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Agbede, T. , Adekiya, A.. "Effect of Cocoa Pod Ash and Poultry Manure on Soil Properties and Cocoyam Productivity of Nutrient-Depleted Tropical Alfisol". World Academy of Science, Engineering and Technology, Open Science Index 111, International Journal of Agricultural and Biosystems Engineering (2016), 10(3), 172 - 179.