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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
10/08/1995 |
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Data da última atualização: |
10/08/1995 |
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Autoria: |
EL-SAYED, M.H. |
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Título: |
A critical examination of phosphurus release from the soil. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Egyptian Journal of Soil Science, Special Issue, p.115-127, 1975. |
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Idioma: |
Inglês |
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Conteúdo: |
Hagin's equation was found to be inadequate for describing phhosphorus release from the soil by either continuous leaching or repeated batch extraction. Accordingly, the significan-
ce of the socalled maximum release derived from this equation as a parameter for phosphorus supplying power of the soil is questionable since it was shown to be a function
of the extraction number. Phosphorus release was described by an alternative expression
that reflects two simultaneous behaviours whereby the extracted P may assume either a
logarithmic or a linear pattern in the course of extraction. Desorption of surface phosphates
and dissolution of some chemical compounds were presumed to be corresponding proces-
ses, respectively. Initially, the two processes participate in P release until the surface component is exhausted whereupon the release is essentially due to dissolution. The amounts of P desorbed could be obtained by substracting the dissolution P from the amounts released in the successive initial extracts. This picture was substantiated by fin-
ding that the intermittent wetting-and - drying extraction provoked more P release with the
logarithmic reaction than did the continuous-wettin technique while the reverse was true with the linear reaction; a result that can be expected on thermodynamic grounds. A model
consistent with these results was proposed whereby the surface component of soil phosphorus could be estimated. The model is analogous to that used in solvent extraction and assumes a constant distribution ratio between P in the solid and liquid phases during
the extraction. This method appears to be promising for characterization of a readily-labile component of soil phosphorus as deduced from the low values obtained for the distribu-
tion ratio. The method merits further investigations to correlate this immediately available phosphorus with plant uptake. MenosHagin's equation was found to be inadequate for describing phhosphorus release from the soil by either continuous leaching or repeated batch extraction. Accordingly, the significan-
ce of the socalled maximum release derived from this equation as a parameter for phosphorus supplying power of the soil is questionable since it was shown to be a function
of the extraction number. Phosphorus release was described by an alternative expression
that reflects two simultaneous behaviours whereby the extracted P may assume either a
logarithmic or a linear pattern in the course of extraction. Desorption of surface phosphates
and dissolution of some chemical compounds were presumed to be corresponding proces-
ses, respectively. Initially, the two processes participate in P release until the surface component is exhausted whereupon the release is essentially due to dissolution. The amounts of P desorbed could be obtained by substracting the dissolution P from the amounts released in the successive initial extracts. This picture was substantiated by fin-
ding that the intermittent wetting-and - drying extraction provoked more P release with the
logarithmic reaction than did the continuous-wettin technique while the reverse was true with the linear reaction; a result that can be expected on thermodynamic grounds. A model
consistent with these results was proposed whereby the surface component of soil phosphorus could be estimated. The model is analogous to that used in solvent extraction ... Mostrar Tudo |
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Palavras-Chave: |
Critical examination; Exame critico; Fertility; Hagin's equation. |
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Thesagro: |
Fertilidade; Fósforo; Solo. |
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Thesaurus Nal: |
phosphorus; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02488naa a2200229 a 4500
001 1785462
005 1995-08-10
008 1977 bl --- 0-- u #d
100 1 $aEL-SAYED, M.H.
245 $aA critical examination of phosphurus release from the soil.
260 $c1977
520 $aHagin's equation was found to be inadequate for describing phhosphorus release from the soil by either continuous leaching or repeated batch extraction. Accordingly, the significan- ce of the socalled maximum release derived from this equation as a parameter for phosphorus supplying power of the soil is questionable since it was shown to be a function of the extraction number. Phosphorus release was described by an alternative expression that reflects two simultaneous behaviours whereby the extracted P may assume either a logarithmic or a linear pattern in the course of extraction. Desorption of surface phosphates and dissolution of some chemical compounds were presumed to be corresponding proces- ses, respectively. Initially, the two processes participate in P release until the surface component is exhausted whereupon the release is essentially due to dissolution. The amounts of P desorbed could be obtained by substracting the dissolution P from the amounts released in the successive initial extracts. This picture was substantiated by fin- ding that the intermittent wetting-and - drying extraction provoked more P release with the logarithmic reaction than did the continuous-wettin technique while the reverse was true with the linear reaction; a result that can be expected on thermodynamic grounds. A model consistent with these results was proposed whereby the surface component of soil phosphorus could be estimated. The model is analogous to that used in solvent extraction and assumes a constant distribution ratio between P in the solid and liquid phases during the extraction. This method appears to be promising for characterization of a readily-labile component of soil phosphorus as deduced from the low values obtained for the distribu- tion ratio. The method merits further investigations to correlate this immediately available phosphorus with plant uptake.
650 $aphosphorus
650 $asoil
650 $aFertilidade
650 $aFósforo
650 $aSolo
653 $aCritical examination
653 $aExame critico
653 $aFertility
653 $aHagin's equation
773 $tEgyptian Journal of Soil Science, Special Issue, p.115-127, 1975.
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Esconder MarcMostrar Marc Completo |
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Registro original: |
Embrapa Pantanal (CPAP) |
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Biblioteca |
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Registro |
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| Registros recuperados : 20.739 | |
| 201. |  | DIECKOW, J.; BAYER, C.; CONCEIÇÃO, P. C.; ZANATTA, J. A.; MARTIN NETO, L.; MILORI, D. M. B. P.; SALTON, J. C.; MACEDO, M. M.; MIELNICZUK, J.; HERNANI, L. C. Land use, tillage, texture and organic matter stock and composition in tropical and subtropical brazilian soils. European journal of soil science, Oxford, v. 60, p. 240-249, 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
|   |
| 202. | | CARMO, M. L. do; PROCÓPIO, S de O.; PIRES, F. R.; CARGNELUTTI FILHO, A.; BRAZ, G. B. P.; SILVA, W. F. P.; BARROSO, A. L. L.; SILVA, G. P.; CARMO, E. L. do; BRAZ, A. J. B. P.; ASSIS, R. L. Influência do período de cultivo de Panicum meximum (cultivar Tanzânia) na fitorremediação de solo contaminado com picloram. Planta Daninha, Viçosa, v. 26, n. 2, p. 315-322, 2008.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - A |
| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
|  |
| 206. | | DOLATTO, R. G.; MESSERSCHMIDT, I.; PEREIRA, B. F.; OLIVEIRA, T. de; PILLON, C. N.; ABATE, G. Interaction of Phenol, o-Cresol, and p-Cresol with a Clay-Rich Soil Sample. Journal of Agricultural and Food Chemistry, v. 58, n. 4, p. 2426-2432, 2010.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Clima Temperado. |
| |
| 210. | | SOUZA, F. R. de; ROSA JUNIOR, E. J.; FIETZ, C. R.; BERGAMIN, A. C.; MELO, J. S. de; SANTANA, D. R. S. Índice S de um Latossolo Vermelho distroférrico submetido ao tráfego de trator agrícola e sistemas de manejo. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 34., 2013, Florianópolis. Ciência do solo: para quê e para quem: anais. Viçosa, MG: Sociedade Brasileira de Ciência do Solo, 2013.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
|  |
| 211. | | TRINDADE NETO, R. B. da; CRUZ, C. R. S. da; BARBOSA, A. F.; XAVIER, F. A. da S.; SOUZA, L. D. Incorporação de cama de aviário e carvão vegetal aumenta a capacidade de retenção de água de um Latossolo Amarelo cultivado com abacaxizeiro. In: CIENTÍFICA EMBRAPA MANDIOCA E FRUTICULTURA, 15., 2021. Mulheres na ciência desafios, oportunidades e conquistas. Cruz das Almas, BA: Embrapa Mandioca e Fruticultura, 2021. 109 f. il. PDF.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 214. | | BLANCHART, E.; ALBRECHT, A.; BROWN, G.; DECAENS, T.; DUBOISSET, A.; LAVELLE, P.; MARIANI, L.; ROOSE, E. Effects of tropical endogeic earthworms on soil erosion. Agriculture, Ecosystems & Environment, v. 104, n. 2, p. 303-315, Oct. 2004. Nome correto do terceiro autor: BROWN, G. G.| Biblioteca(s): Embrapa Soja. |
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| 217. | | SOUZA, L. da S.; BORGES, A. L.; SOUZA, L. D.; CARVALHO, J. E. B. de. Manejo e conservação do solo. In: BORGES, A. L.; SOUZA, L. da S.; (Ed.). Recomendações de calagem e adubação para abacaxi, acerola, banana, laranja, tangerina, lima ácida, mamão, mandioca, manga e maracujá. Cruz das Almas: Embrapa Mandioca e Fruticultura Tropical, 2009. p. 11-21.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 218. | | FEIDEN, A. Manejo ecológico do solo. In: PADOVAN, M. P.; URCHEI, M. A.; MERCANTE, F. M.; CARDOSO, S. (Ed.). Agroecologia em Mato Grosso do Sul: princípios, fundamentos e experiências. Dourados: Embrapa Agropecuária Oeste, 2005. p. 57-65.| Biblioteca(s): Embrapa Agrobiologia. |
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| 219. | | GIACOMINI, S. J.; SILVEIRA, C. A. P. Manejo da Fertilidade do Solo. In: SILVA, S. D. dos A. e; MONTERO, C. R. S.; SANTOS, R. C. dos.; NAVA, D. E.; GOMES, C. B.; ALMEIDA, I. R. de (Ed.). Sistema de produção de cana-de-açúcar no Rio Grande do Sul. Pelotas: Embrapa Clima Temperado, 2016. 247 p. (Embrapa Clima Temperado. Sistemas de produção, 23.) p. 58-74| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Clima Temperado. |
| |
| Registros recuperados : 20.739 | |
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