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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
17/10/2011 |
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Autoria: |
AMER, F.; BOULDIN, D. R.; BLACK, C. A.; DUKE, F. R. |
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Título: |
Characterization of soil phosphorus by anion exchange resin adsorption and P32-equilibration. |
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Ano de publicação: |
1955 |
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Fonte/Imprenta: |
Plant and Soil, The Hague, v. 6, n. 4, p. 391-408, 1955. |
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Idioma: |
Inglês |
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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. |
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Thesagro: |
Análise; Fósforo; Solo. |
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Categoria do assunto: |
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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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| Registros recuperados : 8 | |
| 6. |  | BURLE, M. L.; LATHWELL, D. J.; SUHET, A. R.; BOULDIN, D. R.; BOWEN, W. T.; RESCK, D. V. S. Legume survival during the dry season and its effect on the succeeding maize yield in acid savannah tropical soils. Tropical Agriculture, Trinidad, v.76, n.4, p.217-221, 1999.| Biblioteca(s): Embrapa Cerrados. |
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| 8. | | BURLE, M. L.; SUHET, A. R.; PEREIRA, J.; RESCK, D. V. S.; PERES, J. R. R.; CRAVO, M. S.; BOWEN, W.; BOULDIN, D. R.; LATHWELL, D. J. Legume green manures: dry-season survival and the effect on succeeding maize crops. Roleigh, NC: Soil Management CRSP, 1992. 35p. (Soil Management CRSP Bulletin 92-04).| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 8 | |
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