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Nasi, RobertSchwartz, D.[The contribution of carbon13 isotopic tracing of soil organic matter to the reconstitution of forest--savannah successions in the coastal zone of Gabon]The contribution of carbon13 isotopic tracing of soil organic matter to the reconstitution of forest--savannah successions in the coastal zone of Gabon
Amézquita Collazos, EdgarRao, Idupulapati M.Rondón, Marco AntonioAyarza, Miguel AngelHoyos, P.Molina, DLCorrales, I.I.[Mejoramiento de oxisoles de baja fertilidad para sistemas agropastoriles de alta productividad en sabanas tropicales de Colombia]Mejoramiento de oxisoles de baja fertilidad para sistemas agropastoriles de alta productividad en sabanas tropicales de Colombia
Basamba, T.A.Barrios, E.Amézquita Collazos, EdgarRao, Idupulapati M.Singh, B.R.[Efecto de sistemas de labranza en el rendimiento de maíz en un oxisol de la sabana colombiana: fraccionamiento de materia orgánica y fósforo del suelo]Efecto de sistemas de labranza en el rendimiento de maíz en un oxisol de la sabana colombiana: fraccionamiento de materia orgánica y fósforo del suelo
Friesen, Dennis K.Thomas, Richard J.Rivera, M.Asakawa, N.Bowen, W.[Dinámicas de nitrógeno en monocultivos y cultivos en rotación en oxisoles de los Llanos Orientales de Colombia]Dinámicas de nitrógeno en monocultivos y cultivos en rotación en oxisoles de los Llanos Orientales de Colombia

The functioning of trees as a safety-net for capturing nutrients leached beyond the reach of crop roots was evaluated by investigating changes in exchangeable cations (Ca, Mg, and K) and pH in a wide range of medium to long term alley cropping trials in the derived savanna of West Africa, compare...


Vanlauwe, BernardAihou, K.Tossah, B.K.Diels, J.Sanginga, NteranyaMerckx, R.[Senna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone]Senna siamea trees recycle Ca from a Ca-rich subsoil and increase the topsoil pH in agroforestry systems in the West African derived savanna zone
Borrero, GonzaloFriesen, Dennis K.Oberson, AstridRodríguez, M.Rao, Idupulapati M.[Destinos de fósforo aplicado como fertilizante en oxisoles de los Llanos Orientales de Colombia: fraccionamiento secuencial]Destinos de fósforo aplicado como fertilizante en oxisoles de los Llanos Orientales de Colombia: fraccionamiento secuencial

Effective management and conservation of wildlife populations require reliable estimates of population size, which can be difficult and costly to obtain. We evaluated how precision in estimates of herd size and abundance varies with sample size and strip width using two field surveys and bootstra...


Ogutu, J.Bhola, N.Piepho, Hans-PeterReid, Robin S.[Efficiency of strip- and line-transect surveys of African savanna mammals]Efficiency of strip- and line-transect surveys of African savanna mammals

A total of 35 herds of cattle from 2 inistitutional farms, and 6 privately-owned farms which were semi-intensively managed, and 17 nomadic Fulani herds were studied between January 1984 and December 1993 to evaluate the age of first calving (AFC) in the three major indigenous breeds of the Savann...


Sackey, Anthony K.B.Sanni, Bamidele D.Abdullahi, Shehu U.Fadason, T.S.[Observation on the Age at First Calving in the Savannah Breeds of Cattle in Northern Nigeria]Observation on the Age at First Calving in the Savannah Breeds of Cattle in Northern Nigeria

The potential impact and return to investment from introducing improved dualpurpose cowpea for food and fodder in northern Nigeria was investigated using a combination of farmers' workshops and village and household level surveys. Out of the 462 households surveyed, 41 % were adopters, 9% had bee...


Okike, I.Kristjanson, Patricia M.Tarawali, Shirley A.Singh, B.B.Kruska, R.L.Mounyong, V.M.[Potential adoption and diffusion of improved dual-purpose cowpea in the dry savannas of Nigeria: an evaluation using a combination of participatory and structured approaches]Potential adoption and diffusion of improved dual-purpose cowpea in the dry savannas of Nigeria: an evaluation using a combination of participatory and structured approaches

Fuel characteristics, fire behaviour and temperature were studied in relation to grazing, dominant grass type and wind direction in West African savanna–woodland by lighting 32 prescribed early fires. Grazing significantly reduced the vegetation height, total fuel load, and dead and live fuel fra...


Savadogo, P.Zida, D.Sawadogo, L.Tiveau, D.Tigabu, M.Oden, P.C.[Fuel and fire characteristics in savanna–woodland of West Africa in relation to grazing and dominant grass type]Fuel and fire characteristics in savanna–woodland of West Africa in relation to grazing and dominant grass type

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