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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
14/07/1992 |
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Data da última atualização: |
14/07/1992 |
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Autoria: |
FASSBENDER, H. W.; IGUE, K. |
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Afiliação: |
IICA. |
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Título: |
Comparacion de metodos radiometricos y colorimetricos en estudios sobre retencion y transformacion de fosfatos en el suelo. |
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Ano de publicação: |
1967 |
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Fonte/Imprenta: |
Turrialba, v.17, n.3, p.284-287, 1967. |
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Idioma: |
Inglês |
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Conteúdo: |
The colorimetric and tracer techniques for phosphate retention and transformation in soils were compared in 10 soil samples from Costa Rica. Phosphate retention was determinated by shaking 0.5g soil with 25 ml of a KH2PO4 solution tagged with 32 P and containing 100 ug P/ml. The transformation of phosphates was investigated by chang and Jackson's fractionation technique and the P in the different extractions was determinated colorimetrically and by its radioactivity. The retention results obtained with the two methods were almost identical and the correlation coefficient between both was 0.998. For the data on P transformation, high correlations were found for aluminium and iron phosphate and the NH4Cl soluble fraction. For the calcium phosphate fraction, which is of very little importance in these soils, no significant correlation could be found. Based on the data, the colorimetric and the tracer method are equally adecuate. However, the use of the tracer technique permits more rapid and accurate determinations. The authors. |
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Palavras-Chave: |
Phosphate. |
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Thesagro: |
Fosfato; Solo. |
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Thesaurus Nal: |
soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01547naa a2200181 a 4500
001 1457609
005 1992-07-14
008 1967 bl --- 0-- u #d
100 1 $aFASSBENDER, H. W.
245 $aComparacion de metodos radiometricos y colorimetricos en estudios sobre retencion y transformacion de fosfatos en el suelo.
260 $c1967
520 $aThe colorimetric and tracer techniques for phosphate retention and transformation in soils were compared in 10 soil samples from Costa Rica. Phosphate retention was determinated by shaking 0.5g soil with 25 ml of a KH2PO4 solution tagged with 32 P and containing 100 ug P/ml. The transformation of phosphates was investigated by chang and Jackson's fractionation technique and the P in the different extractions was determinated colorimetrically and by its radioactivity. The retention results obtained with the two methods were almost identical and the correlation coefficient between both was 0.998. For the data on P transformation, high correlations were found for aluminium and iron phosphate and the NH4Cl soluble fraction. For the calcium phosphate fraction, which is of very little importance in these soils, no significant correlation could be found. Based on the data, the colorimetric and the tracer method are equally adecuate. However, the use of the tracer technique permits more rapid and accurate determinations. The authors.
650 $asoil
650 $aFosfato
650 $aSolo
653 $aPhosphate
700 1 $aIGUE, K.
773 $tTurrialba$gv.17, n.3, p.284-287, 1967.
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Registro original: |
Embrapa Soja (CNPSO) |
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| Registros recuperados : 2 | |
| 2. |  | PALHANO, J. B.; MUZILLI, O.; IGUE, K.; GARCIA, A.; SFREDO, G. J. Adubacao fosfatada e potassica em cultura de soja no Estado do Parana. Pesquisa Agropecuaria Brasileira, Brasilia, DF, v.18, n.4, p.357-362, abr. 1983.| Biblioteca(s): Embrapa Soja; Embrapa Unidades Centrais. |
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| Registros recuperados : 2 | |
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