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U. A., Essien,, Department of Agricultural Economics, Federal University of Technology Owerri, Imo State, Nigeria.
Uckun, Ayca Akca, Republic of Turkey Ministry of Agriculture and Forestry, Olive Research Institute, Cultivation Techniques, Bornova, İzmir, Turkey.
Uwakwe, Augustine A, Department of Biochemistry, Faculty of Science, University of Port Harcourt, Nigeria.
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