“Effects of Anaerobically Digested and Undigested Poultry Manure on the Growth and Yield of Maize (Zea Mays, L)”. International Journal of Manures and Fertilizers 1, no. 1 (May 27, 2012): 232–239. Accessed April 5, 2026. https://www.ijpp.org/journal/index.php/ijmf/article/view/259.