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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: |
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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.
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Registros recuperados : 25 | |
6. | | SOUSA, T. P. de; CHAIBUB, A. A.; SILVA, G. B. da; LANNA, A. C.; FILIPPI, M. C. C. de. Resposta fisiológica de plantas de arroz de terras altas induzidas por Trichoderma asperellum durante supressão de brusone foliar. In: SEMINÁRIO JOVENS TALENTOS, 11., 2017, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2017. p. 107. (Embrapa Arroz e Feijão. Documentos, 316).Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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7. | | ARRUDA, R. L.; GARCIA, M. L.; SOUSA, T. P. DE; FILIPPI, M. C. C. de; CORTES, M. V. de C. B.; CONCEIÇÃO, E. C. da. Avaliação da atividade antifúngica do extrato de Ruta graveolens L. na inibição do crescimento micelial de Magnaporthe oryzae. In: SEMINÁRIO JOVENS TALENTOS, 9., 2015, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2015. p. 98. (Embrapa Arroz e Feijão. Documentos, 309).Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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8. | | SOUSA, T. P. de; ANJOS, A. R. dos; ROCHA, M. do C.; MORAIS, H. E. L. de; ALBUQUERQUE, A. R.; RAIMAM, M. P. Atividade microbiana como indicador de resposta ambiental em área de deposição de resíduo siderúrgico. Pesquisa Florestal Brasileira, Colombo, v. 42, e202002089, 2022. 11 p.Biblioteca(s): Embrapa Florestas. |
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9. | | SOUSA, T. P. de; SOUZA, A. C. A. de; FILIPPI, M. C. C. de; LANNA, A. C.; CORTES, M. V.; PINHEIRO, H. A.; SILVA, G. B. da. Bioagents and silicon promoting fast early upland rice growth. Environmental Science and Pollution Research, Berlin, v. 25, n. 4, p. 3657-3668, Feb. 2018.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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10. | | SOUSA, T. P. de; SOUZA, A. C. A. de; ARRUDA, R. L.; FILIPPI, M. C. C. de; SILVA, G. B. da. Resposta hormonal de plantas de arroz induzidas por PGPR e Trichoderma asperellum e submetidas à adubação silicatada. In: SEMINÁRIO JOVENS TALENTOS, 9., 2015, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2015. p. 118. (Embrapa Arroz e Feijão. Documentos, 309).Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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12. | | SOUZA, A. C. A de; CORTES, M. V. de B.; SILVA, G. B. da; SOUSA, T. P. de; RODRIGUES, F. A.; FILIPPI, M. C. C. Enzyme-induced defense response in the suppression of rice leaf blast (Magnaporthe Oryzae) by silicon fertilization and bioagents. International Journal of Research Studies in Biosciences, v. 3, n. 5, p. 22-32, May 2015.Tipo: Artigo em Periódico Indexado | Circulação/Nível: C - 0 |
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13. | | SOUSA, T. P de; MARQUES, D. K. S.; VITORINO, C de A.; FARIA, K. de C.; BRAGA, G. da S. F.; FERREIRA, D. C.; VENERE, P. C. Cytogenetic and molecular data support the occurrence of three Gymnotus Species (Gymnotiformes: Gymnotidae) used as live bait in Corumba, Brazil: implications for conservation and management of professional fishing. Zebrafish, v. 14, n. 2, p. 177-186, 2017.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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14. | | NASCENTE, A. S.; LANNA, A. C.; SOUSA, T. P. de; CHAIBUB, A. A.; SOUZA, A. C. A. de; FILIPPI, M. C. C. de. N Fertilizer dose-dependent efficiency of Serratia spp. for improving growth and yield of upland rice (Oryza sativa L.). International Journal of Plant Production, v. 13, n. 3, p. 217-226, Sept. 2019.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
Biblioteca(s): Embrapa Arroz e Feijão. |
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15. | | NASCENTE, A. S.; FILIPPI, M. C. C. de; SOUSA, T. P. de; CHAIBUB, A. A.; SOUZA, A. C. A. de; LANNA, A. C. Rhizobacterium Serratia sp. and phosphorus fertilization rates affect aerobic rice development. Australian Journal of Crop Science, v. 14, n. 10, p. 1654-1661, 2020.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
Biblioteca(s): Embrapa Arroz e Feijão. |
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16. | | ARRUDA, R. L.; SOUSA, T. P. de; FILIPPI, M. C. C. de; CORTES, M. V. de C. B.; CONCEIÇÃO, E. C. da. Utilização de extrato vegetal de Ruta graveolens L. no controle de Magnaporthe oryzae. In: SEMINÁRIO JOVENS TALENTOS, 10., 2016, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2016. p. 74. (Embrapa Arroz e Feijão. Documentos, 311).Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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17. | | PEIXOTO, L. F.; SOUZA, A. C. A. de; MARTINS, B. E. de M.; ALMEIDA, C. M. B. de; SOUSA, T. P. de; PRABHU, A. S.; SILVA, G. B. da; FILIPPI, M. C. C. de. Interação entre silício e bioindutores via foliar na supressão de brusone em plantio direto de arroz em rotação com soja. In: SEMINÁRIO JOVENS TALENTOS, 7., 2013, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2013. p. 78. (Embrapa Arroz e Feijão. Documentos, 292). Pôster - pós-graduação.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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18. | | NASCENTE, A. S.; FILIPPI, M. C. C. de; LANNA, A. C.; SOUSA, T. P. de; SOUZA, A. C. A. de; LOBO, V. L. da S.; SILVA, G. B. da. Effects of beneficial microorganisms on lowland rice development. Environmental Science and Pollution Research, v. 24, n. 32, p. 25233-25242, Nov. 2017.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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19. | | SOUZA, A. C. A. de; FILIPPI, M. C. C. de; SILVA, G. B. da; MARTINS, B. de M.; SOUSA, T. P. de; CORTES, M. V. de B.; PRABHU, A. S. Effeciency da adubação com silício e rizobactérias na supressão de arroz da brusone em condições de sequeiro. In: INTERNATIONAL PLANT PROTECTION CONGRESS, 18., 2015, Berlin. Abstracts. Berlin: IPPC, 2015. p. 546.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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Registros recuperados : 25 | |
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