WASET
    T. M. Agbede and  A. O. Adekiya,  Effect of Cocoa Pod Ash and Poultry Manure on Soil Properties and Cocoyam Productivity of Nutrient-Depleted Tropical Alfisol.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2016, vol. 111(3). 172 - 179
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10003963.