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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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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
24/01/2023 |
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Data da última atualização: |
22/08/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
AGUIAR JÚNIOR, A. L. de; OLIVEIRA NETO, S. N. de; MULLER, M. D.; SOARES, C. P. B.; PENA, R. F.; CALSAVARA, L. H. F. |
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Afiliação: |
ADÊNIO LOUZEIRO DE AGUIAR JÚNIOR, Prefeitura de Belo Horizonte; SILVIO NOLASCO DE OLIVEIRA NETO, Universidade Federal de Viçosa; MARCELO DIAS MULLER, CNPGL; CARLOS PEDRO BOECHAT SOARES, Universidade Federal de Viçosa; RICARDO FERNANDES PENA; LEONARDO HENRIQUE FERREIRA CALSAVARA, Emater-MG. |
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Título: |
Eucalypt modeling as a function of spatial arrangement in agrosilvopastoral systems. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Agroforestry Systems, v. 97, p. 495-508, 2023. |
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DOI: |
https://doi.org/10.1007/s10457-023-00805-7 |
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Idioma: |
Inglês |
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Conteúdo: |
The objective of this study was to evaluate height-diameter, volumetric, and taper models to estimate tree height and volume to describe the bole profles of a eucalypts clone established in three agrosilvopastoral spatial arrangements (18×2.5; 5×2+40; 3 (3×2)+30) in Coronel Xavier Chaves, Minas Gerais state, Brazil. The diameter at breast height, total height, and diameter outside bark along the stems of the sample trees were collected. Height-diameter, volume, and taper models were ft to the observed data for each spatial arrangement and were compared to select the best alternative. The mean annual increment for single, double, and triple lines at 48, 60, and 72 months of age, respectively, ranged from 26.0 to 34.6 m3 ha?1 year?1, as well as individual volume ranged from 0.41 to 0.53 m3 tree?1. The heightdiameter curves showed a distinct tendency for each spatial arrangement and can be represented by diferent equations. The equations to estimate volume and taper ft well to the data, and the Spurr and Garay models were selected as the best ftting, respectively. In addition, Graybill's F-test (Theory and application of the linear model. Duxbury Press, Massachussetts, 1976) showed that a single equation could ft the Spurr and Garay models for all spatial arrangements. |
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Palavras-Chave: |
ILPF; Integração lavoura-pecuária-floresta; Sistema agrossilvipastoril. |
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Thesagro: |
Eucalipto; Sistema de Cultivo. |
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Categoria do assunto: |
A Sistemas de Cultivo |
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Marc: |
LEADER 02089naa a2200253 a 4500
001 2151179
005 2023-08-22
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s10457-023-00805-7$2DOI
100 1 $aAGUIAR JÚNIOR, A. L. de
245 $aEucalypt modeling as a function of spatial arrangement in agrosilvopastoral systems.$h[electronic resource]
260 $c2023
520 $aThe objective of this study was to evaluate height-diameter, volumetric, and taper models to estimate tree height and volume to describe the bole profles of a eucalypts clone established in three agrosilvopastoral spatial arrangements (18×2.5; 5×2+40; 3 (3×2)+30) in Coronel Xavier Chaves, Minas Gerais state, Brazil. The diameter at breast height, total height, and diameter outside bark along the stems of the sample trees were collected. Height-diameter, volume, and taper models were ft to the observed data for each spatial arrangement and were compared to select the best alternative. The mean annual increment for single, double, and triple lines at 48, 60, and 72 months of age, respectively, ranged from 26.0 to 34.6 m3 ha?1 year?1, as well as individual volume ranged from 0.41 to 0.53 m3 tree?1. The heightdiameter curves showed a distinct tendency for each spatial arrangement and can be represented by diferent equations. The equations to estimate volume and taper ft well to the data, and the Spurr and Garay models were selected as the best ftting, respectively. In addition, Graybill's F-test (Theory and application of the linear model. Duxbury Press, Massachussetts, 1976) showed that a single equation could ft the Spurr and Garay models for all spatial arrangements.
650 $aEucalipto
650 $aSistema de Cultivo
653 $aILPF
653 $aIntegração lavoura-pecuária-floresta
653 $aSistema agrossilvipastoril
700 1 $aOLIVEIRA NETO, S. N. de
700 1 $aMULLER, M. D.
700 1 $aSOARES, C. P. B.
700 1 $aPENA, R. F.
700 1 $aCALSAVARA, L. H. F.
773 $tAgroforestry Systems$gv. 97, p. 495-508, 2023.
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