T. M. Agbede,  Effects of Tillage and Oil Palm Bunch Ash Plus Poultry Manure on Soil Chemical Properties, Growth and Ginger Yield.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 481 - 488
    [viewed 19 March 2024]. Available from: https://publications.waset.org/pdf/16279.