The performance of 5 promising pre-release hybrid water yam (D. alata) varieties (TDa 98/01166; TDa 98/01176; TDa 98/01168; TDa 99/91169; and TDa 99/00240) evaluated for high and stable yields, pest and disease resistance and desirable food qualities, was determined in 2004 and 2005 in 6 location...
Ikeorgu, J.G.
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Egesi, Chiedozie N.
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Asiedu, Robert
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[Evaluation of the performance of five hybrid water yam clones in the yam belt of Nigeria]
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Evaluation of the performance of five hybrid water yam clones in the yam belt of Nigeria
Nwachukwu, E.C.
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Ikeorgu, J.
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Asiedu, Robert
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[Multilocational evaluation of newly developed white yam hybrid genotype]
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Multilocational evaluation of newly developed white yam hybrid genotype
Yam (Dioscorea sp.) is an extremely important delicacy in Cameroon, with some estimated 45,215 hectares devoted to it, and corresponding annual production of 275,101 metric tons. Production is constrained by several factors including the limited availability and cost of planting material, as well...
Njukwe, E.
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Amah, D.
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Ndango, R.
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Tenkouano, A.
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Asiedu, Robert
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[Introduction and evaluation of improved varieties of Dioscorea rotundata, and D. cayenensis with high micronutrient content in Cameroon]
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Introduction and evaluation of improved varieties of Dioscorea rotundata, and D. cayenensis with high micronutrient content in Cameroon
A two year trial was conducted at the inland valley of the National Root Crop Research Institute, Umudike during the dry season of 2003/2004 and 2004/2005. The purpose was to evaluate the suitability of five hybrid yam clones of dry season yam production. The yams were planted in manually made ri...
Ikeorgu, J.
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Asiedu, Robert
,
[Evaluation of 5 hybrid yams for dry season yam production in lowland areas]
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Evaluation of 5 hybrid yams for dry season yam production in lowland areas
Vitamin A deficiency (VAD) is prevalent in most developing countries. Increasing provitamin A carotenoid content in staple crops such as yam, maize and cassava can minimize this deficiency. Yam (Dioscorea species) is a major staple food in many tropical and subtropical countries. Despite its wide...
Ferede, R.
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Maziya-Dixon, B.B.
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Alamu, O.E.
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Asiedu, Robert
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[Identification and quantification of major carotenoids of deep yellow-fleshed yam (tropical Dioscorea dumetorum]
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Identification and quantification of major carotenoids of deep yellow-fleshed yam (tropical Dioscorea dumetorum
International Institute of Tropical Agriculture
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Asiedu, Robert
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Bramel-Cox, P.J.
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Chikoye, D.
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Manyong, Victor M.
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López, K.
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[R4D Review]
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R4D Review
Sixty-day-old plants of white Guinea yam (Dioscorea rotundata), water yam (D. alata) and yellow Guinea yam (D. cayenensis) were exposed to 10 h day lengths (short days) for 15 and 30 days. Short-day treatment applied at the early growth stage of yams promoted the enlargment of tubers, but the res...
Shiwachi, H.
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Ayankanmi, T.G.
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Asiedu, Robert
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[Effect of day length on the development of tubers in yams (Dioscorea spp.)]
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Effect of day length on the development of tubers in yams (Dioscorea spp.)
Twenty-two genotypes of deep yellow fleshed D. dumetorum were analysed for carotenoids using High Performance Liquid Chromatography (HPLC) and for similarities in their provitamin A characteristics using Cluster Analysis (CA). The contribution of each carotenoid to provitamin A content was invest...
Alamu, E.O.
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Maziya-Dixon, B.B.
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Ferede-Menkir, R.
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Popoola, I.
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Asiedu, Robert
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Gondwe, T.N.P.
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[Characterization and classification of the provitamin A carotenoids of deep yellow-fleshed bitter yam (Dioscorea dumetorum) varieties]
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Characterization and classification of the provitamin A carotenoids of deep yellow-fleshed bitter yam (Dioscorea dumetorum) varieties
The responses of 24 white yam (Dioscorea rotundata) cultivars to mechanical and vector transmission with each of three viruses infecting yams were assessed through enzyme-linked immunosorbent assay (ELISA) and symptom development. The viruses were Dioscorea alata virus (DAV), genus Potyvirus; Dio...
Odu, B.O.
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Hughes, J.D.A.
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Asiedu, Robert
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Ng, N.Q.
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Shoyinka, S.A.
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Oladiran, O.A.
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[Responses of white yam (Dioscorea rotundata) cultivars to inoculation with three viruses]
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Responses of white yam (Dioscorea rotundata) cultivars to inoculation with three viruses