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Books and Book Chapters: Recent submissions
Now showing items 361-380 of 977
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Production des ignames; role actuel et perspectives: Guide de recherche de lIita, No. 46 davenir
(1994)L'igname est une importante denree alimen• tajre surtout dans sa zone de production en Afrique occi• dentale. La production mondiale totale d'igname est d'environ 20 A 25 miIlions de tonnes par an et 70 % d. ce total provient du Nigeria. Bien que consideree comme une denree particulierement riche en hydrates de car • bone, certaines especes sont presque aussi riches en pT<' teines que Ie riz ou Ie mals. L'acceptation de plus e; plus large de tubercules de petite taille, off're la possibil; te ... -
An impact assessment of IITAs benchmark area approach
(2003)Here we evaluate the IITA Benchmark Area Approach (BAA), which is being used to deliver general improvements to rural livelihoods in sub-Saharan Africa. The approach began evolving just nine years ago so a formal ex-post impact assessment is not yet appropriate. Hence, we evaluated the approach by comparing it against existing “best practice.” We first established that existing “best practice” in developing sustainable improvements to complex agricultural systems is represented by integrated natural ... -
Improved production of seed yam
(International Institute of Tropical Agriculture, 2001) -
Marketing of gari in Benin City and Enugu, Nigeria
(International Institute of Tropical Agriculture, 2005) -
Determinants de ladoption du Mucuna dans le departement du Mono au Benin
L'analyse des determinants de l'adoption du Mucuna a l'aide d'un moddle econometnquea revele que des variables telles que le statut foncier, le nombre de sarclages avant lardcolte, la source d'informalion, la perte de la petite saison & I'appreciation du niveau defertilite des sols et le revenu tire de la vente de semences de Mucuna avaient eu uneincidence notable sur la probabilite de I'adoption. Pres de 42% des exploitants interrogesont cite I'impossibilite de cultiver la terre pendant la petite ... -
Social impact of soybean in Nigerias southern Guinea savanna
(1999)Most impact studies of agricultural technologies use economic models, with little direct attention being paid to the actual impact on the lives of resource-poor farmers. This paper uses a social impact assessment (SIA) framework to examine the level of adoption and impact of soybean on farm households in Nigeria based on a survey of 203households in Benue State. The results show that the status of soybean has changed from a traditionally male controlled minor export crop, to one of the most important ... -
Identification of cover crops for the semiarid savanna zone of West Africa
Leguminous cover crops may be an appropriate component of sustainable food-production systems in the semi-arids avannas of West and Central Africa- A set of erect and spreading legumes was observed for adaptation D to a semi-arid climate (700-900 mm annual rainfall), without fertilizer application, on three soil t ?es in northern Cameroon- Mucuna pwiens genetically reached l00o/o ground cover 60-90 d after planting, where is Canaralid ensi form is rarely reached1 0070g round cover, Two C. enst ... -
Agrophysiological constarints in intercropped cowpea: an analysis
(1997)Factors affecting cowpea growth in millet/cowpea intercropping were investigated in northern Nigeria. Ecological studies showed that cowpea received from < 30% to > 75% of incident light inside the intercropped canopy. In these light-limited conditions, cowpea varieties with a spreading growth habit can harvest more light than those with an erect growth habit by producing more leaves, as well as expanding their leaf area. However, the local spreading type has a low yield potential because of its ... -
Viral diseases of cowpea and their control by resistance conferring genes
(1997)Cowpea crops are susceptible low more than 20 viral diseases. Some of the most destructive viral pathogens are transmitted from one plant generation to the next through the seed, and thus are generally disseminated to most cowpea-producing regions of the world. Seedborne cowpea viruses, after establishment in plantings as seedborne inoculum, are typically spread within fields by insect vectors (either aphid or beetle species). The most effective control of cowpea viral diseases, universally, has ... -
Adoption and impact of dryseason dualpurpose cowpea in the semiarid zone of Nigeria
(1999)In the semiarid region of West and Central Africa, farmers traditionally cultivate different cowpea varieties for grain and fodder. However, the grain yield potential and the availability of good quality fodder is limited by several factors: insects, pests and diseases, low and erratic rainfall, and the long dry season. In the early 1990s, the International Institute of Tropical Agriculture (IITA), in collaboration with the International Livestock Research Institute (ILRI), initiated a breeding ... -
Les maladies virales du niebe en Afrique: Guide de recherche de lIita, No. 53
(1998)Huit virus ont ete signrues sur Ie niebe en Afrique. Les virus du niebe sont decrits pour les basses terres hum ides et subhumides de I'Afrique occidentale ainsi que pour les wnes ecologiques d'rutitude moyenne en Mrique orientale et australe. Chaque fois que les installations sont limitees et que la caracterisation detaillee s'avere difficile, une simple procedure utilisant une combinaison de tests serologiq ues (test de diffusion par gel d'agar), l'inoculation et les etudes de transmission par ... -
Les engrais; definitions et calculs: guide de recherche de lIita, No. 24
(1997)Les engrais fournissent les elements nutritifs necessaires aux vegetaux pour leur developpement, D'une maniere general, les vegetaux absorbent les elements nutritifs dissous dans I'eau. Toutefois, on ne peut pas se servir uniquement de la solubilite dans l'eau pour mesurer la quantite d'elements nutritifs disponibles aux vegetaux. II existe plusieurs defmitions et termes d'importance pour decrire les engrais. Le "dosage" d'un engrais, par exemple, decrit sa teneur en NP205-K20 en pourcentage du ...