Iren, Otobong B., Ime D. Uwah, and Mmadara I. Umanah. 2018. “Response of <I>Amaranthus cruentus< I> To Biochar Combined With Urea Fertilizer in Calabar, Nigeria”. Journal Of Agriculture, Forestry & Environment 3 (1): 192-203. https://jafe.net.ng/index.php/home/article/view/31.