Resultados de búsqueda - "Nigeria"

Assessment of lifetime performance of small ruminants under different feeding systems por Amole, Tunde A., Zijlstra, M., Descheemaeker, Katrien K., Ayantunde, Augustine A., Duncan, Alan J.

“…In order to gain a better understanding of promising feed interventions for improvement of small ruminant production in Southwestern Nigeria, a dynamic modelling approach was used to explore the effect of different feeding strategies on the lifetime productivity of West African Dwarf (WAD) goats. …”
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Diversity of arbuscular mycorrhizal fungi in Brazil’s Caatinga and experimental agroecosystems por Pontes, J.S., Oehl, F., Marinho, F., Coyne, Danny L., Silva, D.K.A. da, Yano-Melo, A.M., Maia, L.C.

“…This study was undertaken to quantify the effect of a soybean crop (compared with a sorghum control) on S. hermonthica emergence in subsequent maize in three farmers' fields in northern Nigeria. Soybean cultivar TGx 1740-7F, previously identified as efficacious for S. hermonthica seed germination, was grown at four densities without P fertilizer to test the effect of increasing plant density of soybean on subsequent S. hermonthica parasitism. …”
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Seed coating herbicide tolerant maize hybrids with imazapyr for Striga hermonthica (Del.) Benth control in the West African savanna por Chikoye, David, Fontem, L.A., Menkir, A.

“…Field trials were conducted in Nigeria at Abuja and Mokwa (southern Guinea savanna) in 2005 and 2006, and at Zaria (northern Guinea savanna) and Sabongari (Sudan savanna) in 2006, to evaluate the performance of imazapyr coated maize hybrids with the herbicide resistance (IR) gene under Striga infestation. …”
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Cultivar evaluation and trait analysis of tropical early maturing maize under Strigainfested and Strigafree environments por Badu-Apraku, Baffour, Akinwale, R.

“…Fifteen early cultivars were evaluated under Striga-infested and Striga-free conditions for 2 years at Mokwa and Abuja, Nigeria. The objective was to examine their performance based on multiple traits under stress and non-stress conditions and analyze the interrelationship among traits using genotype-by-trait (GT) biplot so as to assess the value of traits used in the base index for selection for Striga resistance and improved grain yield (YLD). …”
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Combining ability of earlymaturing white maize inbreds under stress and nonstress environments por Badu-Apraku, Baffour, Oyekunle, M., Akinwale, R.O., Lum, A.F.

“…Thirty-six diallel crosses derived from nine early maturing white maize inbreds were evaluated under drought, well-watered, striga-infested, and striga-free conditions at five locations in Nigeria between 2007 and 2009. The objective was to examine the combining ability, performance and stability of the inbreds, and to identify the heterotic groups. …”
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Gene action controlling normalized difference vegetation index in crosses of elite maize (Zea mays L.) inbred lines por Adebayo, M.A., Menkir, A., Hearne, S., Kolawole, A.O.

“…The parents and the hybrids were evaluated under full irrigation and drought stress conditions in the dry seasons of 2010 and 2011 at Ikenne, southwest Nigeria. Normalized difference vegetation index (NDVI) was recorded at 3- and 8-leaf growth stages. …”
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Combining ability and performance of extra-early maturing yellow maize inbreds in hybrid combinations under drought and rain-fed conditions por Akaogu, I.C., Badu-Apraku, Baffour, Adetimirin, Victor O.

“…A total of 120 single-cross hybrids and an open-pollinated control variety were evaluated for 2 years at two locations under managed drought and rain-fed conditions in Nigeria. The objective of the present study was to assess their performance, classify them into distinct heterotic groups and identify promising hybrids for commercialization in the West and Central Africa sub-region. …”
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Resistance of F1 segregating populations derived from crosses between wild banana accessions Musa acuminata spp. burmannicoides Calcutta 4 and M. balbisiana Montpellier to black le... por Vroh Bi, Irie, Zandjanakou-Tachin, Martine, Mbah, W., Tenkouano, A., Ojiambo, P., Bandyopadhyay, Ranajit

“…The most common Mycosphaerella leaf spot disease in Nigeria is black leaf streak caused by M. fijiensis. …”
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Sustainable inclusion of smallholders in the emerging high quality cassava flour value chains in Africa: challenges for agricultural extension services por Adebayo, K., Abayomi, L., Abass, A., Dziedzoave, N.T., Forsythe, L., Hillocks, R.J., Gensi, R., Gibson, R., Graffham, A.J., Ilona, Paul, Kleih, Uli K., Lamboll, R.I., Mahende, G., Martin, A.M., Onumah, G.E., Orr, A.W., Posthumus, Helena, Sanni, Lateef O., Sandifolo, V.S., Westby, Andrew

“…Based on the premise that smallholders often get excludedas markets become more commercial, this paper draws lessons from the Cassava: Adding Value for Africa (C:AVA) Project by exploring the main issues and challenges facing extension service partners in five African countries (Nigeria, Ghana, Tanzania, Ugandaand Malawi). These lessons include issues around competiveness in the supply of raw material, assisting smallholders to produce value-added products competitively, working with a range of partners at different stages in the value chain to take pilot studies to scale, ensuring and maintaining quality, selecting appropriate technologies for different circumstances, anticipating negative effects of the market environment on smallholders and ensuring that strategies for ensuring benefits for women and other disadvantaged groups are incorporated into extension service operations. …”
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Optimal units of selection – how many plants are representative of diversity in collections of cowpea landrace accessions? por Hearne, Sarah Jane, Franco, J., Magembe, E.

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Developing a Nigerianspecific food and nutrient coding database por Day, R.S., Douglass, D.L., Maziya-Dixon, B.B.

“…The Food Intake Analysis System (FIAS) (developed by The University of Texas School of Public Health and the USDA Agricultural Research Services Food Surveys Research Group) and food and nutrient data from the USDA databases were used to aid creation of foods and recipes specific to Nigeria. USDA data had only 214 of the basic foods reported consumed by Nigerians. …”
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Evaluating intra row spacing to optimize techniques for artificial infestation of Striga hermonthica (Del.) Benth, screening for resistance in maize por Ibikunle, O., Menkir, A., Smith, M., Kling, J.

“…The experiments were conducted at Mokwa, and Abuja, in Nigeria for two and one season, respectively. Mean square for genotype × spacing interac- tion was not significant in the entire test environments. …”
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Evaluation of atoxigenic isolates of Aspergillus flavus as potential biocontrol agents for aflatoxin in maize por Atehnkeng, J., Ojiambo, P.S., Ikotun, T., Sikora, R.A., Cotty, P.J., Bandyopadhyay, Ranajit

“…The abilities of eleven naturally occurring atoxigenic isolates in Nigeria to reduce aflatoxin contamination in maize were evaluated in grain competition experiments and in field studies during the 2005 and 2006 growing seasons. …”
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S1 family selection in early maturing maize populations in Striga infested and Striga free environments por Badu-Apraku, Baffour, Fakorede, M.A.B., Lum, A.F.

“…A study was conducted in 2005 and 2006 in Nigeria to determine the level of resistance to Striga hermonthica for two early-maturing maize populations, one white and one yellow, and to assess the progress made in improving each for grain yield and level of resistance after four cycles of S1 recurrent selection. …”
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Variation in nutrient and antinutrient contents of tubers from yellow yam (Dioscorea cayenensis) genotypes grown at two locations por Akin-Idowu, P.E., Odunola, O.A., Asiedu, Robert, Maziya-Dixon, B.B., Uwaifo, A.O.

“…Eight genotypes of yellow yam (Dioscorea cayenensis) were planted at locations in two major yam-growing agroecologies of Nigeria (Onne in the humid forest zone and Ibadan in the forest/savannah transition zone) for assessment of the contents of minerals and antinutrients. …”
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Effects of sole cropping, intercropping and rotation with legume trap-crops on striga control and maize grain yield in farmers' fields in the Guinea savannas por Kureh, I., Kamara, A.Y.

“…On-farm trials were conducted in 2001 to 2003 in the northern Guinea savanna of Nigeria to evaluate integrated Striga hermonthica control methods under farmer-managed conditions. …”
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Symbiotic nitrogen fixation of two soybean genotypes as affected by rootknot nematodes and microsymbionts por Coyne, Danny L., Oyekanmi, E.

“…The experiments were undertaken in Nigeria in pots, using two soybean genotypes (TGx 1448-2E and TGx 1485-1D) with differential susceptibility to nematode. …”
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Greenmaize potential of hybrid and openpollinated cultivars at varying levels of applied nitrogen: relationship with grain yield por Kim, S.K., Adetimirin, Victor O., Yoon, S.T., Adepoju, A., Gbadamosi, B.A.

“…Two sets (white- and yellow-kernelled) of six cultivars of field-maize, each comprising three hybrids and three open-pollinated (OP) varieties, were evaluated for green-maize productivity under three levels of nitrogen fertilisation (0, 60 and 120 kg ha−1) at two locations in southwestern Nigeria. The relationship between green-maize and grain yield was also investigated. …”
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Genetic analysis of resistance to gray leaf spot of midaltitude maize inbred lines por Menkir, A., Ayodele, M.

“…The parents and the hybrids were evaluated in separate trials in five environments in Nigeria. Both general (GCA) and specific (SCA) combining abilities were significant (P < 0.001), with GCA accounting for >70% of the variation for GLS scores, days to silking, plant height, ear height, ear aspect, and ear rot; 68% for grain yield; and 60% for plant aspect (visual phenotypic appeal) score. …”
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Response of soybean genotypes to Alectra vogelii infestation under natural field conditions por Kureh, I., Alabi, S., Kamara, A.

“…Field studies were conducted in 1995 and 1996 in the northern Guinea savanna of Nigeria to determine the response of 22 soybean genotypes to Alectra infestation. …”
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