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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: |
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Embrapa Trigo (CNPT) |
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