Resultados de búsqueda - "Nigeria"

The International Plant Diagnostic Network West Africa por Beed, Fenton D., Sikirou, R., Bandyopadhyay, Ranajit, Twizeyimana, M., Miller, S.

“…West Africa’s IPDN was established with a hub lab at IITA Bènin with spoke labs in Ghana, Mali and Senegal with support provided by IITA Nigeria. The urgent need for a network such as the IPDN was demonstrated by results from a survey of stakeholders in the region. …”
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Effect of processing on micronutrient content of chips produced from some plantain and banana hybrids por Adeniji, T.A., Tenkouano, A.

“…Chips were prepared starting from pulp samples resulting from five hybrids of plantain and banana newly released in Nigeria and from a local cultivar used as reference. …”
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Stability of total carotenoid concentration and fresh yield of selected yellow-fleshed cassava (Manihot esculenta Crantz) por Ssemakula, G.N., Dixon, Alfred G.O., Maziya-Dixon, B.B.

“…The effects of genotype (G), environment (E), and G x E interaction on carotenoid concentration and yield of 25 yellow-fleshed (YF) and three white-fleshed (WF) cassava genotypes were investigated at five locations in Nigeria for two consecutive cropping seasons. The locations represented the major cassava growing agroecologies in the country and the objective was to identify stable cassava clones for yield and carotenoid levels. …”
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Progress in breeding for resistance to maize stem borers sesamia calamistis and Eldana saccharina in West and Central Africa por Ajala, S., Kling, J., Cardwell, K., Schulthess, F., Odiyi, A.

“…Stem borer resistant varieties are currently being grown on-farm in Nigeria, Ghana and Cameroon. There is, however, the need to correctly classify the mechanism of resistance in the identified genotypes to improve efficiency of selection and to combine different mechanisms of resistance into different genotypes.…”
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Cassava mosaic virus disease in East Africa: a dynamic disease in a changing environment por Legg, James P., Thresh, J.M.

“…A corollary of this is that resistance, developed originally in Tanzania between 1934 and 1960, and utilized and supplemented at the International Institute of Tropical Agriculture, Nigeria, since 1971, is providing effective CMD control in current pandemic-affected areas of East Africa. …”
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Physical, chemical, and water absorption characterisitics of tropical maize hybrids por Maziya-Dixon, B.B., Kling, J., Okoruwa, A.

“…Hybrids adapted to West and Central Africa were developed by the International Institute of Tropical Agriculture (IITA) in the 1980s, which enable the establishment of several private seed companies in Nigeria. Despite the superior agronomic performance of hybrids, farmers still prefer their traditional cultivars in some areas because they posses desired storage and processing characteristics for local maize dishes. …”
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Characteristics of speargrass (Imperata cylindrica) dominated fields in West Africa: crops, soil properties, farmer perceptions and management strategies por Chikoye, David, Manyong, Victor M., Ekeleme, F.

“…Surveys were conducted in 1996 and 1997 in the coastal/derived savanna (Benin and Nigeria) and southern Guinea savanna (Côte d'Ivoire) to characterize farming systems, soils, and farmers’ management strategies in fields dominated by speargrass. …”
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Host plant resistance and tolerance of Musa landraces and hybrids to nematode infestation por Dochez, C., Speijer, P.R., Schutter, B. de, Dubois, T., Tenkouano, A., Waele, D. de, Ortíz, R.

“…A field experiment was established in the humid forest of southeastern Nigeria to assess host plant response to nematodes. …”
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Wide crossing in African Vigna species por Fatokun, C.A., Perrino, P., Ng, N.Q.

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Effect of mulch quality on earthworm activity and nutrient supply in the humid tropics por Tian, G., Kang, B., Brussaard, Lijbert

“…An experiment was conducted in 1990 and 1991 at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria to study the role of earthworms in the decomposition of plant residue mulches with different qualities. …”
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Effect of drought and plant density on radiation interception, radiation use efficiency and patitioning of dry matter to seeds in cowpea por Craufurd, Peter Q., Wheeler, T.R.

“…Accordingly, a short duration cultivar of cowpea, IT84S-2246-4, was grown at a range of plant densities in well-watered and drought conditions in 1990–91 at two contrasting locations in Nigeria, Ibadan (7°N) and Kano (12°N). Fractional interception of radiation (f) and total above-ground dry matter accumulation (TDM) were measured throughout the growing season and TDM and seed yield (SY) were measured at maturity. …”
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Development of synthetic maize populations for resistance to Striga hermonthica por Kim, S.K., Fajemisin, J., Thé, C., Adepoju, A., Kling, J., Badu-Apraku, Baffour, Versteeg, M., Carsky, R.J., Lagoke, S.T.O.

“…Three populations with white (W), yellow (Y), or mixed (Y/W) grain colour were formed by: (1) intercrossing Striga resistant maize inbred lines followed by two generations of random mating; (2) testing far under artificially induced S. hermonthica infestations in Nigeria, Cameroon, and Ivory Coast and selection of resistant families; (3) two generations of random mating; and (4) two years of testing for resistance. …”
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Responses of cowpea genotypes to indigenous rock phosphate application por Suzuki, K., Fatokun, C.A., Boukar, O.

“…Pot experiments were conducted to identify good responder genotypes to RP application and its effect in cowpea cultivation using low-P soil from Fashola village in southwestern Nigeria and Togolese RP (34% P2O5). Shoot dry weight (SDW) at 8 wk after seeding (WAS) was significantly correlated with P uptake (r = 0.817; P < 0.01) and was therefore used as an indicator to select good responder genotypes. …”
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Measuring the sustainability and economic viability of tropical farming systems: a model from subSaharan Africa por Ehui, Simeon K., Spencer, D.

“…Using a data set available at the International Institute of Tropical Agriculture, we compute the intertemporal and interspatial total factor productivity indices for four cropping systems in southwestern Nigeria using stock of major soil nutrients as the natural resource stock. …”
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Effect of phosphorus application in legume cover crop rotation on subsequent maize in the savanna zone of West Africa por Carsky, R.J., Oyewole, B., Tian, G.

“…A trial was conducted at two P deficient sites in northern Nigeria to test the hypothesis that application of P to legume cover crop fallow can substitute for N application to subsequent maize. …”
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Secondary metabolites content may clarify the traditional selection process of the greater yam cultivars (Dioscorea alata L.) por Lebot, V., Malapa, R., Abraham, K., Molisale, T., Van Kien, N., Gueye, B., Waki, J.

“…The objectives of the present study were to analyze saponins and catechins profiles in 388 D. alata cultivars (landraces) from distant geographical sources (Nigeria, Vietnam, Papua New Guinea and Vanuatu) and to compare them with those of 162 selected hybrids. …”
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Dependency of promiscuous soybean and herbaceous legumes on arbuscular mycorrhizal fungi and their response to bradyrhizobial inoculation in low P soils por Nwoko, H., Sanginga, N.

“…The pots contained soil (available P = 5.33 mg P soilÿ1 , Bray 1) collected at Fashola from a derived savanna in Nigeria. Mycorrhizal colonization differed among promiscuous soybean lines (ranging from 16 to 33%) and was on average 20% for mucuna and lablab. …”
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Survey of distribution and farmer perceptions of speargrass Imperata cylindrica in cassava based cropping systems in West Africa por Chikoye, David, Ekeleme, F., Ambe, J.T.

“…The International Institute of Tropical Agriculture and agricultural research institutions from Benin, Cameroon, Ghana, and Nigeria initiated the Ecologically Sustainable Cassava Plant Protection Project to diagnose cassava production constraints and to use this information to develop and implement sustainable plant protection strategies in West Africa. …”
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Estimates of genetic variances and interrelationships of traits associated with Striga resistance in maize por Akanvou, L., Doku, E.V., Kling, J.

“…As a result, 320 full-sib families were generated and tested under artificial infestation of Striga at two locations, Mokwa and Abuja in Nigeria. Study of gene action involved in the inheritance of S. hermonthica resistance was done. …”
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Calibration development for nutritional evaluation of Yam (Dioscorea sp.) using Near-Infrared Reflectance Spectrophotometry (NIRS) por Alamu, Emmanuel Oladeji, Adesokan, Michael, Maziya-Dixon, B.B.

“…However, the constraints of lengthy analysis time and the cost needed to analyze thousands of these genotypes are major constraints to yam breeding in Nigeria. This study was undertaken to develop and validate calibration equations on the Near-Infrared Reflectance Spectrophotometer (NIRS) for determining chemical compositions of selected yam genotypes. …”
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