Dr. Roland Gbarabe, & Engr Daye O. Barango. (2025). Nitrogen Status of the Soil in the Captain Elechi Amadi Polytechnic Demonstration Farm. ournal of rogress in ngineering and hysical cience, 4(1), 40–43. etrieved from https://www.pioneerpublisher.com/jpeps/article/view/1229