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Journal Article 1999

Autor: Lilienfein, J Wilcke, W. Ayarza, Miguel Angel Lima, SC Vilela, L Zech, W.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/43185

Investigación en Agricultura
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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] ,  Annual course of matric potential in differently used savanna oxisols in Brazil
Book Chapter 1999

Autor: Westerhof, R Vilela, L Ayarza, Miguel Angel Zech, W.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/55133

Investigación en Agricultura
Enlace permanente
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
Book Chapter 1999

Autor: Westerhof, R Buurman, P Griethuysen, C. van Ayarza, Miguel Angel Vilela, L Zech, W.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/55128

Investigación en Agricultura
Enlace permanente
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] ,  Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados
Book Chapter 1999

Autor: Westerhof, R Vilela, L Ayarza, Miguel Angel Zech, W.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/55134

Investigación en Agricultura
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Westerhof, R ,  Vilela, L ,  Ayarza, Miguel Angel ,  Zech, W. ,  [Characterization labile and stable nitrogen] ,  Characterization labile and stable nitrogen
Book Chapter 1999

Autor: Westerhof, R Vilela, L Ayarza, Miguel Angel Zech, W.

Soil organic matter quality is usually seen as a major attribute of soil quality. In this study, we extracted organic carbon with water (WEOC) or with potassium permanganate (PEOC). We assessed these extractions for their potential as sensitive indicators of the effect of land use on two importan...

Enlace original: https://cgspace.cgiar.org/handle/10568/55132

Investigación en Agricultura
Enlace permanente
Westerhof, R ,  Vilela, L ,  Ayarza, Miguel Angel ,  Zech, W. ,  [Carbon fractions as sensitive indicators of quality of soil organic matter] ,  Carbon fractions as sensitive indicators of quality of soil organic matter
Journal Article 1998

Autor: Westerhof, R Vilela, L Ayarza, Miguel Angel Zech, W.

The effect of land use on the availability of nitrogen (N) was studied by separating total N into a labile and a stable fraction by oxidation and extraction of labile N with KMnO4. The nitrogen management index (NMI) was calculated following the method of Blair et al. (1995) for the carbon manage...

Enlace original: https://cgspace.cgiar.org/handle/10568/43628

Investigación en Agricultura
Enlace permanente
Westerhof, R ,  Vilela, L ,  Ayarza, Miguel Angel ,  Zech, W. ,  [Land use effects on labile N extracted with permanganate and the nitrogen management index in the Cerrado region of Brazil] ,  Land use effects on labile N extracted with permanganate and the nitrogen management index in the Cerrado region of Brazil

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