was calibrated for the DMC systems in which crop residues are left on the soil surface and soils are not tilled. The ability of the STICS model to predict soil N dynamics and maize yields under these systems was analysed. Finally, the combined effects of age DMC, type of cover crop, and level of N fertilization on the N balance and maize productivity were studied using experimental data and simulation modelling using the STICS model. This work shows that soil total N content increases with the number of years under DMC, which results in an increase in soil N mineralization. The use of cover cro... Mostrar Tudo |
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Palavras-Chave: |
Dinamcs; Dinâmica; Fertilização; Modelagem; Preparo do solo; Zero tillage. |
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Thesagro: |
Cerrado; Nitrogênio; Plantio Direto; Solo. |
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Thesaurus Nal: |
fertilizer application; models; nitrogen; soil treatment. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02904nam a2200289 a 4500
001 1560405
005 2013-03-01
008 2007 bl uuuu m 00u1 u #d
100 1 $aMALTAS, A.
245 $aAnalyse par experimentation et modelisation de la dynamique de l'azote dans les systemes sous semis direct avec couverture vegetale des cerrados bresiliens.
260 $a2007.$c2007
500 $aTese (Doutorado) - Ecole Nationale Superieure Agronomique de Montpellier, Montpellier.
520 $aABSTRACT: In the Brazilian Direct seeding Mulch-based Cropping (DMC) is based on the absence of tillage practices, the presence of a mulch of crop residues and the implementation of a cover crop following the main crop. The objective of this study was to assess the impact of DMC systems on soil nitrogen (N) dynamics. The work combined data collection from field and laboratory experiments with simulation modelling using the STICS model. Experiments were conduced on fields planted with maize as the main crop. The treatments applied were the age under DMC, the type of cover crop and the level of N fertilization. Firstly, we analyzed using a chronosequence the long-term impacts of DMC on soil organic matter accumulation and N mineralization. Secondly, we examined a range of cover crop species on their ability to capture N and supply it for a subsequent maize crop. Thirdly, the STICS model was calibrated for the DMC systems in which crop residues are left on the soil surface and soils are not tilled. The ability of the STICS model to predict soil N dynamics and maize yields under these systems was analysed. Finally, the combined effects of age DMC, type of cover crop, and level of N fertilization on the N balance and maize productivity were studied using experimental data and simulation modelling using the STICS model. This work shows that soil total N content increases with the number of years under DMC, which results in an increase in soil N mineralization. The use of cover crops reduces the N leaching potential between two main crops due to plant N uptake. However, the N taken up by cover crops was poorly released via mineralization during the succeeding growing cycle. Positives effects of cover crops on soil N supply occur principally via the long-term increase in soil total N content. The response of maize inorganic N fertilization was not systematic over all treatments and years. It depends greatly on the seasonal rainfall pattern that governs N leaching. Finally, the age of the DMC systems under this study.
650 $afertilizer application
650 $amodels
650 $anitrogen
650 $asoil treatment
650 $aCerrado
650 $aNitrogênio
650 $aPlantio Direto
650 $aSolo
653 $aDinamcs
653 $aDinâmica
653 $aFertilização
653 $aModelagem
653 $aPreparo do solo
653 $aZero tillage
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 4 | |
| 1. |  | MALTAS, A.; CORBEELS, M.; SCOPEL, E.; WERY, J.; SILVA, F. A. M. da. Cover crop and nitrogen effects on maize productivity in no-tillage systems of the Brazilian Cerrados. Agronomy Journal, Madison, v. 101, n. 5, p. 1036-1046, 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Cerrados. |
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| 2. | | MALTAS, A.; CORBEELS, M.; SCOPEL, E.; OLIVER, R.; DOUZET, J.-M.; SILVA, F. A. M. da; WERY, J. Long-term effects of continuous direct seeding mulch-based cropping systems on soil nitrogen supply in the Cerrado region on Brazil. Plant and Soil, v. 298, n. 1/2, p. 161-173, 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Cerrados. |
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| 3. | | SILVA, F. A. M. da; CARDOSO, A. N.; SCOPEL, E.; DOUZET, J. M.; METAY, A.; REYES GOMEZ, V.; ALVES MOREIRA, J. A.; CORBELLS, M.; FINDELING, A.; BERNOUX, M.; SIQUEIRA NETO, M.; MALTAS, A.; RECOUS, S. Caracterização e modelagem do funcionamento dos sistemas de cultivo em plantio direto com cobertura vegetal (SPDCV). In: ANDRADE, S. R. M. de; FALEIRO, F. G.; SERENO, J. R.; DALLA CORTE, J. L.; SOUSA, E. dos S. de (Ed.). Resultados de pesquisa para o Cerrado: 2004-2005. Planaltina, DF: Embrapa Cerrados, 2007. p. 89-96.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Cerrados. |
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| 4. | | SILVA, F. A. M. da; CARDOSO, A. N.; SCOPEL, E.; DOUZET, J. M.; METAY, A.; REYES-GOMÉZ, V. M.; MOREIRA, J. A. A.; CORBELLS, M.; FINDELING, A.; BERNOUX, M. M. Y.; SIQUEIRA NETO, M.; MALTAS, A.; RECOUS, S. Caracterização e modelagem do funcionamento dos sistemas de cultivo em plantio direto com cobertura vegetal (SPDCV). In: ANDRADE, S. R. M. de; FALEIRO, F. G.; SERENO, J. R.; DALLA CORTE, J. L.; SOUSA, E. dos S. de (Ed.). Resultados de pesquisa para o Cerrado: 2004-2005. Planaltina, DF: Embrapa Cerrados, 2007. p. 89-96.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| Registros recuperados : 4 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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