Abubakar, Abdulhalim Musa, Yusufu Luka, Suleiman Abdullahi, Prem Baboo, and Semiu Adebayo Kareem. 2024. “NPK Biofertilizer Production from Banana Peel, Feather and Bone Ashes and Their Comparative Advantage to 20:10:10 Inorganic Fertilizer”. Science, Engineering and Technology 4 (1): 68-79. https://doi.org/10.54327/set2024/v4.i1.118.