TALLEYRAND, H.; LUGO-LÓPEZ, M. A. Effect of Five Levels and Three Sources of N on Sweetpotato Yields on an Ultisol. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 60, n. 1, p. 9–14, 1976. DOI: 10.46429/jaupr.v60i1.10580. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/10580. Acesso em: 27 sep. 2022.