| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Leite. |
|
Data corrente: |
29/07/1992 |
|
Data da última atualização: |
29/07/1992 |
|
Autoria: |
SCHUH, G. E. |
|
Título: |
Costs and benefits of agricultural research: state of the art and implications for the CGIAR. |
|
Ano de publicação: |
1978 |
|
Fonte/Imprenta: |
[S.l.: s.n.], 1978. |
|
Páginas: |
73p. |
|
Idioma: |
Inglês |
|
Palavras-Chave: |
Beneficio; Benefit; Cost. |
|
Thesagro: |
Agricultura; Custo; Pesquisa. |
|
Thesaurus Nal: |
agriculture; research. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 00523nam a2200205 a 4500
001 1588409
005 1992-07-29
008 1978 bl uuuu 00u1 u #d
100 1 $aSCHUH, G. E.
245 $aCosts and benefits of agricultural research$bstate of the art and implications for the CGIAR.
260 $a[S.l.: s.n.], 1978.$c1978
300 $a73p.
650 $aagriculture
650 $aresearch
650 $aAgricultura
650 $aCusto
650 $aPesquisa
653 $aBeneficio
653 $aBenefit
653 $aCost
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Leite (CNPGL) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Cerrados. |
|
Data corrente: |
06/04/2006 |
|
Data da última atualização: |
26/10/2009 |
|
Autoria: |
MARTINS, J. C.; MARTINS, E. de S.; REATTO, A. |
|
Título: |
Revisão de intemperismo de micas. |
|
Ano de publicação: |
2004 |
|
Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2004. |
|
Páginas: |
48 p. |
|
Série: |
(Embrapa Cerrados. Documentos, 123). |
|
Idioma: |
Português |
|
Conteúdo: |
ABSTRACT: The micas are rock forming mineral of the phyllosillicates group. The weathering of these minerals is fundamental in the understanding of potassium, silicon and magnesium liberation processes to the soil. the existent studies shown that the main factors that control the micas weathering are the pH of the solutions, the temperature, the size of the particles and the superficial area. The micas weathering is incongruous, in other words, always new minerals are formed as dissolution products, as vermiculite, kaolinite and goethite. These products can precipitate in the surface of the mica, especially the iron oxides of iron, and they impede the contact with its surface, reducing the dissolution kinetics. The structure of the micas is also a decisive factor in the dissolution kinetics. The dissolution kinetics presents the following decreasing order: phlogopite, biotite, and muscovite. |
|
Palavras-Chave: |
Dissolução mineral; Experimental models; Intemperismo; Mineral dissolution; Modelo experimental. |
|
Thesagro: |
Geologia; Mineralogia; Pedologia; Rocha; Solo. |
|
Thesaurus NAL: |
mineralogy; soil; weathering. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/26903/1/doc_123.pdf
|
|
Marc: |
LEADER 01687nam a2200313 a 4500
001 1568958
005 2009-10-26
008 2004 bl uuuu u0uu1 u #d
100 1 $aMARTINS, J. C.
245 $aRevisão de intemperismo de micas.
260 $aPlanaltina, DF: Embrapa Cerrados$c2004
300 $a48 p.
490 $a(Embrapa Cerrados. Documentos, 123).
520 $aABSTRACT: The micas are rock forming mineral of the phyllosillicates group. The weathering of these minerals is fundamental in the understanding of potassium, silicon and magnesium liberation processes to the soil. the existent studies shown that the main factors that control the micas weathering are the pH of the solutions, the temperature, the size of the particles and the superficial area. The micas weathering is incongruous, in other words, always new minerals are formed as dissolution products, as vermiculite, kaolinite and goethite. These products can precipitate in the surface of the mica, especially the iron oxides of iron, and they impede the contact with its surface, reducing the dissolution kinetics. The structure of the micas is also a decisive factor in the dissolution kinetics. The dissolution kinetics presents the following decreasing order: phlogopite, biotite, and muscovite.
650 $amineralogy
650 $asoil
650 $aweathering
650 $aGeologia
650 $aMineralogia
650 $aPedologia
650 $aRocha
650 $aSolo
653 $aDissolução mineral
653 $aExperimental models
653 $aIntemperismo
653 $aMineral dissolution
653 $aModelo experimental
700 1 $aMARTINS, E. de S.
700 1 $aREATTO, A.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Cerrados (CPAC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
