Okhumata, Dania Stephen, and Oshidi Ayodele Francis. “Comparative Effects of Sawdust-Piggery Compost and NPK on the Growth and Yield of Maize in a Degraded Ultisol”. The International Journal of Business & Management 7, no. 9 (September 30, 2019). Accessed May 18, 2024. http://www.internationaljournalcorner.com/index.php/theijbm/article/view/147881.