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Se han encontrado 30 recursos

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Journal Article 2008

Autor: Tittonell, Pablo A. Shepherd, Keith D. Vanlauwe, Bernard Giller, Ken E.

To guide soil fertility investment programmes in sub-Saharan Africa, better understanding is needed of the relative importance of soil and crop management factors in determining smallholder crop yields and yield variability. Spatial variability in crop yields within farms is strongly influenced b...

Enlace original: https://cgspace.cgiar.org/handle/10568/44205

Investigación en Agricultura
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Tittonell, Pablo A. ,  Shepherd, Keith D. ,  Vanlauwe, Bernard ,  Giller, Ken E. ,  [Unravelling the effects of soil and crop management on maize productivity in smallholder agricultural systems of western Kenya : An application of classification and regression tree analysis] ,  Unravelling the effects of soil and crop management on maize productivity in smallholder agricultural systems of western Kenya : An application of classification and regression tree analysis
Journal Article 2011

Autor: Verchot, Louis V. Dutaur, L. Shepherd, Keith D. Albrecht, A.

We studied the biochemical and biophysical processes of carbon sequestration in an intensive agroforestry system on two soils (Feralsol – Luero; Arenosol – Teso) in W. Kenya to elucidate the mechanisms associated with long-term carbon storage. Specifically, we looked at a top-down model (macro-ag...

Enlace original: https://cgspace.cgiar.org/handle/10568/20688

Investigación en Agricultura
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Verchot, Louis V. ,  Dutaur, L. ,  Shepherd, Keith D. ,  Albrecht, A. ,  [Organic matter stabilization in soil aggregates: understanding the biogeochemical mechanisms that determine the fate of carbon inputs in soils] ,  Organic matter stabilization in soil aggregates: understanding the biogeochemical mechanisms that determine the fate of carbon inputs in soils
Journal Article 2005

Autor: Tittonell, Pablo A. Vanlauwe, Bernard Leffelaar, P.A. Shepherd, Keith D. Giller, Ken E.

Strong gradients of decreasing soil fertility are found with increasing distance from the homestead within smallholder African farms, due to differential resource allocation. As nutrient use efficiency varies strongly along these gradients, such heterogeneity must be considered when designing soi...

Enlace original: https://cgspace.cgiar.org/handle/10568/42841

Investigación en Agricultura
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Tittonell, Pablo A. ,  Vanlauwe, Bernard ,  Leffelaar, P.A. ,  Shepherd, Keith D. ,  Giller, Ken E. ,  [Exploring diversity in soil fertility management of smallholder farms in western Kenya. II. Within-farm variability in resource allocation, nutrient flows and soil fertility status] ,  Exploring diversity in soil fertility management of smallholder farms in western Kenya. II. Within-farm variability in resource allocation, nutrient flows and soil fertility status
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
Journal Article 2017

Autor: Aynekulu, Ermias Mekuria, Wolde M. Tsegaye, D. Feyissa, K. Angassa, A. Leeuw, Jan de Shepherd, Keith D.

Controlled grazing management is considered as an effective strategy to enhance soil carbon sequestration, but empirical evidences are scarce. Particularly, the role of livestock exclusion related to soil carbon sequestration is not well understood in arid and semiarid savannas of Africa. We inve...

Enlace original: https://cgspace.cgiar.org/handle/10568/91543

Investigación en Agricultura
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Aynekulu, Ermias ,  Mekuria, Wolde M. ,  Tsegaye, D. ,  Feyissa, K. ,  Angassa, A. ,  Leeuw, Jan de ,  Shepherd, Keith D. ,  [Long-term livestock exclosure did not affect soil carbon in southern Ethiopian rangelands] ,  Long-term livestock exclosure did not affect soil carbon in southern Ethiopian rangelands
Journal Article 2018

Autor: Whitney, C.W. Lanzanova, D. Muchiri, C. Shepherd, Keith D. Rosenstock, Todd S. Krawinkel, M. Tabuti, J. R. S. Luedeling, Eike

Governments around the world have agreed to end hunger and food insecurity and to improve global nutrition, largely through changes to agriculture and food systems. However, they are faced with a lot of uncertainty when making policy decisions, since any agricultural changes will influence social...

Enlace original: https://cgspace.cgiar.org/handle/10568/91685

Investigación en Agricultura
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Whitney, C.W. ,  Lanzanova, D. ,  Muchiri, C. ,  Shepherd, Keith D. ,  Rosenstock, Todd S. ,  Krawinkel, M. ,  Tabuti, J. R. S. ,  Luedeling, Eike ,  [Probabilistic Decision Tools for Determining Impacts of Agricultural Development Policy on Household Nutrition] ,  Probabilistic Decision Tools for Determining Impacts of Agricultural Development Policy on Household Nutrition
Journal Article 2015

Autor: Shepherd, Keith D. Shepherd, G. Walsh, Markus G

Degradation of land health – the capacity of land, relative to its potential, to sustain delivery of ecosystem services – is recognized as a major global problem in general terms, but remains poorly quantified, resulting in a lack of specific evidence to focus action. Land health surveillance and...

Enlace original: https://cgspace.cgiar.org/handle/10568/66307

Investigación en Agricultura
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Shepherd, Keith D. ,  Shepherd, G. ,  Walsh, Markus G ,  [Land health surveillance and response: a framework for evidence-informed land management.] ,  Land health surveillance and response: a framework for evidence-informed land management.
Journal Article 2013

Autor: Towett, Erick K. Shepherd, Keith D. Cadisch, Georg
Enlace original: https://cgspace.cgiar.org/handle/10568/66309

Investigación en Agricultura
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Towett, Erick K. ,  Shepherd, Keith D. ,  Cadisch, Georg ,  [Quantification of total element concentrations in soils using total X-ray fluorescence spectroscopy (TXRF).] ,  Quantification of total element concentrations in soils using total X-ray fluorescence spectroscopy (TXRF).
Journal Article 2014

Autor: Shepherd, Keith D. Shepherd, G. Walsh, Markus G

Degradation of land health – the capacity of land, relative to its potential, to sustain delivery of ecosystem services – is recognized as a major global problem in general terms, but remains poorly quantified, resulting in a lack of specific evidence to focus action. Land health surveillance and...

Enlace original: https://cgspace.cgiar.org/handle/10568/75871

Investigación en Agricultura
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Shepherd, Keith D. ,  Shepherd, G. ,  Walsh, Markus G ,  [Land health surveillance and response: a framework for evidence-informed land management] ,  Land health surveillance and response: a framework for evidence-informed land management
Journal Article 2014

Autor: Rosenstock, Todd S. Mpanda, Mathew Rioux, J. Aynekulu, Ermias Kimaro, Anthony A. Neufeldt, Henry Shepherd, Keith D. Luedeling, Eike

Development programs have typically neglected uncertainty and variability in terms of outcomes and socio-ecological context when promoting conservation agriculture (CA) throughout sub-Saharan Africa. We developed a simple Monte Carlo-based decision model, calibrated to global data-sets and parame...

Enlace original: https://cgspace.cgiar.org/handle/10568/65715

Investigación en Agricultura
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Rosenstock, Todd S. ,  Mpanda, Mathew ,  Rioux, J. ,  Aynekulu, Ermias ,  Kimaro, Anthony A. ,  Neufeldt, Henry ,  Shepherd, Keith D. ,  Luedeling, Eike ,  [Targeting conservation agriculture in the context of livelihoods and landscapes] ,  Targeting conservation agriculture in the context of livelihoods and landscapes

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