Sustainable land use in periodically dry Brazilian savannas requires a water-saving management. We hypothesized that the annual course of matric potentials (?M) in very-fine, isohyperthermic Anionic Acrustoxes of Pinus plantations (PI), degraded (DP) and productive pastures (PP), no-till (NT) and...
Lilienfein, J
,
Wilcke, W.
,
Ayarza, Miguel Angel
,
Lima, SC
,
Vilela, L
,
Zech, W.
,
[Annual course of matric potential in differently used savanna oxisols in Brazil]
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Annual course of matric potential in differently used savanna oxisols in Brazil
Moller, A.
,
Kaiser, K.
,
Wilcke, W.
,
Maglinao, Amado R.
,
Kanchanakool, N.
,
Jirasuktaveekul, W.
,
Zech, W.
,
[Organically bound nutrients in soils of small water catchments under different forest and agroecosystems in Northern Thailand]
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Organically bound nutrients in soils of small water catchments under different forest and agroecosystems in Northern Thailand
In the Brazilian savanna, there is a risk that soil fertility of pastures declines to a level below that of the native savanna because of low fertilizer application. To evaluate biophysical pasture sustainability we compared regularly fertilized productive pasture (PP), degraded pasture fertilize...
Lilienfein, J
,
Wilcke, W.
,
Vilela, L
,
Ayarza, Miguel Angel
,
Carmo Lima, S. do
,
Zech, W.
,
[Soil fertility under native cerrado and pasture in the Brazilian savanna]
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Soil fertility under native cerrado and pasture in the Brazilian savanna
Guggenberger, G
,
Haumaier, L
,
Thomas, 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]
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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
The effect of land use on the availability of soil nitrogen (N) was studied by separating total soil N into one labile and one stable fraction by oxidation and extraction of labile N with potassium permanganate. The nitrogen management index (NMI) was calculated according to Blair et al. (1995) f...
Westerhof, R
,
Vilela, L
,
Ayarza, Miguel Angel
,
Zech, W.
,
[Labile N and the nitrogen management index of oxisols in the Brazilian cerrados]
,
Labile N and the nitrogen management index of oxisols in the Brazilian cerrados
Intensive farming and grazing on Oxisols of the Brazilian savannas (also known as the Cerrados) are leading to loss of soil organic matter (SOM) and consequently to a decline in fertility and sustainability of the soils. Alternative land-use systems such as the introduction of legumes in pastures...
Fuhrmann, S
,
Neudelft, H
,
Westerhof, R
,
Ayarza, Miguel Angel
,
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]
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Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of the Brazilian cerrados
In the Cerrados, a large savanna region in Brazil, the effects of different land use on aggregation in Oxisols were studied, using laser diffraction grain-size analyses. The topsoil of plowed systems had significantly fewer macroaggregates (194-2000 micro m) and a significantly larger fraction of...
Westerhof, R
,
Buurman, P
,
Griethuysen, C. van
,
Ayarza, Miguel Angel
,
Vilela, L
,
Zech, W.
,
[Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados]
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Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados
The permanganate oxidation procedure is easily performed and may help monitor large areas for their soil organic matter (SOM) quality and nitrogen (N) availability. Knowledge of the chemical characteristics of fractions that are lost or remain after oxidation will help explain results obtained by...
Westerhof, R
,
Vilela, L
,
Ayarza, Miguel Angel
,
Zech, W.
,
[Characterization labile and stable nitrogen]
,
Characterization labile and stable nitrogen
In the Brazilian savannas, or Cerrados the rapid advance in agriculture and cattle ranching is affecting soils through, for example, accelerated erosion and depletion of soil organic matter (SOM). Changes in soil microbial biomass are good indicators of changes in SOM. We therefore assessed the e...
Renz, TE
,
Neufeldt, Henry
,
Ayarza, Miguel Angel
,
Resck, DVS
,
Zech, W.
,
[Microbial biomass, microbial activity, and carbon pools under different land-use systems in the Brazilian cerrados]
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Microbial biomass, microbial activity, and carbon pools under different land-use systems in the Brazilian cerrados
Short-term changes in soil aggregation, total and particulate organic C and N were studied in cropping and pasture systems of the Brazilian savannas, also known as the Cerrados. Furthermore, the concepts of a hierarchical aggregate structure and of the interaction of soil structure with particula...
Freibauer, A.
,
Westerhof, R
,
Ayarza, Miguel Angel
,
Silva, J.E. da
,
Zech, W.
,
[Short-term variation in aggregation and particulate organic matter under crops and pastures]
,
Short-term variation in aggregation and particulate organic matter under crops and pastures