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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
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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
Book Chapter 1999

Autor: Neufeldt, Henry Resck, DVS Ayarza, Miguel Angel Zech, W.

Little is known about the sustainability of cultivation systems in the Brazilian savannas, also known as the Cerrados, despite its increasing significance for that country`s agriculture. To characterize management effects and follow alterations of organic compounds in different fractions, we stud...

Enlace original: https://cgspace.cgiar.org/handle/10568/55130

Investigación en Agricultura
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Neufeldt, Henry ,  Resck, DVS ,  Ayarza, Miguel Angel ,  Zech, W. ,  [Soil organic matter in oxisols of the Brazilian cerrados] ,  Soil organic matter in oxisols of the Brazilian cerrados
Book Chapter 2001

Autor: Jiménez Jaén, J.J. Decaëns, Thibaud Thomas, Richard J. Lavelle, Patrick M.
Enlace original: https://cgspace.cgiar.org/handle/10568/55166

Investigación en Agricultura
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Jiménez Jaén, J.J. ,  Decaëns, Thibaud ,  Thomas, Richard J. ,  Lavelle, Patrick M. ,  [Soil macrofauna: an available but little-known natural resources] ,  Soil macrofauna: an available but little-known natural resources
Book Chapter 2001

Autor: Decaëns, Thibaud Galvis, JH Amézquita Collazos, Edgar

Fourteen types of physical structures produced on the soil surface by ecological engineers were sampled in the Eastern Plains of Colombia. The invertebrates creating these structures were identified. Some physical (aggregate size and stability, and bulk density) and chemical (C, N, and P contents...

Enlace original: https://cgspace.cgiar.org/handle/10568/55176

Investigación en Agricultura
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Decaëns, Thibaud ,  Galvis, JH ,  Amézquita Collazos, Edgar ,  [Properties of the structures created by ecosystem engineers on the soil surface of a Colombian savanna] ,  Properties of the structures created by ecosystem engineers on the soil surface of a Colombian savanna
Conference Paper 1997

Autor: Friesen, Dennis K. Rao, Idupulapati M. Thomas, Richard J. Oberson, Astrid Sanz Scovino, José Ignacio
Enlace original: https://cgspace.cgiar.org/handle/10568/77824

Investigación en Agricultura
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Friesen, Dennis K. ,  Rao, Idupulapati M. ,  Thomas, Richard J. ,  Oberson, Astrid ,  Sanz Scovino, José Ignacio ,  [Phosphorus acquisition and cycling in crop and pasture systems in low fertility tropical soils] ,  Phosphorus acquisition and cycling in crop and pasture systems in low fertility tropical soils
Book Chapter 2004

Autor: Singh, Bal Ram Rao, Idupulapati M. Barrios, Edmundo Amézquita Collazos, Edgar
Enlace original: https://cgspace.cgiar.org/handle/10568/77839

Investigación en Agricultura
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Singh, Bal Ram ,  Rao, Idupulapati M. ,  Barrios, Edmundo ,  Amézquita Collazos, Edgar ,  [Potential of tillage, agropastoral, and planted fallow systems in low-fertility tropical soils in Latin America] ,  Potential of tillage, agropastoral, and planted fallow systems in low-fertility tropical soils in Latin America
Journal Article 2006

Autor: Basamba, T.A. Barrios, E. Amézquita Collazos, Edgar Rao, Idupulapati M. Singh, B.R.

Soil organic matter (SOM) and phosphorus (P) fractions play a key role in sustaining the productivity of acid-savanna oxisols and are greatly influenced by tillage practices. In 1993, a long-term experiment on sustainable crop rotation and ley farming systems was initiated on a Colombian acid-sav...

Enlace original: https://cgspace.cgiar.org/handle/10568/44189

Investigación en Agricultura
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Basamba, T.A. ,  Barrios, E. ,  Amézquita Collazos, Edgar ,  Rao, Idupulapati M. ,  Singh, B.R. ,  [Tillage effects on maize yield in a Colombian savanna oxisol : Soil organic matter and P fractions] ,  Tillage effects on maize yield in a Colombian savanna oxisol : Soil organic matter and P fractions
Journal Article 2005

Autor: Velásquez, E. Lavelle, Patrick M. Barrios, E. Joffre, R Reversat, F

Near infrared reflectance spectroscopy (NIRS) analysis was used to discriminate soils of different agroecosystems in Colombia, with different contents and qualities of organic matter, chemical, and biological properties. Correlations were sought between absorbance in wavelength classes as determ...

Enlace original: https://cgspace.cgiar.org/handle/10568/43423

Investigación en Agricultura
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Velásquez, E. ,  Lavelle, Patrick M. ,  Barrios, E. ,  Joffre, R ,  Reversat, F ,  [Evaluating soil quality in tropical agroecosystems of Colombia using NIRS] ,  Evaluating soil quality in tropical agroecosystems of Colombia using NIRS
Journal Article 2009

Autor: Fonte, Steven J. Yeboah, E. Ofori, P Quansah, GW Vanlauwe, Bernard Six, Johan

This study examined the influence of organic residue quality and N fertilizer on aggregate-associated SOM in maize cropping systems of southern Ghana. Six residue treatments of differing quality (Crotalaria juncea, Leucaena leucocephala, maize stover, sawdust, cattle manure and a control with ...

Enlace original: https://cgspace.cgiar.org/handle/10568/43457

Investigación en Agricultura
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Fonte, Steven J. ,  Yeboah, E. ,  Ofori, P ,  Quansah, GW ,  Vanlauwe, Bernard ,  Six, Johan ,  [Fertilizer and residue quality effects on organic matter stabilization in soil aggregates] ,  Fertilizer and residue quality effects on organic matter stabilization in soil aggregates
Journal Article 2005

Autor: Vanlauwe, Bernard Gachengo, CN Shepherd, Keith D. Barrios, E. Cadisch, Georg Palm, C.A.

Organic resources (ORs) are essential inputs in tropical farming systems and their decomposition dynamics are related to their quality. A Decision Support System (DSS) for organic N management has been proposed earlier that subdivides ORs in four classes depending on their N, lignin, and soluble ...

Enlace original: https://cgspace.cgiar.org/handle/10568/43627

Investigación en Agricultura
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Vanlauwe, Bernard ,  Gachengo, CN ,  Shepherd, Keith D. ,  Barrios, E. ,  Cadisch, Georg ,  Palm, C.A. ,  [Laboratory validation of a resource quality-based conceptual framework for organic matter management] ,  Laboratory validation of a resource quality-based conceptual framework for organic matter management

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