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18. | | BENITO, N. P.; SOARES, R. dos S.; CAMARGO, A. J. A. de; BROSSARD, M. Criação de colônias de cupins de montículo em casa de vegetação. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 22., 2008, Uberlândia. Ciência, tecnologia e inovação: anais. Viçosa, MG: UFV, 2008. 1 CD- ROM. Biblioteca(s): Embrapa Cerrados. |
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19. | | BALBINO, L. C.; BRUAND, A.; BROSSARD, M.; GRIMALDI, M.; HAJNOS, M.; GUIMARAES, M. F. Changes in porosity and microaggregation in clayey Ferralsols of the Brazilian Cerrado on clearing for pasture. European Journal of Soil Science, v. 53, n. 2, p. 219-230, June 2002. Biblioteca(s): Embrapa Arroz e Feijão. |
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Registros recuperados : 71 | |
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Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
22/07/2002 |
Data da última atualização: |
22/07/2002 |
Autoria: |
CHAPUIS-LARDY, L.; BROSSARD, M.; QUIQUAMPOIX, H. |
Título: |
Assessing organic phosphorus status of Cerrado oxisols (Brazil) using P-NMR spectroscopy and phosphomonoesterase activity measurement. |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Candian Journal of Soil Science, Ottawa-Canada, v. 81, p. 591-601, 2001. |
Idioma: |
Inglês |
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.
|
Palavras-Chave: |
Soil testing. |
Thesagro: |
Análise do Solo; Cerrado; Fertilidade do Solo; Fósforo; Pastagem; Solo. |
Thesaurus NAL: |
pastures; phosphorus; soil; soil fertility. |
Categoria do assunto: |
-- |
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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