Carter, S.E., L.O. Fresco, P .G. Jones and IN. Fairbairn. An Atlas of Cassava in Africa: Historical, Agroecological and Demographic Aspects of Crop Distribution . CIAT, Cali, Colombia. Dixon, A.G.O., R. Asiedu, U . Ekanayake, and M.C.M. Porto, 1994. Cassava improvement in Africa: Contribution of the International Institute of Tropical Agriculture. pp. 466-469. In. E. Adipala, M.A. Bekunda, I.S. Tenywa, M.W. Ogenga-Latigo, and J. ~. Mugah (eds.). African Crop Science Conference Proc. Vol. 1, Kampala, Uganda. Ene, L.S.O. 1992. Prospects for processing and utilization of root and tuber crops in Africa. pp. 7-16. In M.O. Akoroda and O.B. Arene (eds.). Tropical Root Crops : Promotion of Root Crop-based Industries, ISTRC~AB, I1TA, Nigeria. Fagbami, A. 1985. The application of the Gebgraphic Information Systems (GIS) to esource development and land management:路 the Nigerian example. pp. 319-331. In R.A. obulo and E.1. Udo (eds .). Soil Fertility, Soil Tilth and Post Clearing Land Degradation n the Humid Tropics . Proceedings of the International Society of Soil Science (Commission IV and VI).
~
FAO. 1978. Report on the agro-ecological zones project. Vol. 1. Methodology and Results for Africa. World Soil Resources Report 48. FAO, R.ome, Italy. Ekanayake, 1.1.. This pufication. Agro-climatological aspects that are important to classify cassava environments for better adaptation and maximized production. in press. Ekanayake. 1.1., A.G.O. Dixon and M.C.M. Porto. 1996. Performance ofvanous cassava clones in the dry savanna region of Nigeria. pp. 207-215. In Tropical Tuber Crops, Problems, Prospects and Future Strategies. G.T. Kurup, M.S. Palaniswamy, V.R. Potty, G. Padmaja, S. Kabeerathatnrna and S.V. pillai (eds.). Oxford & IBH Pub. Co., New Delhi, India. Gbadegesin, S. and o. Areola. 1987. Soil factors affecting maize yields路 in the southwestern Nigerian savarma and their relation to soil suitability assessment. Soil survey and land evaluation 7(3): 167-175. Jensen, N.F. 1988. Plant Breeding Methodology. pp. 583-631. John Wiley & Sons, New York, USA. Jones, H.G. and J.E. Corlett. 1992. Current topics in drought physiology (review). Journal of Agricultural Science, Cambridge 119: 291-296. Kay, J.J. 1993. On the nature of ecological integrity: some closing comments. In S. Woodley, J.1. Kay and G. Francis (eds.). Ecological Integrity and the Management of Ecosystems. St. Lucie Press, USA. Lin, C.S. and M.R. Binns. 1988. A method of analyzing cultivar x location x year experiments: a new stability parameter. Theoretical and Applied Genetics 76: 425-430. Papadakis, 1. 1965. Crop ecology survey in West Africa (Liberia, Ivory Coast, Ghana, Togo, Dahomey, Nigeria). FAO, Rome, Italy. Vol. II - Atlas (map 23). Porto, M ., R. Asiedu, A. Dixon, and S.K. Hahn. 1994. An agroecologically oriented introduction of cassava gennplasm from Latin America into Africa. pp. 118-129. In. F. Ofori and S.K. Hahn. (cds.). Tropical Root Crops in a Developing Economy, Proceedings of the Ninth ISTRe. 20-26 October 1991, Accra, Ghana.
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