| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Clima Temperado. |
|
Data corrente: |
25/03/2008 |
|
Data da última atualização: |
13/08/2008 |
|
Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
|
Autoria: |
FAGUNDES, P. R. R.; MAGALHÃES JÚNIOR, A. M.; PETRINI, J. A.; ANDRES, A.; FRANCO, D, F, NUNES, C, D.; SEVERO, A.; VIEGAS, A. D. |
|
Título: |
Avaliação de cultivares recomendadas de arroz irrigado da Embrapa, no Rio Grande do Sul. 2006/07. |
|
Ano de publicação: |
2007 |
|
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 5.; REUNIÃO DA CULTURA DO ARROZ IRRIGADO, 27., 2007, Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2007. |
|
Volume: |
v. 1 |
|
Páginas: |
p. 35-37 |
|
Idioma: |
Português |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 00717naa a2200205 a 4500
001 1745454
005 2008-08-13
008 2007 bl uuuu u00u1 u #d
100 1 $aFAGUNDES, P. R. R.
245 $aAvaliação de cultivares recomendadas de arroz irrigado da Embrapa, no Rio Grande do Sul. 2006/07.
260 $c2007
300 $ap. 35-37 v. 1
490 $vv. 1
700 1 $aMAGALHÃES JÚNIOR, A. M.
700 1 $aPETRINI, J. A.
700 1 $aANDRES, A.
700 1 $aFRANCO, D, F, NUNES, C, D.
700 1 $aSEVERO, A.
700 1 $aVIEGAS, A. D.
773 $tIn: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 5.; REUNIÃO DA CULTURA DO ARROZ IRRIGADO, 27., 2007, Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2007.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Clima Temperado (CPACT) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Cerrados. |
|
Data corrente: |
16/02/2000 |
|
Data da última atualização: |
16/02/2000 |
|
Autoria: |
NEUFELDT, H.; AYARZA, M. A.; RESCK, D. V. S.; ZECH, W. |
|
Título: |
Distribution of water-stable aggregates and aggregating agents in Cerrado Oxisols. |
|
Ano de publicação: |
1999 |
|
Fonte/Imprenta: |
Geoderma, Amsterdam, v.93, p.85-99, 1999. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The effects of structural changes on Cerrado Oxisols in Brazil after land-use change are still insufficiently studied. Therefore, topsoil samples of loamy and clayey Cerrado Oxisols under crop pasture and reforestation were fractionated using a wet-sieving procedure to obtain the distribution of water-stable aggregates and compared to samples from natural savanna. The results were correlated to organic and inorganic soil compounds to identify the main aggregating agents and discussed in relation to changes in the pore-size distribution of the soils. Clayey soils showed a significantly higher macro-aggregation than loamy soils. Compared to natural savanna, macro-aggregation was clearly reduced at the crop sites, whereas aggregation of soils under pasture and reforestation was only slightly affected. In both the clayey and the loamy soils, bonding of polysaccharides was the main aggregating agent. In the clayey soils, liming was also very important for disaggregation by weakening the electrostatic forces between positively and negativeley charged soil compounds, whereas in the loamy soils, binding of macro-aggregates by roots was significant. The introduction of crop-pasture rotations was therefore proposed to take advantage of the strong rooting and polysaccharide production of pastures. Management-induced disaggregation strongly affected the pore-size distribution by compacting the soils. Thereby, macro-porosity was reduced and the ampunt of meso-pores was increased, while micro-porosity was unaffected from management and only differed between the two substrates. Considering the low pore space at plant-available matrix potentials typical of Cerrado Oxisols, the increase might be important for annual crops during the frequent dry spells in the rainy season. MenosThe effects of structural changes on Cerrado Oxisols in Brazil after land-use change are still insufficiently studied. Therefore, topsoil samples of loamy and clayey Cerrado Oxisols under crop pasture and reforestation were fractionated using a wet-sieving procedure to obtain the distribution of water-stable aggregates and compared to samples from natural savanna. The results were correlated to organic and inorganic soil compounds to identify the main aggregating agents and discussed in relation to changes in the pore-size distribution of the soils. Clayey soils showed a significantly higher macro-aggregation than loamy soils. Compared to natural savanna, macro-aggregation was clearly reduced at the crop sites, whereas aggregation of soils under pasture and reforestation was only slightly affected. In both the clayey and the loamy soils, bonding of polysaccharides was the main aggregating agent. In the clayey soils, liming was also very important for disaggregation by weakening the electrostatic forces between positively and negativeley charged soil compounds, whereas in the loamy soils, binding of macro-aggregates by roots was significant. The introduction of crop-pasture rotations was therefore proposed to take advantage of the strong rooting and polysaccharide production of pastures. Management-induced disaggregation strongly affected the pore-size distribution by compacting the soils. Thereby, macro-porosity was reduced and the ampunt of meso-pores was increased, while m... Mostrar Tudo |
|
Thesagro: |
Cerrado; Estrutura do Solo; Uso da Terra. |
|
Thesaurus NAL: |
Ferralsols; land use; soil structure. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02389naa a2200229 a 4500
001 1555056
005 2000-02-16
008 1999 bl --- 0-- u #d
100 1 $aNEUFELDT, H.
245 $aDistribution of water-stable aggregates and aggregating agents in Cerrado Oxisols.
260 $c1999
520 $aThe effects of structural changes on Cerrado Oxisols in Brazil after land-use change are still insufficiently studied. Therefore, topsoil samples of loamy and clayey Cerrado Oxisols under crop pasture and reforestation were fractionated using a wet-sieving procedure to obtain the distribution of water-stable aggregates and compared to samples from natural savanna. The results were correlated to organic and inorganic soil compounds to identify the main aggregating agents and discussed in relation to changes in the pore-size distribution of the soils. Clayey soils showed a significantly higher macro-aggregation than loamy soils. Compared to natural savanna, macro-aggregation was clearly reduced at the crop sites, whereas aggregation of soils under pasture and reforestation was only slightly affected. In both the clayey and the loamy soils, bonding of polysaccharides was the main aggregating agent. In the clayey soils, liming was also very important for disaggregation by weakening the electrostatic forces between positively and negativeley charged soil compounds, whereas in the loamy soils, binding of macro-aggregates by roots was significant. The introduction of crop-pasture rotations was therefore proposed to take advantage of the strong rooting and polysaccharide production of pastures. Management-induced disaggregation strongly affected the pore-size distribution by compacting the soils. Thereby, macro-porosity was reduced and the ampunt of meso-pores was increased, while micro-porosity was unaffected from management and only differed between the two substrates. Considering the low pore space at plant-available matrix potentials typical of Cerrado Oxisols, the increase might be important for annual crops during the frequent dry spells in the rainy season.
650 $aFerralsols
650 $aland use
650 $asoil structure
650 $aCerrado
650 $aEstrutura do Solo
650 $aUso da Terra
700 1 $aAYARZA, M. A.
700 1 $aRESCK, D. V. S.
700 1 $aZECH, W.
773 $tGeoderma, Amsterdam$gv.93, p.85-99, 1999.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Cerrados (CPAC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
