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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
24/08/1995 |
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Data da última atualização: |
08/07/2013 |
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Autoria: |
OLSEN, S. R.; WATANABE, F. S. |
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Título: |
Diffusive supply of phosphorus in relation to soil textural variations. |
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Ano de publicação: |
1970 |
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Fonte/Imprenta: |
Soil Science, v.110, n.5, p.318-327, 1970. |
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Idioma: |
Inglês |
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Conteúdo: |
A method is outline to determine how much fertilizer P will be required to equalize the phosphate-supplying power to roots growing in three soils of different texture or adsorptive capacities. An equations based on diffusion and concentration of P is presented to assess the relative P-supplying power of the soils. This equation takes into account (a) an intensity factor, (b) a capacity factor, (c) the rate of diffusion, and (d) the need for P set by the plant. The concentration of P in the soil solution necessary to supply equal of P uptake by a given set of roots varies from 3.5 uM in Pierre clay to 27.3 uM in the Tripp fine sandy loam. The potential, p(H2PO4 + HPO4), required to supply equal rates of P uptake were 5.92, 5.60, and 5.17 for the Pierre clay, Apishapa silty clay loam, and Tripp fine sandy loam, respectively. The fertilizer P (as concentrated superphosphate) required to attain these P concentrations is 40 ppm. on the Pierre compared with 20 ppm. on the Tripp. These amounts of fertilizer P, calculated from the diffusion equation, agree well with the yield response to applied P in a greenhouse trial. The methods described here suggest a logical
basis for recommending variable rates of fertilizer P which depends on soil properties such as texture or P adsorptive capacity. This approach has not been tested, however, by field trials. |
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Palavras-Chave: |
Fertility. |
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Thesagro: |
Fertilidade; Fósforo; Solo. |
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Thesaurus Nal: |
phosphorus; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01882naa a2200205 a 4500
001 1785800
005 2013-07-08
008 1970 bl --- 0-- u #d
100 1 $aOLSEN, S. R.
245 $aDiffusive supply of phosphorus in relation to soil textural variations.
260 $c1970
520 $aA method is outline to determine how much fertilizer P will be required to equalize the phosphate-supplying power to roots growing in three soils of different texture or adsorptive capacities. An equations based on diffusion and concentration of P is presented to assess the relative P-supplying power of the soils. This equation takes into account (a) an intensity factor, (b) a capacity factor, (c) the rate of diffusion, and (d) the need for P set by the plant. The concentration of P in the soil solution necessary to supply equal of P uptake by a given set of roots varies from 3.5 uM in Pierre clay to 27.3 uM in the Tripp fine sandy loam. The potential, p(H2PO4 + HPO4), required to supply equal rates of P uptake were 5.92, 5.60, and 5.17 for the Pierre clay, Apishapa silty clay loam, and Tripp fine sandy loam, respectively. The fertilizer P (as concentrated superphosphate) required to attain these P concentrations is 40 ppm. on the Pierre compared with 20 ppm. on the Tripp. These amounts of fertilizer P, calculated from the diffusion equation, agree well with the yield response to applied P in a greenhouse trial. The methods described here suggest a logical basis for recommending variable rates of fertilizer P which depends on soil properties such as texture or P adsorptive capacity. This approach has not been tested, however, by field trials.
650 $aphosphorus
650 $asoil
650 $aFertilidade
650 $aFósforo
650 $aSolo
653 $aFertility
700 1 $aWATANABE, F. S.
773 $tSoil Science$gv.110, n.5, p.318-327, 1970.
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Registro original: |
Embrapa Pantanal (CPAP) |
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