UKOM, A.N.; OJIMELUKWE, P.C.; OKPARA, D.A. Nutrient Composition of Selected Sweet Potato [Ipomea batatas (L) Lam] Varieties as Influenced by Different Levels of Nitrogen Fertilizer Application. Pakistan Journal of Nutrition, Pakistan, v. 8, n. 11, p. 1791–1795, 2009. DOI: 10.3923/pjn.2009.1791.1795. Disponível em: https://pjnonline.org/pjn/article/view/1085. Acesso em: 4 sep. 2025.