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Registro Completo |
Biblioteca(s): |
Embrapa Trigo. |
Data corrente: |
10/01/2010 |
Data da última atualização: |
17/10/2011 |
Autoria: |
AMER, F.; BOULDIN, D. R.; BLACK, C. A.; DUKE, F. R. |
Título: |
Characterization of soil phosphorus by anion exchange resin adsorption and P32-equilibration. |
Ano de publicação: |
1955 |
Fonte/Imprenta: |
Plant and Soil, The Hague, v. 6, n. 4, p. 391-408, 1955. |
Idioma: |
Inglês |
Conteúdo: |
Adsorption of phosphate by the anion-exchange resin Dowex-2 was investigated. The resin adsorbed small quantities of P from solution quantitatively. The rate of P-adsorption by resin agitated in solution was proportional to the P-concentration in solution, and was independent of the rate of diffusion of adsorbed P in the resin. When 1 g of soil was shaken continuously with 1 g of resin in 100 ml of water, the rate of P-adsorption by the resin was controlled by the rate of P-release from the soil. Quantities of P adsorbed from soil by resin after different lengths of time were less than those equilibrated with P32 during the same time intervals. The curves showing quantity of P adsorbed vs. time could be satisfactorily described by the hypothesis that there were three simultaneous reactions differing in rate, each reaction being first-order with respect to P. The same was true of the P32-equilibration data, except that the rate of the slowest reaction was apparently independent of time. In a group of 16 soils, the correlation between P adsorbed by the resin in 2 hours and P-availability to plants in the greenhouse, measured by the isotope-dilution method of Fried and Dean, was 0.95. The corresponding correlation between P extracted by the 0.25N HCl — 0.03N NH4F extractant of Bray and Kurtz was 0.91. |
Thesagro: |
Análise; Fósforo; Solo. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01848naa a2200193 a 4500 001 1827312 005 2011-10-17 008 1955 bl --- 0-- u #d 100 1 $aAMER, F. 245 $aCharacterization of soil phosphorus by anion exchange resin adsorption and P32-equilibration. 260 $c1955 520 $aAdsorption of phosphate by the anion-exchange resin Dowex-2 was investigated. The resin adsorbed small quantities of P from solution quantitatively. The rate of P-adsorption by resin agitated in solution was proportional to the P-concentration in solution, and was independent of the rate of diffusion of adsorbed P in the resin. When 1 g of soil was shaken continuously with 1 g of resin in 100 ml of water, the rate of P-adsorption by the resin was controlled by the rate of P-release from the soil. Quantities of P adsorbed from soil by resin after different lengths of time were less than those equilibrated with P32 during the same time intervals. The curves showing quantity of P adsorbed vs. time could be satisfactorily described by the hypothesis that there were three simultaneous reactions differing in rate, each reaction being first-order with respect to P. The same was true of the P32-equilibration data, except that the rate of the slowest reaction was apparently independent of time. In a group of 16 soils, the correlation between P adsorbed by the resin in 2 hours and P-availability to plants in the greenhouse, measured by the isotope-dilution method of Fried and Dean, was 0.95. The corresponding correlation between P extracted by the 0.25N HCl — 0.03N NH4F extractant of Bray and Kurtz was 0.91. 650 $aAnálise 650 $aFósforo 650 $aSolo 700 1 $aBOULDIN, D. R. 700 1 $aBLACK, C. A. 700 1 $aDUKE, F. R. 773 $tPlant and Soil, The Hague$gv. 6, n. 4, p. 391-408, 1955.
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1. | | ALVES, F. S. F.; PINHEIRO, R. R.; SANTIAGO, L. B.; SANTOS, W. W. S. dos; ESTEVES, G. I. F.; MOURA, C. J. de; BARROS, D. T. de. Avaliação do California Mastitis Test e da contagem de células somáticas para o diagnóstico da mastite subclínica caprina. In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 5.; SIMPÓSIO NORDESTINO DE ALIMENTAÇÃO DE RUMINANTES, 11.; SIMPÓSIO SERGIPANO DE PRODUÇÃO ANIMAL, 1., 2008, Aracaju. Anais... Aracaju: Sociedade Nordestina de Produção Animal; Embrapa Tabuleiros Costeiros, 2008. 3 f.1 CD ROM.Tipo: Artigo em Anais de Congresso |
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