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Book Chapter 2007

Autor: Ayarza, Miguel Angel Amézquita Collazos, Edgar Rao, Idupulapati M. Barrios, Edmundo Rondón, Marco Antonio Rubiano Sanabria, Yolanda Quintero, Marcela
Enlace original: https://cgspace.cgiar.org/handle/10568/77837

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Ayarza, Miguel Angel ,  Amézquita Collazos, Edgar ,  Rao, Idupulapati M. ,  Barrios, Edmundo ,  Rondón, Marco Antonio ,  Rubiano Sanabria, Yolanda ,  Quintero, Marcela ,  [Advances in improving agricultural profitability and overcoming land degradation in savanna and hillside agroecosystems of tropical America] ,  Advances in improving agricultural profitability and overcoming land degradation in savanna and hillside agroecosystems of tropical America
Book Chapter 2003

Autor: Amede, Tilahun Amézquita Collazos, Edgar Ashby, J.A. Ayarza, Miguel Angel Barrios, Edmundo Bationo, B. André Beebe, Stephen E. Bellotti, Anthony C. Blair, Matthew W. Delve, Robert J. Fujisaka, Sam Howeler, Reinhardt H. Johnson, Nancy L. Kaaria, Susan K. Kelemu, Segenet Kerridge, Peter C. Kirkby, Roger A. Lascano, Carlos E. Lefroy, R.D.B. Mahuku, George S. Murwira, Herbert K. Oberthür, Thomas Pachico, Douglas H. Peters, Michael Ramisch, Joshua J. Rao, Idupulapati M. Rondón, Marco Antonio Sanginga, Pascal C. Swift, M. Vanlauwe, Bernard

This paper describes the importance of biological nitrogen fixation (BNF) by legumeRhizobium symbiosis to tropical agriculture, the evolution of BNF paradigms, creation of strategic alliances to combat soil fertility degradation, and accomplishments of collaborative BNF-related research at CIAT-T...

Enlace original: https://cgspace.cgiar.org/handle/10568/77819

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Amede, Tilahun ,  Amézquita Collazos, Edgar ,  Ashby, J.A. ,  Ayarza, Miguel Angel ,  Barrios, Edmundo ,  Bationo, B. André ,  Beebe, Stephen E. ,  Bellotti, Anthony C. ,  Blair, Matthew W. ,  Delve, Robert J. ,  Fujisaka, Sam ,  Howeler, Reinhardt H. ,  Johnson, Nancy L. ,  Kaaria, Susan K. ,  Kelemu, Segenet ,  Kerridge, Peter C. ,  Kirkby, Roger A. ,  Lascano, Carlos E. ,  Lefroy, R.D.B. ,  Mahuku, George S. ,  Murwira, Herbert K. ,  Oberthür, Thomas ,  Pachico, Douglas H. ,  Peters, Michael ,  Ramisch, Joshua J. ,  Rao, Idupulapati M. ,  Rondón, Marco Antonio ,  Sanginga, Pascal C. ,  Swift, M. ,  Vanlauwe, Bernard ,  [Biological nitrogen fixation: A key input to integrated soil fertility management in the tropics] ,  Biological nitrogen fixation: A key input to integrated soil fertility management in the tropics
Book Chapter 2012-05-25

Autor: Peters, Michael Rao, Idupulapati M. Fisher, M. Subbaraoa, Guntur V. Martens, S. Herrero, Mario T. Hoek, Rein van der Schultze-Kraft, Rainer Miles, John W. Castro, A. Graefe, S. Tiemann, Tassilo T. Ayarza, Miguel Angel Hyman, Glenn

Agriculture and livestock production are major contributors to greenhouse gas emissions. Foragebased systems dominate much of agriculture in the tropics, providing livelihoods to farmers but also affecting local and global environments. In this paper, we attempt to answer the question, how can fa...

Enlace original: https://cgspace.cgiar.org/handle/10568/17234

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Peters, Michael ,  Rao, Idupulapati M. ,  Fisher, M. ,  Subbaraoa, Guntur V. ,  Martens, S. ,  Herrero, Mario T. ,  Hoek, Rein van der ,  Schultze-Kraft, Rainer ,  Miles, John W. ,  Castro, A. ,  Graefe, S. ,  Tiemann, Tassilo T. ,  Ayarza, Miguel Angel ,  Hyman, Glenn ,  [Tropical forage-based systems to mitigate greenhouse gas emissions] ,  Tropical forage-based systems to mitigate greenhouse gas emissions
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

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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: Fuhrmann, S Neudelft, H Westerhof, R Ayarza, Miguel Angel Silva, J.E. da Zech, W.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/55131

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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] ,  Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of 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

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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

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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: Friesen, Dennis K. Ayarza, Miguel Angel Thomas, Richard J. Amézquita Collazos, Edgar Sanz Scovino, José Ignacio
Enlace original: https://cgspace.cgiar.org/handle/10568/55116

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Friesen, Dennis K. ,  Ayarza, Miguel Angel ,  Thomas, Richard J. ,  Amézquita Collazos, Edgar ,  Sanz Scovino, José Ignacio ,  [Strategic systems research for the Latin American savannas] ,  Strategic systems research for the Latin American savannas
Book Chapter 1999

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

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/55138

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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] ,  Microbial biomass, microbial activity, and carbon pools under different land-use systems in the Brazilian cerrados

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