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Registro Completo |
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
15/04/2004 |
Data da última atualização: |
25/10/2020 |
Autoria: |
MACHADO, P. L. O. de A.; SOHI, S. P.; GAUNT, J. L. |
Afiliação: |
PEDRO LUIZ OLIVEIRA DE A MACHADO, CNPS. |
Título: |
Effect of no-tillage on turnover of organic matter in a Rhodic Ferralsol. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Soil Use and Management, v. 19, n. 3, p. 250-256, Sept. 2003. |
DOI: |
https://doi.org/10.1111/j.1475-2743.2003.tb00311.x |
Idioma: |
Inglês |
Conteúdo: |
Soil organic matter (SOM) is considered to be key to sustainability of agriculture in the tropics. In southern Brazil, no-tillage has been adopted widely to control soil erosion, but its impact on the dynamics of SOM is not well established. We measured soil carbon (C) and d13C in two crop rotations, one of which contained C4 maize (Zea mays L.), after 21 years of contrasting tillage (conventional tillage versus no-tillage). Adjacent sites that reflected historic land-uses were also sampled. In the tillage experiment there was no effect of tillage on the total amount of C in the 0-40 cm profile (even when contrasting bulk density was accounted for), and the concentration of C differed only in the 0-5 cm and 5-10 cm layers. However, the occasional input of C4 material in the maize rotation resulted in a significant effect of rotation on d13C (P <0.001). Using 13C as a tracer for the SOM formed since the start of the experiment, we estimated the abundance of 'recent' and 'old' C within each depth interval. We found the main effect of tillage was to increase the medium-term turnover of SOM, particularly in the subsoil (i.e. below 20 cm depth). Compared with no-tillage, there was almost five times more recent C in the subsoil, and 20% more recent C in the 0?40 cm profile as a whole. |
Thesagro: |
Ferralsolo; Matéria Orgânica; Plantio Direto. |
Thesaurus Nal: |
Ferralsols; No-tillage; Soil organic matter. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02004naa a2200229 a 4500 001 1335978 005 2020-10-25 008 2003 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1111/j.1475-2743.2003.tb00311.x$2DOI 100 1 $aMACHADO, P. L. O. de A. 245 $aEffect of no-tillage on turnover of organic matter in a Rhodic Ferralsol.$h[electronic resource] 260 $c2003 520 $aSoil organic matter (SOM) is considered to be key to sustainability of agriculture in the tropics. In southern Brazil, no-tillage has been adopted widely to control soil erosion, but its impact on the dynamics of SOM is not well established. We measured soil carbon (C) and d13C in two crop rotations, one of which contained C4 maize (Zea mays L.), after 21 years of contrasting tillage (conventional tillage versus no-tillage). Adjacent sites that reflected historic land-uses were also sampled. In the tillage experiment there was no effect of tillage on the total amount of C in the 0-40 cm profile (even when contrasting bulk density was accounted for), and the concentration of C differed only in the 0-5 cm and 5-10 cm layers. However, the occasional input of C4 material in the maize rotation resulted in a significant effect of rotation on d13C (P <0.001). Using 13C as a tracer for the SOM formed since the start of the experiment, we estimated the abundance of 'recent' and 'old' C within each depth interval. We found the main effect of tillage was to increase the medium-term turnover of SOM, particularly in the subsoil (i.e. below 20 cm depth). Compared with no-tillage, there was almost five times more recent C in the subsoil, and 20% more recent C in the 0?40 cm profile as a whole. 650 $aFerralsols 650 $aNo-tillage 650 $aSoil organic matter 650 $aFerralsolo 650 $aMatéria Orgânica 650 $aPlantio Direto 700 1 $aSOHI, S. P. 700 1 $aGAUNT, J. L. 773 $tSoil Use and Management$gv. 19, n. 3, p. 250-256, Sept. 2003.
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Embrapa Solos (CNPS) |
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Registro Completo
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
25/04/2008 |
Data da última atualização: |
03/01/2013 |
Tipo da produção científica: |
Comunicado Técnico/Recomendações Técnicas |
Autoria: |
LOPES, A. de M. |
Afiliação: |
Altevir de Matos Lopes, CPATU. |
Título: |
BRS Jaçanã: cultivar de arroz para áreas de várzea do Estado do Pará. |
Ano de publicação: |
2007 |
Fonte/Imprenta: |
Belém, PA: Embrapa Amazônia Oriental, 2007. |
Páginas: |
4 p. |
Descrição Física: |
il. |
Série: |
(Embrapa Amazônia Oriental. Comunicado técnico, 197). |
Idioma: |
Português |
Palavras-Chave: |
Brasil; Pará. |
Thesagro: |
Arroz; Melhoramento Genético Vegetal; Variedade; Várzea. |
Thesaurus NAL: |
Amazonia. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/27800/1/Com.tec.197.pdf
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Marc: |
LEADER 00593nam a2200205 a 4500 001 1409620 005 2013-01-03 008 2007 bl uuuu u0uu1 u #d 100 1 $aLOPES, A. de M. 245 $aBRS Jaçanã$bcultivar de arroz para áreas de várzea do Estado do Pará. 260 $aBelém, PA: Embrapa Amazônia Oriental$c2007 300 $a4 p.$cil. 490 $a(Embrapa Amazônia Oriental. Comunicado técnico, 197). 650 $aAmazonia 650 $aArroz 650 $aMelhoramento Genético Vegetal 650 $aVariedade 650 $aVárzea 653 $aBrasil 653 $aPará
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