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| 5. |  | BARBOSA, R. I.; LUZ, F. J. F.; NASCIMENTO FILHO, H. R. do; MADURO, C. B. Pimentas do gênero Capsicum cultivadas em Roraima, Amazônia brasileira: I. Espécies domesticadas. Acta Amazônica, Manaus, v. 32, n. 2, p. 177-132, abr./jun. 2002.| Biblioteca(s): Embrapa Hortaliças. |
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| 6. | | BARBOSA, R. A.; LUZ, F. J. F.; NASCIMENTO FILHO, L. H. R. do; MADURO, C. B. Pimentas do gênero Capsicum cultivadas em Roraima, Amazônia brasileira. I. Espécies domesticadas. Acta Amazônica, Manaus, v.32, n.2, p.177-192, abr./jun.2002.| Biblioteca(s): Embrapa Amapá. |
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| 9. | | BIANCHETTI, L. de B.; BUSO, G. S. C.; CARVALHO, S. I. C. de; BARBOSA, R. I.; LUZ, F. J. F. Qual a importância de identificarmos um ancestral silvestre de uma cultura domesticada? Nós encontramos um! - O caso de Capsicum chinense. In: SIMPÓSIO BRASILEIRO DE RECURSOS GENÉTICOS, 2., 2008, Brasília, DF. Anais... Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia: Fundação de Apoio à Pesquisa Científica e Tecnológica - FUNCREDI, 2008. p.245.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 10. | | ARAUJO, E. C. E.; LUZ, F. J. F.; SOUZA, V. A. B. de; OLIVEIRA, J. M. F. de; OLIVEIRA, J. F. de. Introducao e avaliacao de cultivares de cebola (Allium cepa L.) na Vila Pacaraima, Roraima. Horticultura Brasileira, v. 7, n. 1, p. 41, 1989.| Biblioteca(s): Embrapa Meio-Norte. |
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| 11. | | QUERINO, R. B.; MARSÁRO JUNIOR, A. L.; HALFELD-VIEIRA, B. de A.; SANTOS, C. S. V. dos; LUZ, F. J. F.; ZILLI, J. E.; NECHET, K. de L.; COSTA, M. C. G.; MATTOS, P. S. R. de; MEDEIROS, R. D. de. Diagnóstico de pequenas propiedades de hortifrutigranjeiros em Boa Vista/RR. Boa Vista: EMBRAPA RORAIMA, 2008. (Embrapa Roraima. Documentos, 11).| Biblioteca(s): Embrapa Roraima. |
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Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Soja. |
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Data corrente: |
18/07/2005 |
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Data da última atualização: |
20/10/2005 |
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Autoria: |
ZOTARELLI, L.; ALVES, B. J. R.; URQUIAGA, S.; TORRES, E.; SANTOS, H. P. dos; PAUSTIAN, K.; BODDEY, R. M.; SIX, J. |
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Título: |
Impact of tillage and crop rotation on aggregate-associated carbon in two oxisols. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Soil Science Society of America Journal, Madison, v. 69:n. 2, p. 482-491, Mar./Apr. 2005. |
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Idioma: |
Inglês |
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Conteúdo: |
In temperate regions, the adoption of no-tillage (NT) often stimulates the sequestration of soil C and N and improves soil structural stability. The aim of this study was to investigate if NT has similar impacts on the stability of water-stable aggregates and C and N stabilization in two Oxisols (Typic Haplorthox) under different crop rotations. Slaking-resistant aggregates were isolated by wet sieving and analyzed for C and N concentrations at two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil. At both sites, the total organic C and N in the 0- to 5-cm depth interval, decreased in order native vegetation (NV) > NT > conventional tillage (CT). The mean weight diameter (MWD) of the aggregates was on average 0.5 mm greater under NT compared with CT, and was also greater (approximately 0.2 mm) under more diverse rotations, which included a leguminous green-manure crop, in comparison with continuous wheat (Triticum aestivum)-soybean (Glycine Max L.). The aggregate-size distribution was dominated (60-90%) by macroaggregates (>250- µm). At both sites, CT decreased the proportion of the largest macroaggregate class (>2000 µm) by approximately 10% in comparison with NT management, and there was a corresponding increase in the proportion of the 53- to 250-µm aggregate class. In the 0- to 5-cm soil layer of both sites, the C and N concentrations were significantly higher in the macroaggregates of the NT than of the CT systems. The lack of differences in C, N content, and C/N ratio across aggregate-size classes indicated that these soils dominated by 1:1 clays and Fe/Al oxides do not express an aggregate hierarchy and that an increase in aggregation does not explain the increase in C and N under NT. In conclusion, CT decreased aggregation similarly in Oxisols as in temperate soils, but this decrease does not explain the loss of C and N because the tight feedback between soil organic matter (SOM) and aggregate stability (i.e., SOM being a major binding agent) observed for temperate soils was not found for Oxisols. MenosIn temperate regions, the adoption of no-tillage (NT) often stimulates the sequestration of soil C and N and improves soil structural stability. The aim of this study was to investigate if NT has similar impacts on the stability of water-stable aggregates and C and N stabilization in two Oxisols (Typic Haplorthox) under different crop rotations. Slaking-resistant aggregates were isolated by wet sieving and analyzed for C and N concentrations at two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil. At both sites, the total organic C and N in the 0- to 5-cm depth interval, decreased in order native vegetation (NV) > NT > conventional tillage (CT). The mean weight diameter (MWD) of the aggregates was on average 0.5 mm greater under NT compared with CT, and was also greater (approximately 0.2 mm) under more diverse rotations, which included a leguminous green-manure crop, in comparison with continuous wheat (Triticum aestivum)-soybean (Glycine Max L.). The aggregate-size distribution was dominated (60-90%) by macroaggregates (>250- µm). At both sites, CT decreased the proportion of the largest macroaggregate class (>2000 µm) by approximately 10% in comparison with NT management, and there was a corresponding increase in the proportion of the 53- to 250-µm aggregate class. In the 0- to 5-cm soil layer of both sites, the C and N concentrations were significantly higher in the macroaggregates of the NT than of the CT systems. The lack of differences in C,... Mostrar Tudo |
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Palavras-Chave: |
C; Rotational cropping. |
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Thesagro: |
Carbono; Matéria Orgânica; Nitrogênio; Plantio Direto; Rotação de Cultura; Soja; Solo. |
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Thesaurus NAL: |
carbon; organic matter; soil. |
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Categoria do assunto: |
-- |
|
Marc: |
LEADER 03003naa a2200349 a 4500
001 1468464
005 2005-10-20
008 2005 bl --- 0-- u #d
100 1 $aZOTARELLI, L.
245 $aImpact of tillage and crop rotation on aggregate-associated carbon in two oxisols.
260 $c2005
520 $aIn temperate regions, the adoption of no-tillage (NT) often stimulates the sequestration of soil C and N and improves soil structural stability. The aim of this study was to investigate if NT has similar impacts on the stability of water-stable aggregates and C and N stabilization in two Oxisols (Typic Haplorthox) under different crop rotations. Slaking-resistant aggregates were isolated by wet sieving and analyzed for C and N concentrations at two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil. At both sites, the total organic C and N in the 0- to 5-cm depth interval, decreased in order native vegetation (NV) > NT > conventional tillage (CT). The mean weight diameter (MWD) of the aggregates was on average 0.5 mm greater under NT compared with CT, and was also greater (approximately 0.2 mm) under more diverse rotations, which included a leguminous green-manure crop, in comparison with continuous wheat (Triticum aestivum)-soybean (Glycine Max L.). The aggregate-size distribution was dominated (60-90%) by macroaggregates (>250- µm). At both sites, CT decreased the proportion of the largest macroaggregate class (>2000 µm) by approximately 10% in comparison with NT management, and there was a corresponding increase in the proportion of the 53- to 250-µm aggregate class. In the 0- to 5-cm soil layer of both sites, the C and N concentrations were significantly higher in the macroaggregates of the NT than of the CT systems. The lack of differences in C, N content, and C/N ratio across aggregate-size classes indicated that these soils dominated by 1:1 clays and Fe/Al oxides do not express an aggregate hierarchy and that an increase in aggregation does not explain the increase in C and N under NT. In conclusion, CT decreased aggregation similarly in Oxisols as in temperate soils, but this decrease does not explain the loss of C and N because the tight feedback between soil organic matter (SOM) and aggregate stability (i.e., SOM being a major binding agent) observed for temperate soils was not found for Oxisols.
650 $acarbon
650 $aorganic matter
650 $asoil
650 $aCarbono
650 $aMatéria Orgânica
650 $aNitrogênio
650 $aPlantio Direto
650 $aRotação de Cultura
650 $aSoja
650 $aSolo
653 $aC
653 $aRotational cropping
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aTORRES, E.
700 1 $aSANTOS, H. P. dos
700 1 $aPAUSTIAN, K.
700 1 $aBODDEY, R. M.
700 1 $aSIX, J.
773 $tSoil Science Society of America Journal, Madison$gv. 69:n. 2, p. 482-491, Mar./Apr. 2005.
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