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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: |
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7. |  | GOMIDE, R. L.; MAENO, P. Requerimento de água pelas culturas. In: ALBUQUERQUE, P. E. P. de; DURÃES, F. O. M. (Ed.). Uso e manejo de irrigação. Brasília, DF: Embrapa Informação Tecnológica; Sete Lagoas: Embrapa Milho e Sorgo, 2008. cap. 5, p. 225-253.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Milho e Sorgo. |
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10. |  | GOMIDE, R. L.; DURAES, F. O. M. Caracterização de estresse hídrico de duas linhagens de milho (Zea mays L.) com sondas de fluxo de seiva. In: CONGRESSO NACIONAL DE MILHO E SORGO, 25.; SIMPOSIO BRASILEIRO SOBRE A LAGARTA-DO-CARTUCHO, SPODOPTERA FRUGIPERDA, 1., 2004, Cuiabá, MT. Da agricultura familiar ao agronegócio: tecnologia, competitividade e sustentabilidade: [resumos expandidos]. Sete Lagoas: ABMS: Embrapa Milho e Sorgo; Cuiabá: Empaer, 2004. 1 CD-ROM.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Milho e Sorgo. |
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Registros recuperados : 158 | |
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