Okonkwo, C.    

Firstname:C. 
Surname:Okonkwo 
Email:c.okonkwo@cgiar.org 
Institute:IITA 
Homepage:http://www.iita.org 
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18 publications (0 read)





Publications as Author



2012

Advances in seed yam propagation methods in Nigeria, Ikeorgu, J.*, Mazza, M.*, Okonkwo, C. and Kikuno, H ., in: Tropical Roots and Tuber Crops and the Challenges of Globalization and Climate Changes. Proceedings of the 11th triennial Symposium of the ISTRC-AB, 4 to 8 October 2010, pages 151-154, ISTRC-AB, Ibadan, Nigeria, 2012.
 

2010

Enhancing seed yam supply systems in West Africa, Akoroda, M. O.*, Claudius-Cole, B.*, Kikuno, H ., Okonkwo, C., Aighewi, B. A.*, Acha, I. and Asiedu, R., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 123-136, ISTRC-AB, 2010.
 
Advances in seed yam propagation methods in Nigeria, Ikeorgu, J.*, Mazza, M.*, Okonkwo, C. and Kikuno, H ., Abstract (Poster) in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Varietal response of seven new hybrid yam varieties to minituber production using the microsett technique, Ikeorgu, J.* and Okonkwo, C., in: African Journal of Root and Tuber Crops, volume 8, number 1, pages 62-65, ISSN 1118-2075, 2010.
 
Predicted changes in suitability and agro climatic factors due to climate change for yam production in Nigeria, Sonder, K., Okonkwo, C. and Asiedu, R., in: African Journal of Root and Tuber Crops, volume 8, number 2, pages 51-59, ISSN 1118-2075, 2010.
 
Clean planting materials and management practices for sustained production of yams (Dioscroea spp): the futrue of yam cultivation in West Africa, Okonkwo, C., Asiedu, R. and Akoroda, M. O.*, in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 215-216, ISTRC-AB, 2010.
 
Identifying mega-environment and targeting water yam genotypes for production in west Africa, Okonkwo, C., Okechukwu, R. and Asiedu, R., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 360, ISTRC-AB, 2010.
 

2009

Perception of food quality in yams among Nigerian farmers, Otegbayo, B.*, kehinde, A. L.*, Sangoyomi, T.*, Samuel, F. O.* and Okonkwo, C., in: Securing livelihoods through yams: Proceedings of a technical workshop on progress in yam research for development in west and central Africa held in Accra, Ghana, 11-13 September, 2007, pages 147-156, International Institute of Tropical Agriculture (IITA), 2009.
 

2006

Iron toxicity symptoms in yams (Dioscorea spp.) grown in water culture, Shiwachi, H ., Kikuno, H ., Okonkwo, C. and Asiedu, R., in: Tropical Science, volume 46, number 3, pages 160-165, ISSN 0041-3291, 2006. [DOI]
 
Stability studies of hybrid yam (Dioscorea rotundata Poir.) genotypes in Ghana, Otoo, E.*, Okonkwo, C. and Asiedu, R., in: Journal of Food, Agriculture and Environment, volume 4, number 1, pages 234-238, ISSN 1459-0255, 2006.
 

2004

Nutrient deficiency symptoms in yams (Dioscorea spp.), Shiwachi, H ., Okonkwo, C. and Asiedu, R., in: Japanese Journal of Tropical Agriculture, volume 48, number 2, pages 73-74, 2004.
 
Archiving root and tuber research data. The small processor and development of local food industries for market economy, Okechukwu, R., Okonkwo, C., Quin, F., Asiedu, R. and Dixon, A., in: The small processor and development of local food industries for market economy, pages 376-379, International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 2004.
 
Water yam (Dioscorea alata), a neglected crop with high potential in West Africa, Okonkwo, C., Adeniji, M. and Asiedu, R., in: 9th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
Assessing food quality in farmer participatory varietal selection of Water Yam (Dioscorea alata L.), Okonkwo, C., Dossou, R.*, Zoupoya, K., N'kpenu, E., Otoo, E.*, Alhassan, A. Y., Echekwu, C. A. and Asiedu, R., in: 9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
Farmer participatory clonal selection of Water Yam (Dioscorea alata) in West Africa, Okonkwo, C., Dossou, R.*, Zoupoya, K., N'kpenu, E., Otoo, E.*, Alhassan, A. Y., Echekwu, C. A. and Asiedu, R., in: 9th Triennial Symposium of the Internaitonal Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 

2003

Archiving root and tuber research data, Okechukwu, R., Okonkwo, C., Quin, F., Asiedu, R. and Dixon, A., in: Root crops: the small processor and development of local food industries for market economy: proceeding of the Eighth Triennial Syposium of the International Society for Tropical Root Crops - Africa Branch (ISTRC-AB), 12-16 November 2001, Ibadan, Nigeria, pages 376-379, 2003.
 

1996

The effect of nitrogen on the growth and development of giant witchweed, Striga hermonthica Benth: effect on cultured germinated seedlings in host absence, Igbinosa, I., Cardwell, K. and Okonkwo, C., in: European Journal of Plant Pathology, volume 102, pages 77-86, 1996.
 

1991

Effects of Gliricidia sepium (Jacq) Steud and Leucaena leucocephala (Lam.) de Wit on growth and develoment of Imperata cylindrica (L.) Reuschel, Anoka, U.A., Akobundu, I. and Okonkwo, C., in: Agroforestry Systems, volume 16, number 1, pages 1-12, 1991.