Resultados de búsqueda - "Nigeria"

Genetic diversity of tropical early-maturing maize inbreds and their performance in hybrid combinations under drought and optimum growing conditions por Oyekunle, M., Badu-Apraku, Baffour, Hearne, S., Franco, J.

“…One hundred and fifty hybrids derived from 30 early-maturing inbreds plus six checks were evaluated at three locations in Nigeria for 2 years to assess their performance under drought and well-watered conditions. …”
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Evaluation of white yam (Dioscorea rotundata) genotypes for Arbuscular mycorrhizal colonization, leaf nutrient concentrations and tuber yield under NPK fertilizer application por Dare, M.O., Fagbola, O., Abaidoo, Robert C., Asiedu, Robert

“…The effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizerrates on the AM colonization, leaf nutrient concentrations, and tuber yields of eleven genotypes ofDioscorea rotundata were investigated at Ibadan, Nigeria. The soil was ferric luvisol. Elevengenotypes were selected from the previously conducted screening of 75 genotypes of D. rotundata forfertilizer response. …”
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Yam propagation using Aeroponics technology por Maroya, N., Balogun, M., Asiedu, Robert, Aighewi, B.A., Kumar, P. Lava, Augusto, J.

“…Aims: To study yam propagation and seed yam tuber production in aeroponics system.Study Design: The experiment was conducted in a randomized complete block designand treatments were replicated three times.Place of Study: This experiment was carried out at the International Institute of TropicalAgriculture Headquarters at Ibadan in Nigeria.Methodology: The experiment tested fresh vine cuttings of five yam genotypes of twospecies in an aeroponics system. …”
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Genetic analysis of drought tolerance in adapted X exotic crosses of maize inbred lines under managed stress conditions por Adebayo, M.A., Menkir, A., Blay, E., Gracen, V.E., Danquah, E.Y., Hearne, S.

“…These hybrids were evaluated under bothcontrolled drought stress and well-watered conditionsat Ikenne in Nigeria in 2010 and 2011. Average meanyields of hybrids under drought stress represented23 % of the average yield of hybrids under fullirrigation. …”
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Exploitation of beneficial alleles from maize (Zea mays L.) landraces to enhance performance of an elite variety in water stress environments por Meseka, S.K., Menkir, A., Obeng-Antwi, K.

“…Twelve backcross (BC1F2) populations together with their recurrent parent (TZLCOMP4C1) and a commercial hybrid (Oba Super1) were evaluated under DS, well watered (WW) conditions during the dry season, and in seven ML trials in Nigeria. Significant differences were observed among genotypes for all traits except for ear aspect score under DS conditions. …”
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DNA Barcoding to Improve the Taxonomy of the Afrotropical Hoverflies (Insecta: Diptera: Syrphidae) por Jordaens, K., Goergen, Georg E., Virgilio, M., Backeljau, B., Vokaer, A., Meyer, M. de

“…In order to assist in their identification, and to improve the taxonomy of this group, we constructed a reference dataset of 513 COI barcodes of 90 of the more common nominal species from Ghana, Togo, Benin and Nigeria (W Africa) and added ten publically available COI barcodes from nine nominal Afrotropical species to this (total: 523 COI barcodes; 98 nominal species; 26 genera). …”
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Genetic variability, heritability and genetic advance studies in topcross and three-way cross maize (Zea mays L) hybrids por Sesay, S., Ojo, D., Ariyo, O.J., Meseka, S.

“…This study was designed to assess the magnitude of genetic variability, heritability and genetic advance of traits in top-cross and three-way cross maize (Zea mays L) hybrids evaluated at three locations in South-Western Nigeria. The trial consisted of ten genotypes each of top-cross and three-way cross hybrids arranged in randomized complete block design with three replications. …”
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Genetic diversity of cassava (Manihot esculenta Crantz) landraces and cultivars from southern, eastern and central Africa por Kawuki, Robert S., Herselman, L., Labuschagne, Maryke T., Nzuki, I., Ralimanana, I., Bidiaka, M., Kanyange, M.C., Gashaka, G., Masumba, E., Mkamilo, G.S., Gethi, J., Wanjala, Bramwel W., Zacarias, A., Madabula, F., Ferguson, Morag E.

“…This is likely to reflect original germplasm introductions, gene flow including farmer exchanges, disease pandemics, past breeding programmes and the introduction of cultivars from the International Institute of Tropical Agriculture – Nigeria. Information generated from this study will be useful to justify and guide a regional cassava genetic resource conservation strategy, to identify gaps in cassava diversity in the region and to guide breeding strategies.…”
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Pathogenicity and damage potential of five species of plantparasitic nematodes on plantain (Musa spp., AAB genome) cv. Agbagba por Coyne, Danny L., Omowumi, A., Rotifa, I., Afolami, S.

“…The pathogenicity of five plant-parasitic nematode species, Radopholus similis, Pratylenchus coffeae, Helicotylenchus multicinctus, Hoplolaimus pararobustus and Meloidogyne spp., commonly recorded from banana and plantain in West and Central Africa, was assessed on plantain (Musa spp., AAB genome) cv. Agbagba in Nigeria. The pest status of H. pararobustus was demonstrated for the first time in addition to H. multicinctus, while the importance of P. coffeae and R. similis was further confirmed. …”
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Gene action controlling grain yield and other agronomic traits of extra-early quality protein maize under stress and non-stress conditions por Annon, B., Badu-Apraku, Baffour

“…Ninety six extra-early QPM single-crosses derived from 24 extra-early QPM inbreds using the North Carolina Design II plus four checks were evaluated under stress (drought and low-N) and non-stress environments in Nigeria, 2012 and 2013. The objectives were to (i) determine the gene action for grain yield and other agronomic traits in the QPM inbreds (ii) identify the best inbred testers across environments (iii) classify the inbreds into heterotic groups and (iv) evaluate the performance and stability of the hybrids. …”
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Yield stability of yellow maize hybrids in the Savannas of west Africa por Meseka, S.K., Menkir, A., Olakojo, S., Jalloh, A., Coulibaly, N., Bossey, O.

“…However, A1001-19 was relatively stable and was the best hybrid in 12 of the 17 environments across Mali, Nigeria, and Sierra Leone. Kudu and Zaria 2013 were the most discriminating locations for the hybrids. …”
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Evaluating consistency of resistance reactions of openpollinated maize cultivars to Striga hermonthica (Del.) Benth under artificial infestation por Menkir, A., Franco, J., Adepoju, A., Bossey, B.

“…The present study was conducted at Abuja and Mokwa in Nigeria for 5 and 6 yr, respectively, with and without artificial Striga infestation (i) to examine the reaction patterns of open-pollinated maize cultivars with varying levels of resistance to S. hermonthica and (ii) to identify cultivars or genotypes with stable resistance to the parasite across varying growing environments. …”
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The potential of satellite radar altimetry in flood forecasting: concept and implementation for the Niger-Benue River Basin por Pandey, Rajesh, Amarnath, Giriraj

“…This present study aims to demonstrate the capability of altimeter-based flood forecasting along the Niger-Benue River in Nigeria. The study includes the comparison of decadal (at every 10 days from Jason-2) or monthly (at every 35 days from Envisat/AltiKa) observations from 2002 to 2014, with historical in situ measurements from 1990 to 2012. …”
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Flood forecasting in Niger-Benue basin using satellite and quantitative precipitation forecast data por Haile, Alemseged Tamiru, Tefera, F.T., Rientjes, T.H.M.

“…We evaluated the potential of satellite and weather forecast data as input to a parsimonious flood forecasting model to provide information for flood early warning in the central part of Nigeria. We calibrated the HEC-HMS rainfall-runoff model using rainfall data from post real time Tropical Rainfall Measuring Mission (TRMM) Multi satellite Precipitation Analysis product (TMPA). …”
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Determinants of crop residue use along an intensification gradient in West Africa's Savannah zones por Akinola, Adebayo A., Abdoulaye, Tahirou, Valbuena, Diego, Erenstein, Olaf, Haileslasie, A., Germaine, I., Shehu, M., Ayedun, B.

“…The study compares and contrasts crop residue uses in 3 case study sites along an agricultural intensification gradient in the Sahel-Sudano zone of Niger and Nigeria. It draws on data collected from 24 vii/ages involving 480 households and employs a Tobit model to analyse the determinants of crop residue uses for cereals and legumes. …”
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Characterization of trypanosoma congolense stocks from the West and East African regions using molecular karyotyping. por Waihenya, R.

“…Trypanosoma congolense stocks from West Africa (Gambia, Burkina Faso and Nigeria) and East Africa (Kenya and Uganda) were grown and cloned in irradiated mice. …”
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Genetic variances and relationship among traits of an early maturing maize population under drought-stress and low nitrogen environments por Talabi, A.O., Badu-Apraku, Baffour, Fakorede, M.A.B.

“…North Carolina Design I was used to develop 250 full-sib progenies from the improved population, which were evaluated in three drought-stress and two low N environments in Nigeria, 2011 to 2013. Additive genetic variances were not significant for most traits under the research conditions. …”
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Combining ability and heterotic patterns of extra-early maturing white maize inbreds with genes from Zea diploperennis under multiple environments por Amegbor, I.K., Badu-Apraku, Baffour, Annor, B.

“…Sixty-three extra-early white maize inbred lines containing genes from Zea diploperennis were crossed to four elite testers to obtain 252 single-cross hybrids and evaluated together with four checks at four locations for 2 years under drought, Striga-infested, low N and optimal environments in Nigeria. The GCA and SCA effects were significant (P ≤ 0.01) with preponderance of GCA over SCA effects for all measured traits indicating that additive genetic effects were predominant in the lines under all the contrasting environments. …”
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Cassava (Manihot esculenta Crantz) stems quality for root production effectiveness por Yomeni, M.O., Akoroda, M.O., Dixon, Alfred G.O.

“…Four attributes of stem quality: number of nodes1, diameter2, and stem weight3 per 25-cm plantable stake (PS), and the stake position4 were investigated in field trials at Blocks 4, 18 and 24 of the International Institute of Tropical Agriculture (IITA) Onne, Ajibode, Ibadan, Federal College of Agriculture, Akure and Dogodawa, Zaria, Nigeria to evaluate the relationship between good quality cassava planting material and the stem and root yields and to assess the best stake position that gives the best stem and root yields. …”
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Relative changes in genetic variability and correlations in an earlymaturing maize population during recurrent selection por Badu-Apraku, Baffour, Akinwale, R.O., Fakorede, M.A.B., Oyekunle, M., Franco, J.

“…Fifty S1 families, derived from each cycle, were evaluated under Striga-infested and Striga-free conditions at Mokwa, Ikenne and Abuja, Nigeria, in 2005 and 2007. Under Striga infestation, genetic variances for grain yield, days to anthesis, plant height and Striga damage generally increased in the advanced cycles of selection. …”
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