Resultados de búsqueda - "Nigeria"

Genetic variation and genotype x environment interaction in yams (Dioscorea spp.) for root colonization by arbuscular mycorrhiza por Dare, M.O., Abaidoo, Robert C., Fagbola, O., Asiedu, Robert

“…The variation in AM colonization in yam genotypes was evaluated in two experiments at four locations (Ibadan, Onne, Abuja and Ubiaja) in different agroecologies of Nigeria in 2004 and 2005. Twenty-seven genotypes of D. rotundata and 28 of D. alata were investigated in a randomized complete block design with three replicates. …”
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Stability of iron and zinc concentrations in selected genotypes of cassava (Manihot esculenta Crantz) tuberous roots por Ssemakula, G.N., Dixon, Alfred G.O., Maziya-Dixon, B.B.

“…Iron (Fe) and Zinc (Zn) concentrations in tuberous roots of twenty-five cassava (Manihot esculenta Crantz) genotypes were determined over 2 years (2004/2005 and 2005/2006) at five locations representing distinct agroecologies in Nigeria. The objectives were to study the magnitude and nature of genotype by environment interaction (GEI) and stability of the micronutrients concentrations. …”
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Chlorophyll fluorescence analysis for assessing water deficit and Arbuscular Mycorrhizal Fungi (AMF) inoculation in cassava (Manihot esculenta Crantz) por Oyetunji, O., Ekanayake, I.J., Osonubi, O.

“…Field experiment was conducted at Ajibode village while the semi-controlled experiment was conducted at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria. One improved cassava clone (TMS 4(2) 1425) and a landrace (TME1) were investigated. …”
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Fusarium species from the cassava root rot complex in West Africa por Bandyopadhyay, Ranajit, Mwangi, M., Aigbe, S.O., Leslie, John F.

“…Numerous and diverse species of Fusarium were associated with rotted cassava roots in Nigeria and Cameroon. At least 13 distinct amplified fragment length polymorphism (AFLP) groups of Fusarium were distinguishable, each group probably a distinct species, and many of them might represent previously undescribed Fusarium species. …”
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Cowpea viruses: effect of single and mixed infections on symptomatology and virus concentration por Taiwo, M.A., Kareem, K.T., Nsa, I.Y., Hughes, J.

“…Natural multiple viral infections of cultivated cowpeas have been reported in Nigeria. In this study, three Nigerian commercial cowpea cultivars ("Olo 11", "Oloyin" and "White") and two lines from the IITA (IT86D- 719 and TVU 76) were mechanically inoculated with Cowpea aphid-borne mosaic virus (CABMV), Bean southern mosaic virus (SBMV) and Cowpea mottle virus (CMeV) singly, as well asin all possible combinations at 10, 20 and 30 days after planting (DAP). …”
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Genetic variability for grain yield and components in an early tropical yellow maize population under Striga hermonthica infestation por Badu-Apraku, Baffour, Menkir, A., Lum, F.

“…Three hundred full-sib families from cycle 3 of the early maturing yellow endosperm maize (Zea mays L.) population, TZE-Y Pop DT STR, were evaluated under artificial Striga hermonthica infestation at Mokwa and Abuja, Nigeria in 2003. The objectives of this study were to investigate the type of gene action involved in the inheritance of S. hermonthica resistance in TZE-Y Pop DT STR C3, determine the extent of genetic variability available in the population after three cycles of S1 recurrent selection, and the phenotypic and genetic correlation coefficients among the traits used for selecting for resistance to S. hermonthica. …”
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Effect of nicosulfuron dosages and timing on the post emergence control of cogongrass (Imperata cylindrica) in corn (Zea mays) por Fontem Lum, A., Chikoye, David, Adesiyan, S.

“…Field studies were conducted from 2000 to 2002 at Alabata and Ilorin, Nigeria, to evaluate the influence of dosage and time of nicosulfuron application on the control of cogongrass and corn grain yield. …”
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Use of multivariate techniques in studying the flour making properties of some CMD resistant cassava clones por Shittu, T.A., Sanni, Lateef O., Awonorin, S.O., Maziya-Dixon, B.B., Dixon, A.

“…High quality cassava flour (HQCF) is one of the primary products of raw cassava root that has continued to find wider food application in Nigeria. In this study, some 43 newly developed cassava mosaic disease (CMD) resistant clones of cassava were screened based on some physical (flour yield, bulk density, and tri-stimulus colour characteristics (Lab, Chroma and Hue), chemical (moisture,protein, ash, starch, amylose, sugar contents, TTA, pH, and cyanogenic potential), functional (water and oil absorption capacities, water solubility, swelling power, least gelation capacity, diastatic activity, percent damaged starch, and alkaline water retention), and pasting properties. …”
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Unlocking the profit potentials of an innovation: a case study of IITA hybrid plantains and bananas por Faturoti, B., Emah, G., Isife, B., Tenkouano, A., Adeniji, T.A., Lemchi, J.

“…(a leave disease reported to have caused between 30-50% yield loss in plantain across the wortd) were disseminated by IITA plantain improvement programme in three southern states of Nigeria. This study was designed to determine the profit potentials of these disseminated technologies. …”
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Heterotic patterns of early maturing maize inbred lines in Strigafree and Strigainfested environments por Agbaje, S., Badu-Apraku, Baffour, Fakorede, M.A.B.

“…Forty-two Striga resistant, early maturing white endosperm inbred lines were crossed to two intermediate maturing, white endosperm tester lines (1368 and 9071) to generate 84 testcrosses.The 84 testcrosses plus 4 checks were evaluated in Striga-infested environments at Mokwa and Abuja, and in Striga-free environments at Mokwa and Ile-Ife in Nigeria in 2005. Significant general combining ability (GCA) andspecific combining ability (SCA) effects for grain yield were observed. …”
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Evaluation of a cassava germplasm collection for reaction to three major diseases and the effect on yield por Fokunang, C.N., Akem, C., Dixon, A., Ikotun, T.

“…Thirty-five cassava (Manihot esculenta Crantz) genotypes from the International Institute of Tropical Agriculture (IITA), germplasm collection were planted in May 1992 under natural disease infection conditions, at the IITA field plots at Ibadan, Nigeria. The genotypes were evaluated at monthly intervals for six months, for incidence and severity of cassava anthracnose disease (CAD), cassava bacterial blight (CBB) and African cassava mosaic virus (ACMV). …”
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Cogongrass suppression by intercropping cover crops in corn/cassava systems por Chikoye, David, Ekeleme, F., Udensi, U.E.

“…Field experiments were conducted from 1996 to 1999 at three sites located in the forest/savanna transition zone of Nigeria to determine the influence of intercropping cover crops on cogongrass, corn, and cassava growth. …”
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Evaluating host plant reaction of Musa germplasm to Radopholus similis by inoculation of single primary roots por Schutter, B. de, Speijer, P., Dochez, C., Tenkouano, A., Waele, D. de

“…Los experimentos se realizaron bajo condiciones experimentalessimilares en Nigeria y Uganda. En ambas localidades,R. similisfue capaz de penetrar, colonizar y reproducirseen segmentos de raíces primarias de 8 cm de largo de los cultivares susceptibles ‘Agbagba’y ‘Valery’, aumentando respectivamente 40 y 50 veces la población de nematodos al cabo de 8 semanasdespués de la inoculación con 50 nematodos por segmento de raíz. …”
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Genotype x environment effects on severity of cassava bacterial blight disease caused by Xanthomonas axonopodis pv. manihotis por Dixon, A., Ngeve, J., Nukenine, E.

“…Nine cassava genotypes were grown for three years at six sites representing three agro-ecological zones in Nigeria to study their reaction to cassava bacterial blight (CBB), investigate genotype × environment (G×E) interaction patterns for their reaction to CBB, and to identify genotypes with stability to the disease, using the additive main effects and multiplicative interaction (AMMI) statistical model. …”
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Integrated soil management for the dry savanna zone of West Africa: legume rotation and fertilizer N por Carsky, R.J., Oyewole, B., Tian, G.

“…Integrated soil management with leguminous cover crops was studied at two sites in the northern Guinea savanna zone of northern Nigeria, Kaduna (190 day growing season) and Bauchi (150 days). …”
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The feasibility of classical biological control of two major cowpea insect pests por Tamo, Manuele, Bottenberg, H., Arodokoun, D., Adeoti, R.

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Mucuna fallow diffusion in southern Benin por Manyong, Victor M., Houndekon, V.A., Sanginga, P., Vissoh, Pierre V., Honlonkou, A.N.

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Evaluation of cassava cultivars for canopy retention and its relationship with field resistance to green spider mite por Nukenine, E.N., Dixon, Alfred G.O., Hassan, A.T., Asiwe, J.A.N.

“…Three field trials were conducted at IITA, Ibadan, Nigeria between 1993 and 1995 to identify a rapid method of screening cassava (Manihot esculenta Crantz) cultivars for canopy retention and to determine the association between canopy retention and resistance to green spider mite (Mononychellus tanajoa Bondar) in cassava. …”
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Effect of planting season on cassava anthracnose disease development por Fokunang, C.N., Akem, C.N., Ikotun, T., Dixon, Alfred G.O.

“…Twelve cassava (Manihot esculenta Crantz) genotypes were planted under natural field conditions for two different cropping seasons (wet and dry), in 1992 and 1993 at the research farm of the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria. The trial studied the effect of planting season on cassava anthracnose disease (CAD) symptoms expression (disease severity index, canker size and first canker distance from the ground). …”
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Effectiveness of imazaquin seed treatment on Striga gesnerioides control and growth traits of seven cowpea genotypes por Lado, A., Hussaini, M.A., Kamara, A.

“…Field trials were conducted to evaluate the efficacy of imazaquin seed treatment (at 0.00, 0.06, and 0.24 kg a.i. ha−1) on Striga gesnerioides control and the growth of seven cowpea genotypes (Achishiru, IT97K-1263, IT97K-390-2, IT98K-133-1-1, TVU-1283, TVU-1542, and TVU-1908) at the Teaching and Research Farm of the Faculty of Agriculture of Bayero University, Kano, Nigeria, during the rainy seasons of 2010 and 2011. …”
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