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Journal Article 1996

Autor: Powell, J.M. Fernández Rivera, S. Hiernaux, Pierre H.Y. Turner, M.D.

In the Sahel of West Africa, the productivities of rangelands, croplands and livestock are inextricably linked. Cattle, sheep and goats graze rangelands and crop residues, and their manure/urine is used to fertilize crops. Rangelands provide important feeds during the manuring period, resulting i...

Enlace original: https://cgspace.cgiar.org/handle/10568/28104

Investigación en Agricultura
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Powell, J.M. ,  Fernández Rivera, S. ,  Hiernaux, Pierre H.Y. ,  Turner, M.D. ,  [Nutrient cycling in integrated rangeland/cropland systems of the Sahel] ,  Nutrient cycling in integrated rangeland/cropland systems of the Sahel
Journal Article 1998

Autor: Brouwer, J. Powell, J.M.

In African agriculture, availability of nutrients for crop production can be increased using external inputs such as mineral fertiliser. However, for many African farmers the large scale use of external inputs will remain beyond reach for the foreseeable future. There is, therefore, also a need f...

Enlace original: https://cgspace.cgiar.org/handle/10568/30022

Investigación en Agricultura
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Brouwer, J. ,  Powell, J.M. ,  [Increasing nutrient use efficiency in West-African agriculture: The impact of micro-topography on nutrient leaching from cattle and sheep manure] ,  Increasing nutrient use efficiency in West-African agriculture: The impact of micro-topography on nutrient leaching from cattle and sheep manure
Journal Article 1995

Autor: Williams, Timothy O. Powell, J.M. Fernández Rivera, S.

Animal manure is of vital importance in maintaining soil fertility in semiarid west Africa due to the low level of use of inorganic fertilizer. Using data from Niger however, it is shown that insufficient animals are available to provide the manure needed to sustain crop yields on a long-term bas...

Enlace original: https://cgspace.cgiar.org/handle/10568/29323

Investigación en Agricultura
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Williams, Timothy O. ,  Powell, J.M. ,  Fernández Rivera, S. ,  [Soil fertility maintenance and food crop production in semi-arid West Africa: Is reliance on manure a sustainable strategy?] ,  Soil fertility maintenance and food crop production in semi-arid West Africa: Is reliance on manure a sustainable strategy?
Journal Article 1995

Autor: Williams, Timothy O. Powell, J.M. Fernández Rivera, S.

Despite its vital role in supporting crop production, a key question that has often been posed is whether sufficient amounts of manure are available to permit adequate food production and improvement of soil quality on a long-term basis. While this question can be addressed at a regional, nationa...

Enlace original: https://cgspace.cgiar.org/handle/10568/29547

Investigación en Agricultura
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Williams, Timothy O. ,  Powell, J.M. ,  Fernández Rivera, S. ,  [Manure availability in relation to sustainable food crop production in semi-arid West Africa: Evidence from Niger] ,  Manure availability in relation to sustainable food crop production in semi-arid West Africa: Evidence from Niger
Journal Article 1998

Autor: Powell, J.M. Ikpe, F.N. Somda, Z.C. Fernández Rivera, S.

Most farming systems in semi-arid West Africa rely on organic matter recycling for maintaining soil fertility. The cycling of biomass through ruminant livestock into dung (faeces) and urine that fertilize the soil has long been an important factor in the nutrient cycling processes of these integr...

Enlace original: https://cgspace.cgiar.org/handle/10568/32910

Investigación en Agricultura
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Powell, J.M. ,  Ikpe, F.N. ,  Somda, Z.C. ,  Fernández Rivera, S. ,  [Urine effects on soil chemical properties and the impact of urine and dung on pearl millet yield] ,  Urine effects on soil chemical properties and the impact of urine and dung on pearl millet yield
Journal Article 1997

Autor: Somda, Z.C. Powell, J.M. Bationo, B. André

The changes in soil pH and mineral N concentrations of cattle and sheep urine patches were compared to those occurring in fertilizer urea placement zones in a study in Niger. Urine and fertilizer solutions each containing 400 mg N (800 kg N/ha) were spread onto individual plots covering a surface...

Enlace original: https://cgspace.cgiar.org/handle/10568/32871

Investigación en Agricultura
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Somda, Z.C. ,  Powell, J.M. ,  Bationo, B. André ,  [Soil PH and nitrogen changes following cattle and sheep urine deposition] ,  Soil PH and nitrogen changes following cattle and sheep urine deposition
Journal Article 1994

Autor: Powell, J.M. Fernández Rivera, S. Hofs, S.

The cycling of biomass through livestock into manure and urine that fertilise the soil is important linkage between livestock and soil productivity in semi-arid West Africa. This study was conducted to determine the effects of different forage leaves on the amounts and forms of nutrients excreted...

Enlace original: https://cgspace.cgiar.org/handle/10568/28123

Investigación en Agricultura
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Powell, J.M. ,  Fernández Rivera, S. ,  Hofs, S. ,  [Effects of sheep diet on nutrient cycling in mixed farming systems of semi-arid West Africa] ,  Effects of sheep diet on nutrient cycling in mixed farming systems of semi-arid West Africa
Journal Article 1987

Autor: Powell, J.M. Mohamed-Saleem, M.A.

Investigates Nitrogen and Phosphorus transfers in a crop - livestock system in the subhumid zone of Nigeria. Estimates N and P removed from cropland during crop residue grazing and returned to the land through manure, and the contribution crop residues make to cattle diet during the dry season.

Enlace original: https://cgspace.cgiar.org/handle/10568/28109

Investigación en Agricultura
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Powell, J.M. ,  Mohamed-Saleem, M.A. ,  [Nitrogen and phosphorus transfers in a crop-livestock system in West Africa] ,  Nitrogen and phosphorus transfers in a crop-livestock system in West Africa
Journal Article 1992

Autor: Powell, J.M. Hons, F.M.

A four year field study was conducted in central Texas to evaluate the effects of sorghum (Sorghum bicolor L. Moench) genotype, fertilizer N application rate and stover removal on crop yields and plant nutrient uptake and partitioning. Fertilizer N application rates of 112 kg ha were generally su...

Enlace original: https://cgspace.cgiar.org/handle/10568/28129

Investigación en Agricultura
USA
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Powell, J.M. ,  Hons, F.M. ,  [Fertilizer nitrogen and stover removal effects on sorghum yields and nutrient uptake and partitioning] ,  Fertilizer nitrogen and stover removal effects on sorghum yields and nutrient uptake and partitioning
Journal Article 1993

Autor: Kouame, C.N. Powell, J.M. Renard, C.A. Quesenberry, K.H.

The integration of forage legumes into the low-input, cereal-based farming system of the Sahel may be the key to sustaining soil, crop, and livestock production. The objectives of this study were to evaluate the effects of intercropping the forage legumes Stylosanthes fruticosa (Retz.) Slston or ...

Enlace original: https://cgspace.cgiar.org/handle/10568/28159

Investigación en Agricultura
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Kouame, C.N. ,  Powell, J.M. ,  Renard, C.A. ,  Quesenberry, K.H. ,  [Plant yields and fodder quality related characteristics of millet-stylo intercropping systems in the Sahel] ,  Plant yields and fodder quality related characteristics of millet-stylo intercropping systems in the Sahel

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