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| 45. |  | 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.| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 46. | | LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; LIMA, S. do C.; VILELA, L.; ZECH, W. Annual course of matric potential in differently used savanna oxisols in Brazil. Soil Society of American Journal, Madison, v.63, p.1778-1785, 1999.| Biblioteca(s): Embrapa Cerrados. |
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| 48. | | 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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| 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.| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 60. | | FUHRMANN, S.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; ZECH, W. Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of 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.110-122.| Biblioteca(s): Embrapa Cerrados. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
03/05/2001 |
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Data da última atualização: |
03/05/2001 |
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Autoria: |
NEUFELDT, H.; SILVA, J. E. da; AYARZA, M. A.; ZECH, W. |
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Título: |
Land-use effects on phosphorus fractions in Cerrado oxisols. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Biology and Fertility of Soils, Heidelberger, v.31, p.30-37, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Differently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only incresead levels of inorganic P (Pi) forms, the increase being mot acentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particlesize fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69-87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also na effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction. |
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Thesagro: |
Cerrado; Fósforo; Fracionamento; Oxisol; Uso da Terra. |
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Thesaurus NAL: |
Ferralsols; fractionation; land use; phosphorus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02166naa a2200265 a 4500
001 1546797
005 2001-05-03
008 2000 bl --- 0-- u #d
100 1 $aNEUFELDT, H.
245 $aLand-use effects on phosphorus fractions in Cerrado oxisols.
260 $c2000
520 $aDifferently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only incresead levels of inorganic P (Pi) forms, the increase being mot acentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particlesize fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69-87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also na effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction.
650 $aFerralsols
650 $afractionation
650 $aland use
650 $aphosphorus
650 $aCerrado
650 $aFósforo
650 $aFracionamento
650 $aOxisol
650 $aUso da Terra
700 1 $aSILVA, J. E. da
700 1 $aAYARZA, M. A.
700 1 $aZECH, W.
773 $tBiology and Fertility of Soils, Heidelberger$gv.31, p.30-37, 2000.
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