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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
06/02/2018 |
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Data da última atualização: |
30/10/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GOMES, E. T. M.; BERBARA, R. L. L.; PEREIRA, M. G.; URQUIAGA, S.; TAVARES, O. C. H.; ASSUNÇÃO, S. A.; ZONTA, E.; AMARAL SOBRINHO, N. M. do; GARCPUAM A, C. |
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Afiliação: |
ERNANE TARCÍSIO MARTINS GOMES, UFRRJ; RICARDO LUIS LOURO BERBARA, UFRRJ; MARCOS GERVASIO PEREIRA, UFRRJ; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; ORLANDO CARLOS HUERTAS TAVARES, UFRRJ; SHIRLEI ALMEIDA ASSUNÇÃO, UFRRJ; EVERALDO ZONTA, UFRRJ; NELSON MOURA BRASIL DO AMARAL SOBRINHO, UFRRJ; ANDRÉS CALDERÍN GARCÍA, UFRRJ. |
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Título: |
Effects of farmed managements in sandy soils on composition and stabilization of soil humic substances. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Land Degradation & Development, v. 29, n. 1, p. 68-79, 2018. |
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DOI: |
10.1002/ldr.2839 |
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Idioma: |
Inglês |
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Conteúdo: |
Sandy soils in tropical climates with low organic matter (OM) content result in degradation and fertility loss. It is important to note that humified OM accumulation and stabilization increases soil fertility. This study aimed to characterize humic acids (HAs) in sandy soils on an agroecological farm operating for more than 20years. The structures of the HA of two Planosols under a grazing (G) and crop rotation (R) management system and of an Acrisol under an agroforestry management system (AFS) were characterized using HA extracted from a local Organosol under cassava monoculture (M) as a structural reference. Lower C-HA/C-FA ratio in sandy soil reveals a slightly humified OM and higher E-4/E-6 ratio value in HA confirming lower aromatic structure condensation. The HA in Planosols (R and G) and Acrisols (AFS) are predominantly formed by C-Alq-O,C-N-, CAlq-O-, and CAlq-di-O structures closely related to the soil physical properties and preserved by interaction with the mineral fraction confirmed by O-H, Si-O stretching of kaolinite and hematite bands in FTIR spectroscopy. Management and vegetal carbon type (-20.65 parts per thousand AFS -C-3) or (-15.55 parts per thousand (G) and -17.82 parts per thousand (R) -C-4) had no effect on HA formation. Evolution of structural change in HA modeled by chemometric analyses showed that more recalcitrant structure characteristic in HA can enhance OM preservation in these sandy soils. This study elucidated the OM stabilization mechanisms of sandy soil HA, their relationship with soil properties and models structural changes for humified OM recovery and preservation, which contribute to increased fertility and agricultural production. MenosSandy soils in tropical climates with low organic matter (OM) content result in degradation and fertility loss. It is important to note that humified OM accumulation and stabilization increases soil fertility. This study aimed to characterize humic acids (HAs) in sandy soils on an agroecological farm operating for more than 20years. The structures of the HA of two Planosols under a grazing (G) and crop rotation (R) management system and of an Acrisol under an agroforestry management system (AFS) were characterized using HA extracted from a local Organosol under cassava monoculture (M) as a structural reference. Lower C-HA/C-FA ratio in sandy soil reveals a slightly humified OM and higher E-4/E-6 ratio value in HA confirming lower aromatic structure condensation. The HA in Planosols (R and G) and Acrisols (AFS) are predominantly formed by C-Alq-O,C-N-, CAlq-O-, and CAlq-di-O structures closely related to the soil physical properties and preserved by interaction with the mineral fraction confirmed by O-H, Si-O stretching of kaolinite and hematite bands in FTIR spectroscopy. Management and vegetal carbon type (-20.65 parts per thousand AFS -C-3) or (-15.55 parts per thousand (G) and -17.82 parts per thousand (R) -C-4) had no effect on HA formation. Evolution of structural change in HA modeled by chemometric analyses showed that more recalcitrant structure characteristic in HA can enhance OM preservation in these sandy soils. This study elucidated the OM stabilization mechanisms... Mostrar Tudo |
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Palavras-Chave: |
Organic agriculture; Sandy soil; Soil preservation. |
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Thesaurus Nal: |
humic acids; soil organic matter. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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| 2. |  | CAMPANHOLA, C.; GABRIEL. D.; MARTIN, D. F.; CALCAGNOLO, G. Levantamento de adultos do bicudo Anthonomus grandis (Boh., 1843) (Coleoptera, Curculionidae) utilizando armadilhas com feromônio, em alguns municípios do Estado de São Paulo. Anais da Sociedade Entomologica do Brasil, v. 17, n. 1, p. 135-156, 1988.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 3. | | GABRIEL, D.; BLANCO, F. M. G.; COSTA, V. A.; FIORINE, F. A.; ROBERG, B. R. Parasitismo sobre Aphis Gossypii Glover (HEMIPTERA: APHIDIDAE), em algodoeiro In: CONGRESSO BRASILEIRO DO ALGODÃO, 6., 2007, Uberlândia. Resumos... Uberlândia, 2007. p. 1-5 1 CD-ROM| Biblioteca(s): Embrapa Algodão. |
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| 4. | | AZEVEDO, F. A. de; MOURÃO FILHO, F. de A. A.; SCHINOR, E. H.; PAOLI, L. G. de; MENDES, B. M. J.; HARAKAVA, R.; GABRIEL, D. W.; LEE, R. F. GUS gene expression driven by a citrus promoter in transgenic tobacco and 'Valencia' sweet orange. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 41, n. 11, p. 1623-1628, nov. 2006 Título em português: Expressão do gene GUS controlado por promotor de citros em plantas transgênicas de tabaco e laranja 'Valência'.| Biblioteca(s): Embrapa Unidades Centrais. |
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