Iren, Otobong B., et al. “Response of <I>Amaranthus cruentus< I> To Biochar Combined With Urea Fertilizer in Calabar, Nigeria”. Journal Of Agriculture, Forestry & Environment , vol. 3, no. 1, Dec. 2018, pp. 192-03, https://jafe.net.ng/index.php/home/article/view/31.