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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
22/11/2004 |
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Data da última atualização: |
22/11/2004 |
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Autoria: |
BRÂNCIO, P. A.; NASCIMENTO JÚNIOR, D. do; EUCLIDES, V. P. B.; REGAZZI, A. J.; ALMEIDA, R. G.; FONSECA, D. M. |
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Título: |
Valor nutritivo da forragem disponível e da dieta selecionada por bovinos em pastagens de cultivares de Panicum maximum Jacq. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 38., 2001, Piracicaba. Anais... Piracicaba: FEALQ, 2001. |
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Páginas: |
P. 222-223. |
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Idioma: |
Português |
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Notas: |
CNPGC. SBZ.
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Conteúdo: |
O estudo teve como objetivo avaliar pastagens de três cultivares de Panicum maximum Jacq. submetidas ao pastejo rotativo, quanto ao valor nutritivo, estimando-se os teores de proteína bruta e fibra em detergente neutro e digestibilidade em amostras da forragem disponível no pasto e em amostras selecionadas por bovinos fistulados no esôfago. Estudou-se também, na cultivar Tanzânia, a adubação nitrogenada no final do período chuvoso, adicional a de manutenção comum ás demais cultivares. As amostragens foram realizadas em junho, setembro e novembro de 1998 e março de 1999. Algumas diferenças entre tratamentos foram observadas, apresentando em geral, menor valor nutritivo da cv. Massai, com menores teores de proteína bruta e digestibilidade e maiores teores de fibra em detergente neutro nas amostras de folha, colmo e extrusa. Verificou-se efeito positivo da adubação nitrogenada adicional no teor de proteína bruta das folhas, em março de 1999. Em todos os tratamento, os animais foram capazes de selecionar dieta de maior valor nutritivo que a forragem disponível. |
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Palavras-Chave: |
Massai; Mombaça. |
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Thesagro: |
Bovino; Panicum Maximum; Pastagem; Pastejo Rotativo; Valor Nutritivo. |
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Thesaurus Nal: |
cattle; nutritive value; pastures; rotational grazing; Tanzania. |
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Categoria do assunto: |
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Marc: |
LEADER 02125naa a2200349 a 4500
001 1325634
005 2004-11-22
008 2001 bl uuuu u00u1 u #d
100 1 $aBRÂNCIO, P. A.
245 $aValor nutritivo da forragem disponível e da dieta selecionada por bovinos em pastagens de cultivares de Panicum maximum Jacq.
260 $c2001
300 $aP. 222-223.
500 $aCNPGC. SBZ.
520 $aO estudo teve como objetivo avaliar pastagens de três cultivares de Panicum maximum Jacq. submetidas ao pastejo rotativo, quanto ao valor nutritivo, estimando-se os teores de proteína bruta e fibra em detergente neutro e digestibilidade em amostras da forragem disponível no pasto e em amostras selecionadas por bovinos fistulados no esôfago. Estudou-se também, na cultivar Tanzânia, a adubação nitrogenada no final do período chuvoso, adicional a de manutenção comum ás demais cultivares. As amostragens foram realizadas em junho, setembro e novembro de 1998 e março de 1999. Algumas diferenças entre tratamentos foram observadas, apresentando em geral, menor valor nutritivo da cv. Massai, com menores teores de proteína bruta e digestibilidade e maiores teores de fibra em detergente neutro nas amostras de folha, colmo e extrusa. Verificou-se efeito positivo da adubação nitrogenada adicional no teor de proteína bruta das folhas, em março de 1999. Em todos os tratamento, os animais foram capazes de selecionar dieta de maior valor nutritivo que a forragem disponível.
650 $acattle
650 $anutritive value
650 $apastures
650 $arotational grazing
650 $aTanzania
650 $aBovino
650 $aPanicum Maximum
650 $aPastagem
650 $aPastejo Rotativo
650 $aValor Nutritivo
653 $aMassai
653 $aMombaça
700 1 $aNASCIMENTO JÚNIOR, D. do
700 1 $aEUCLIDES, V. P. B.
700 1 $aREGAZZI, A. J.
700 1 $aALMEIDA, R. G.
700 1 $aFONSECA, D. M.
773 $tIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 38., 2001, Piracicaba. Anais... Piracicaba: FEALQ, 2001.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
12/01/2009 |
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Data da última atualização: |
06/04/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
NOVOTNY, E. H.; HAYES, M. H. B.; SONG, G.; AZEVEDO, E. R. de; BONAGAMBA, T. |
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Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL HILARY B. HAYES, UNIVERSITY OF LIMERICK; GUIXUE SONG, UNIVERSITY OF LIMERICK; EDUARDO RIBEIRO DE AZEVEDO, USP; TITO JOSÉ BONAGAMBA, USP. |
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Título: |
Extraction and characterisation of humin fraction from Amazonian anthropogenic dark earth soils ("Terra Preta de Indios"). |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 14., 2008, Saint Petersburg. From molecular understanding to innovative applications of humic substances: proceedings... Moscow: Lomonosov Moscow State University, 2008. v. 1, p. 105-108. |
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Idioma: |
Inglês |
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Conteúdo: |
Humin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons are highly mobile in H 2SO4. This enables it to protonate the conjugate bases (carboxylates and phenolates), thereby increasing the solubility of the organic material (4, 5), since anions are weakly solvated in DMSO. MenosHumin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons a... Mostrar Tudo |
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Palavras-Chave: |
black carbon; indios; NMR; pyrogenic carbon. |
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Thesaurus NAL: |
humin; terra preta. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/334758/1/Extraction-and-characterization-of-humin-fraction-2008.pdf
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Marc: |
LEADER 02605nam a2200229 a 4500
001 1334758
005 2022-04-06
008 2008 bl uuuu u00u1 u #d
100 1 $aNOVOTNY, E. H.
245 $aExtraction and characterisation of humin fraction from Amazonian anthropogenic dark earth soils ("Terra Preta de Indios").$h[electronic resource]
260 $aIn: INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 14., 2008, Saint Petersburg. From molecular understanding to innovative applications of humic substances: proceedings... Moscow: Lomonosov Moscow State University, 2008. v. 1, p. 105-108.$c2008
520 $aHumin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons are highly mobile in H 2SO4. This enables it to protonate the conjugate bases (carboxylates and phenolates), thereby increasing the solubility of the organic material (4, 5), since anions are weakly solvated in DMSO.
650 $ahumin
650 $aterra preta
653 $ablack carbon
653 $aindios
653 $aNMR
653 $apyrogenic carbon
700 1 $aHAYES, M. H. B.
700 1 $aSONG, G.
700 1 $aAZEVEDO, E. R. de
700 1 $aBONAGAMBA, T.
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Embrapa Solos (CNPS) |
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