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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
17/03/2005 |
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Data da última atualização: |
17/03/2005 |
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Autoria: |
LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; VILELA, L.; LIMA, S. do C.; ZECH, W. |
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Título: |
Chemical fractionation of phosphorus, sulphur, and molybdenum in Brazilian savannah oxisols under different land use. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 96, p. 31-46, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
In soils, P. S, and Mo occur organically bound or as oxyanions. In oxisols, oxyanions may be strongly sorbed due to the high positive surface charge. The objective of this work was to compare chemical fractions of P. S. and Mo in differently used Oxisols with similar properties in an on-farm experiment. Soil samples (0-0.15m) were taken from three replicate plots of each of conventional tillage (CT) and no-till (NT) maize-soybean and conventional tillage sugarcane (SC) cropping systems, degraded (DP) and productive pastures (PP), Eucalyptus (EU) and Pinus reforestations (PI), and native savannah (CE). The samples were sequentially extracted with (1) 0.5 M NaHCO3, (2) 0.1 M NaOH, (3) 1 M HCI, (4) hot concentrated HCl, and (5) concentrated HClO4/HNO3. In the extracts, inorganic (Pi) and total P, S, and Mo were determined. Organic P (Po) was calculated as total P-Pi. Total concentrations were 333-567 mg P kg (elevado a -1), 231-284 mg S kg (elevado a -1), and 3.2-3.9 mg Mo kg (elevado a -1). The most important fractions in all studied systems were the NaOH fraction for P (38-49% of total P), the HClO4/HNO3 fraction for S (27-35% of total S) and the concentrated HCl fraction for Mo (86-90% of total Mo). The proportion of the more easily extracted NaHCO3+NaOH fractions decreased along the line S>P>Mo. Fertilisation increased plant-availble P and S fractions in CT and NT whereas recalcitrant fraction (concentrated HCl and HClO4/HNO3) remained unchanged. The Pi/Po ratios in NT and CT were higher than CE because fertiliser P mainly accumulated in inorganic P fractions. The pasture soil had lower P concentrations indicating export by grazing. Thus, 12-20 years of land use had marked effects on P. smaller ones on S. and almost none on Mo concentrations and chemical fractions. MenosIn soils, P. S, and Mo occur organically bound or as oxyanions. In oxisols, oxyanions may be strongly sorbed due to the high positive surface charge. The objective of this work was to compare chemical fractions of P. S. and Mo in differently used Oxisols with similar properties in an on-farm experiment. Soil samples (0-0.15m) were taken from three replicate plots of each of conventional tillage (CT) and no-till (NT) maize-soybean and conventional tillage sugarcane (SC) cropping systems, degraded (DP) and productive pastures (PP), Eucalyptus (EU) and Pinus reforestations (PI), and native savannah (CE). The samples were sequentially extracted with (1) 0.5 M NaHCO3, (2) 0.1 M NaOH, (3) 1 M HCI, (4) hot concentrated HCl, and (5) concentrated HClO4/HNO3. In the extracts, inorganic (Pi) and total P, S, and Mo were determined. Organic P (Po) was calculated as total P-Pi. Total concentrations were 333-567 mg P kg (elevado a -1), 231-284 mg S kg (elevado a -1), and 3.2-3.9 mg Mo kg (elevado a -1). The most important fractions in all studied systems were the NaOH fraction for P (38-49% of total P), the HClO4/HNO3 fraction for S (27-35% of total S) and the concentrated HCl fraction for Mo (86-90% of total Mo). The proportion of the more easily extracted NaHCO3+NaOH fractions decreased along the line S>P>Mo. Fertilisation increased plant-availble P and S fractions in CT and NT whereas recalcitrant fraction (concentrated HCl and HClO4/HNO3) remained unchanged. The Pi/Po ratios in NT and ... Mostrar Tudo |
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Thesagro: |
Cerrado; Eucalipto; Reflorestamento. |
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Thesaurus Nal: |
Pinus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02429naa a2200229 a 4500
001 1568612
005 2005-03-17
008 2000 bl uuuu u00u1 u #d
100 1 $aLILIENFEIN, J.
245 $aChemical fractionation of phosphorus, sulphur, and molybdenum in Brazilian savannah oxisols under different land use.
260 $c2000
520 $aIn soils, P. S, and Mo occur organically bound or as oxyanions. In oxisols, oxyanions may be strongly sorbed due to the high positive surface charge. The objective of this work was to compare chemical fractions of P. S. and Mo in differently used Oxisols with similar properties in an on-farm experiment. Soil samples (0-0.15m) were taken from three replicate plots of each of conventional tillage (CT) and no-till (NT) maize-soybean and conventional tillage sugarcane (SC) cropping systems, degraded (DP) and productive pastures (PP), Eucalyptus (EU) and Pinus reforestations (PI), and native savannah (CE). The samples were sequentially extracted with (1) 0.5 M NaHCO3, (2) 0.1 M NaOH, (3) 1 M HCI, (4) hot concentrated HCl, and (5) concentrated HClO4/HNO3. In the extracts, inorganic (Pi) and total P, S, and Mo were determined. Organic P (Po) was calculated as total P-Pi. Total concentrations were 333-567 mg P kg (elevado a -1), 231-284 mg S kg (elevado a -1), and 3.2-3.9 mg Mo kg (elevado a -1). The most important fractions in all studied systems were the NaOH fraction for P (38-49% of total P), the HClO4/HNO3 fraction for S (27-35% of total S) and the concentrated HCl fraction for Mo (86-90% of total Mo). The proportion of the more easily extracted NaHCO3+NaOH fractions decreased along the line S>P>Mo. Fertilisation increased plant-availble P and S fractions in CT and NT whereas recalcitrant fraction (concentrated HCl and HClO4/HNO3) remained unchanged. The Pi/Po ratios in NT and CT were higher than CE because fertiliser P mainly accumulated in inorganic P fractions. The pasture soil had lower P concentrations indicating export by grazing. Thus, 12-20 years of land use had marked effects on P. smaller ones on S. and almost none on Mo concentrations and chemical fractions.
650 $aPinus
650 $aCerrado
650 $aEucalipto
650 $aReflorestamento
700 1 $aWILCKE, W.
700 1 $aAYARZA, M. A.
700 1 $aVILELA, L.
700 1 $aLIMA, S. do C.
700 1 $aZECH, W.
773 $tGeoderma, Amsterdam$gv. 96, p. 31-46, 2000.
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 86 | |
| 43. |  | LEHMANN, J.; SCHROTH, G.; TEIXEIRA, W.; WOLFGANG ZECH, W.; CRAVO, M. da S. Nutrient and water dynamics in a multi-strata agroforestry system. In: CONGRESSO BRASILEIRO EM SISTEMAS AGROFLORESTAIS, 2., 1998, Belém, PA. Sistemas agroflorestais no contexto da qualidade ambiental e competitividade: resumos expandidos. Belém, PA: Embrapa-CPATU, 1998. p. 38-41.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 44. | | LILIENFEIN, J.; WILCKE, W.; NEUFELDT, M.; AYARZA, M. A.; ZECH, W. Land-use effects on organic carbon, nitrogen, and sulphur concentrations in macroaggregates of differently textured Brazilian oxisols. Journal of Plant Nutrition and Soil Science, Berlin, v.161, n.2, p.165-171, 1998.| Biblioteca(s): Embrapa Cerrados. |
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| 46. | | TEIXEIRA, W. G.; SCHROTH, G.; MARQUES, J. D.; CRAVO, M. D. S.; HUWE, B.; ZECH, W. Indicators for the sustainability of land use systems on degraded areas of the Terra Firme in the Amazon Basin: soil characteristics and parameters for transport processes. In: INTERNATIONAL SOIL CONSERVATION ORGANIZATION CONFERENCE, 10., 1999, West Lafayette. Abstracts... West Lafayette: [s.n.], 1999.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 54. | | LILIENFEIN, J.; WILCKE, W.; VILELA, L.; LIMA, S. do C.; THOMAS, R.; ZECH, W. Effect of no-tillage and conventional tillage systems on the chemical composition of soil solid phase and soil solution of brazilian savanna oxisols. Journal of Plant Nutrition and Soil Science, Berlin, v. 163, p. 411-419, 2000.| Biblioteca(s): Embrapa Cerrados. |
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| 55. | | DINKELMEYER, H.; LEHMANN, J.; KAISER, K.; TEIXEIRA, W. G.; RENCK, A.; ZECH, W. Fate of applied N fertilizer in mixed cropping systems in the central Amazon. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 3., 2000, Manaus. Sistemas agroflorestais: manejando a biodiversidade e compondo a paisagem rural - resumos expandidos. Manaus: Embrapa Amazonia Ocidental, 2000. p. 196-197.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 59. | | RENZ, T. E.; NEUFELDT, H.; AYARZA, M. A.; RESCK, D. V. S.; ZECH, W. Microbial biomass, microbial activity, and carbon pools under different land-use systems in the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.187-197.| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 86 | |
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