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Guggenberger, GHaumaier, LThomas, Richard J.Zech, W.[Determinación, mediante la espectroscopìa de RMN con 31P, del nivel de fósforo orgánico de un oxisol, en pastizales del trópico derivados de la sabana nativa]Determinación, mediante la espectroscopìa de RMN con 31P, del nivel de fósforo orgánico de un oxisol, en pastizales del trópico derivados de la sabana nativa

This study assessed the influence of land use (continuous cropping, CC; tree plantations, F; pasture, PG; and native savanna, NS) on P concentrations and partitioning in bulk soil and two aggregate size fractions of two Oxisols, one loamy and one clayey. The quantity and quality of physically pro...


Lilienfein, JWilcke, W.Neufeldt, HenryAyarza, Miguel AngelZech, W.[Phosphorus pools in bulk soil and aggregates of differently textured oxisols under different land-use systems in the Brazilian cerrados]Phosphorus pools in bulk soil and aggregates of differently textured oxisols under different land-use systems in the Brazilian cerrados

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 compare...


Neufeldt, HenrySilva, J.E. daAyarza, Miguel AngelZech, W.[Land-use effects on phosphorus fractions in cerrado oxisols]Land-use effects on phosphorus fractions in cerrado oxisols

Plant production in the Brazilian savannas, also known as the Cerrados, is limited mainly by low P availability. In tropical soils, rich in sesquioxides, P supply of plants depends heavily on the transformation of organic P by phosphatase enzymes into HPO 4 2- and H 2 PO 4-. We examined two Oxiso...


Renz, TENeufeldt, HenryAyarza, Miguel AngelSilva, J.E. daZech, W.[Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados]Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados

We examined whole-soil samples and particle-size fractions to study the distribution of different phosphorus (P) fractions after land-use change from native savanna to crops, pasture, and reforestation on clayey and loamy Oxisols of the Brazilian savannas. Phosphorus was extracted sequentially, a...


Westerhof, RSilva, J.E. daAyarza, Miguel AngelZech, W.[Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados]Phosphorus fractions under different land-use systems in oxisols of the Brazilian cerrados

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