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Registro Completo |
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Biblioteca(s): |
Embrapa Clima Temperado; Embrapa Soja; Embrapa Solos. |
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Data corrente: |
25/04/1995 |
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Data da última atualização: |
24/10/2003 |
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Autoria: |
GOEDERT, W. J. |
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Título: |
Cation equilibria in soils of Rio Grande do Sul, Brazil. |
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Ano de publicação: |
1973 |
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Fonte/Imprenta: |
1973. |
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Páginas: |
200 f. |
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Idioma: |
Inglês |
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Notas: |
Thesis (Doctor of Philosophy in Soil Science) - University of Wisconsin. |
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Conteúdo: |
A methor was developed by wich availability indices for any or all of the important soil cations can be estimated from a single equilibration with a 0.001M SrCl2 solution. Parameters derived from this system include intensity factors (activities and activity ratios) and capacity factors (exchangeable levels and buffering capacities) for each of the cations analyzed in the equilibrium solution. The method was used to determine the status of K, Mg, and Ca of some representative agricultural soils of Rio Grande do Sul, Brazil. The only condition required is that the selectivity coefficients between Sr and K, Mg and Ca are known in advance. The selectivity coefficients for seventy soil samples (obtained by applying ten treatments to seven soils), expressed as average and standard deviation, were KSRCa = 0.98 +- .09, Kca+Sr Mg = 0.68 +- .16 and KDK = 0.17 +- .06. The use of an average to represent all soils my be satisfactory, however, corrected selectivity coefficients can be obtained as a function of the soil organic matter content and the pH of the equilibrium solution. |
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Palavras-Chave: |
Equilibrio; Rio Grande doSul. |
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Thesagro: |
Acidez; Cátion; Fertilidade; Potássio; Solo. |
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Categoria do assunto: |
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Marc: |
LEADER 01649nam a2200217 a 4500
001 1465738
005 2003-10-24
008 1973 bl uuuu m 00u1 u #d
100 1 $aGOEDERT, W. J.
245 $aCation equilibria in soils of Rio Grande do Sul, Brazil.
260 $a1973.$c1973
300 $a200 f.
500 $aThesis (Doctor of Philosophy in Soil Science) - University of Wisconsin.
520 $aA methor was developed by wich availability indices for any or all of the important soil cations can be estimated from a single equilibration with a 0.001M SrCl2 solution. Parameters derived from this system include intensity factors (activities and activity ratios) and capacity factors (exchangeable levels and buffering capacities) for each of the cations analyzed in the equilibrium solution. The method was used to determine the status of K, Mg, and Ca of some representative agricultural soils of Rio Grande do Sul, Brazil. The only condition required is that the selectivity coefficients between Sr and K, Mg and Ca are known in advance. The selectivity coefficients for seventy soil samples (obtained by applying ten treatments to seven soils), expressed as average and standard deviation, were KSRCa = 0.98 +- .09, Kca+Sr Mg = 0.68 +- .16 and KDK = 0.17 +- .06. The use of an average to represent all soils my be satisfactory, however, corrected selectivity coefficients can be obtained as a function of the soil organic matter content and the pH of the equilibrium solution.
650 $aAcidez
650 $aCátion
650 $aFertilidade
650 $aPotássio
650 $aSolo
653 $aEquilibrio
653 $aRio Grande doSul
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Registro original: |
Embrapa Soja (CNPSO) |
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| Registros recuperados : 110 | |
| 3. |  | GOEDERT, W. J. Calagem e adubação. Brasília, DF: EMBRAPA-SPI; Planaltina, DF: EMBRAPA-CPAC, 1995. 59 p. il. (Colecao Saber, 1).| Biblioteca(s): Embrapa Cerrados; Embrapa Unidades Centrais. |
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| 8. | | GOEDERT, W. J. Estrategias de manejo das savannas. In: SARMIENTO, G. (Comp.). Las sabanas americanas: aspecto de su biogeografia, ecologia y utilizacion. Merida: Universidad de Los Andes, 1990. p.191-218. Apresentado no Simposio organizado em Guanare, Venezuela, sob os auspicios do Pograma Decada de los Tropicos (IUBS, MAB-UNESCO).| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 110 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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