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Registro Completo |
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Biblioteca(s): |
Embrapa Agropecuária Oeste; Embrapa Amapá; Embrapa Meio-Norte; Embrapa Rondônia; Embrapa Tabuleiros Costeiros; Embrapa Unidades Centrais. |
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Data corrente: |
27/03/1998 |
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Data da última atualização: |
20/10/2016 |
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Autoria: |
RANGEL, J. H. de A.; LIMA, J. O. A. de A.; ALMEIDA, S. A. |
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Título: |
Efeito da pressão de pastejo sobre a persistência e produtividade de pastagens cultivadas de Brachiaria brizantha, cv. Marandu, em consorcio com Arachis repens e Gliricidia sepium em tabuleiros costeiros de Sergipe. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Aracaju: Embrapa-CPATC, 1997. |
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Páginas: |
4p. |
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Série: |
(Embrapa-CPATC. Pesquisa em Andamento, 27). |
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Idioma: |
Português |
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Palavras-Chave: |
Arachis repens; Brasil; Coastal tablelands; Consorciacao; Consorcio; Feed crops; Marandu; Pasture; Proditividade; Productivity; Produtuvudade; Sergipe; Tabuleiro costeiro; Tabuleiros Costeiros; Variedade Marandu. |
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Thesagro: |
Brachiaria Brizantha; Capacidade de Suporte; Capim Brachiaria; Pastagem; Pastejo; Planta Forrageira; Produtividade; Rendimento. |
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Thesaurus Nal: |
Brazil; Gliricidia sepium; grazing; intercropping; pastures; yields. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/148976/1/Efeito-da-pressao0001.pdf
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Marc: |
LEADER 01430nam a2200493 a 4500
001 1359343
005 2016-10-20
008 1997 bl uuuu u0uu1 u #d
100 1 $aRANGEL, J. H. de A.
245 $aEfeito da pressão de pastejo sobre a persistência e produtividade de pastagens cultivadas de Brachiaria brizantha, cv. Marandu, em consorcio com Arachis repens e Gliricidia sepium em tabuleiros costeiros de Sergipe.
260 $aAracaju: Embrapa-CPATC$c1997
300 $a4p.
490 $a(Embrapa-CPATC. Pesquisa em Andamento, 27).
650 $aBrazil
650 $aGliricidia sepium
650 $agrazing
650 $aintercropping
650 $apastures
650 $ayields
650 $aBrachiaria Brizantha
650 $aCapacidade de Suporte
650 $aCapim Brachiaria
650 $aPastagem
650 $aPastejo
650 $aPlanta Forrageira
650 $aProdutividade
650 $aRendimento
653 $aArachis repens
653 $aBrasil
653 $aCoastal tablelands
653 $aConsorciacao
653 $aConsorcio
653 $aFeed crops
653 $aMarandu
653 $aPasture
653 $aProditividade
653 $aProductivity
653 $aProdutuvudade
653 $aSergipe
653 $aTabuleiro costeiro
653 $aTabuleiros Costeiros
653 $aVariedade Marandu
700 1 $aLIMA, J. O. A. de A.
700 1 $aALMEIDA, S. A.
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Registro original: |
Embrapa Tabuleiros Costeiros (CPATC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
29/11/2020 |
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Data da última atualização: |
11/02/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SONG, G.; HAYES, M. H. B.; NOVOTNY, E. H. |
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Afiliação: |
GUIXUE SONG, SHANDONG UNIVERSITY; MICHAEL H. B. HAYES, UNIVERSITY OF LIMERICK; ETELVINO HENRIQUE NOVOTNY, CNPS. |
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Título: |
A two-year incubation study of transformations of crop residues into soil organic matter (SOM) and a procedure for the sequential isolation and the fractionation of components of SOM. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Science of the Total Environment, v. 763, 143034, Apr. 2021. |
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DOI: |
https://doi.org/10.1016/j.scitotenv.2020.143034 |
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Idioma: |
Inglês |
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Conteúdo: |
Maize (Zea mays) stover, with its natural C-13 abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of C-13 in the maize amendment allowed the contributions of the stover to be traced in the components of soil organic matter (SOM) isolated and fractionated using a sequential exhaustive extraction (SEE) process that gave 16 distinct fractions. These were caracterised using elemental, delta C-13, FTIR, and C-13 NMR analyses. Emphasis is placed on results for two years of incubation but to some extent data are compared with those for similar fractions taken after one year of incubation. Amounts of maize-derived organic carbon in the humic (HA) and fulvic (FA) isolates were more than twice those in the fractions after one year of incubation. The NMR results highlighted compositional differences between the fractions and showed increased contributions of lignin to the HAs and FAs (and especially in the cases of the HAs) as pH increased, and it was evident that humification was taking place after two years of incubation. The most recalcitrant humin fraction, isolated in the final solvent in the sequence, dimethylsulphoxide (DMSO) and sulfuric acid, is composed predominantly of methylene moieties, is compositionally and structurally very different from the humic and hydrophilic isolates, but identical to that which did not dissolve in the solvent. That suggests that exhaustively pre-extracting soil with the NaOH/urea solvent system used will allow a truly representative humin to be obtained using the DMSO/acid solvent system. MenosMaize (Zea mays) stover, with its natural C-13 abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of C-13 in the maize amendment allowed the contributions of the stover to be traced in the components of soil organic matter (SOM) isolated and fractionated using a sequential exhaustive extraction (SEE) process that gave 16 distinct fractions. These were caracterised using elemental, delta C-13, FTIR, and C-13 NMR analyses. Emphasis is placed on results for two years of incubation but to some extent data are compared with those for similar fractions taken after one year of incubation. Amounts of maize-derived organic carbon in the humic (HA) and fulvic (FA) isolates were more than twice those in the fractions after one year of incubation. The NMR results highlighted compositional differences between the fractions and showed increased contributions of lignin to the HAs and FAs (and especially in the cases of the HAs) as pH increased, and it was evident that humification was taking place after two years of incubation. The most recalcitrant humin fraction, isolated in the final solvent in the sequence, dimethylsulphoxide (DMSO) and sulfuric acid, is composed predominantly of methylene moieties, is compositionally and structurally very different from the humic and hydrophilic isolates, but identical to that which did not dissolve in th... Mostrar Tudo |
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Palavras-Chave: |
FTIR; NMR. |
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Thesagro: |
Extração; Matéria Orgânica; Solo. |
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Thesaurus NAL: |
Humification; Humin; Soil organic matter. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02519naa a2200253 a 4500
001 2127173
005 2021-02-11
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.scitotenv.2020.143034$2DOI
100 1 $aSONG, G.
245 $aA two-year incubation study of transformations of crop residues into soil organic matter (SOM) and a procedure for the sequential isolation and the fractionation of components of SOM.$h[electronic resource]
260 $c2021
520 $aMaize (Zea mays) stover, with its natural C-13 abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of C-13 in the maize amendment allowed the contributions of the stover to be traced in the components of soil organic matter (SOM) isolated and fractionated using a sequential exhaustive extraction (SEE) process that gave 16 distinct fractions. These were caracterised using elemental, delta C-13, FTIR, and C-13 NMR analyses. Emphasis is placed on results for two years of incubation but to some extent data are compared with those for similar fractions taken after one year of incubation. Amounts of maize-derived organic carbon in the humic (HA) and fulvic (FA) isolates were more than twice those in the fractions after one year of incubation. The NMR results highlighted compositional differences between the fractions and showed increased contributions of lignin to the HAs and FAs (and especially in the cases of the HAs) as pH increased, and it was evident that humification was taking place after two years of incubation. The most recalcitrant humin fraction, isolated in the final solvent in the sequence, dimethylsulphoxide (DMSO) and sulfuric acid, is composed predominantly of methylene moieties, is compositionally and structurally very different from the humic and hydrophilic isolates, but identical to that which did not dissolve in the solvent. That suggests that exhaustively pre-extracting soil with the NaOH/urea solvent system used will allow a truly representative humin to be obtained using the DMSO/acid solvent system.
650 $aHumification
650 $aHumin
650 $aSoil organic matter
650 $aExtração
650 $aMatéria Orgânica
650 $aSolo
653 $aFTIR
653 $aNMR
700 1 $aHAYES, M. H. B.
700 1 $aNOVOTNY, E. H.
773 $tScience of the Total Environment$gv. 763, 143034, Apr. 2021.
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Embrapa Solos (CNPS) |
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