suliman, ashwag, Howida T. Jepreel, Tagelsir I. M. Idris, Mohamed Osman A. Warrag, and Fakhereldin Awad. Hussien. 2018. “Response of Periwinkle (Catharanthus Roseus) to Urea Applications”. IJRDO-Journal of Agriculture and Research (ISSN: 2455-7668) 4 (10), 01-06. https://doi.org/10.53555/ar.v4i10.2454.