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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
22/07/2002 |
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Data da última atualização: |
22/07/2002 |
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Autoria: |
CHAPUIS-LARDY, L.; BROSSARD, M.; QUIQUAMPOIX, H. |
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Título: |
Assessing organic phosphorus status of Cerrado oxisols (Brazil) using P-NMR spectroscopy and phosphomonoesterase activity measurement. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Candian Journal of Soil Science, Ottawa-Canada, v. 81, p. 591-601, 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
Plant production in the Brazilian savanas, also known as the Cerrados, is limited mainly by low P avaliability in soils. Little is known about the P status in the Cerrados region, despite its increasing significance for the contry's agriculture.
31P-NMR spectroscopy of alkali extracts and phosphomonoesterase (PME) acivity measurements were used to study forms of P and their stability in oxisols of natural and posture systems. Total P content (Pt) in topsoils ranged from 301 to 465 mg kg-1 and organic P content (Po) from 84 to 194 mg kg-1 with the highest values under natural vegetation. The estimation of forms of soil P with different lability (provided by NaHCO3 and NaOH extractions) showed little difference between natural vegetation and pastures, but the proportions of Po extracted suggest the importance of organically bound P as a source of plant-available P. All NMR spectra showed signals of organic P(monoesters and diesters) and inorganic P form(orthophosphate and phosphosphate), with little influence of land use. Organic P appears to be mainly in the form of stable phosphomonoesters. The most marked effect of land use was a decrease in PME activity under recent pastures, indicating na increase of PME stability in topsoils after the maize-grass ley plantation. The importance of the pH of the PME activity measurements is also discussed.
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Palavras-Chave: |
Soil testing. |
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Thesagro: |
Análise do Solo; Cerrado; Fertilidade do Solo; Fósforo; Pastagem; Solo. |
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Thesaurus Nal: |
pastures; phosphorus; soil; soil fertility. |
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Categoria do assunto: |
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Marc: |
LEADER 02156naa a2200277 a 4500
001 1565094
005 2002-07-22
008 2001 bl --- 0-- u #d
100 1 $aCHAPUIS-LARDY, L.
245 $aAssessing organic phosphorus status of Cerrado oxisols (Brazil) using P-NMR spectroscopy and phosphomonoesterase activity measurement.
260 $c2001
520 $aPlant production in the Brazilian savanas, also known as the Cerrados, is limited mainly by low P avaliability in soils. Little is known about the P status in the Cerrados region, despite its increasing significance for the contry's agriculture. 31P-NMR spectroscopy of alkali extracts and phosphomonoesterase (PME) acivity measurements were used to study forms of P and their stability in oxisols of natural and posture systems. Total P content (Pt) in topsoils ranged from 301 to 465 mg kg-1 and organic P content (Po) from 84 to 194 mg kg-1 with the highest values under natural vegetation. The estimation of forms of soil P with different lability (provided by NaHCO3 and NaOH extractions) showed little difference between natural vegetation and pastures, but the proportions of Po extracted suggest the importance of organically bound P as a source of plant-available P. All NMR spectra showed signals of organic P(monoesters and diesters) and inorganic P form(orthophosphate and phosphosphate), with little influence of land use. Organic P appears to be mainly in the form of stable phosphomonoesters. The most marked effect of land use was a decrease in PME activity under recent pastures, indicating na increase of PME stability in topsoils after the maize-grass ley plantation. The importance of the pH of the PME activity measurements is also discussed.
650 $apastures
650 $aphosphorus
650 $asoil
650 $asoil fertility
650 $aAnálise do Solo
650 $aCerrado
650 $aFertilidade do Solo
650 $aFósforo
650 $aPastagem
650 $aSolo
653 $aSoil testing
700 1 $aBROSSARD, M.
700 1 $aQUIQUAMPOIX, H.
773 $tCandian Journal of Soil Science, Ottawa-Canada$gv. 81, p. 591-601, 2001.
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 2 | |
| 2. |  | EBERHARDT, D.; MARCHAO, R. L.; QUIQUAMPOIX, H.; LE GUERNEVÉ, C.; RAMAROSON, V.; SAUVADET, M.; MURAOKA, T.; BECQUER, T. Effects of companion crops and tillage on soil phosphorus in a Brazilian oxisol: a chemical and 31P NMR spectroscopy study. Journal of Soils and Sediments, v. 21, p. 1024?1037, 2021.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 2 | |
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