MARTÍNEZ, M. B.; LUGO-LÓPEZ, M. A. Tillage tests: II, the beneficial effect of subsoil fertilization on sugarcane yields. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 37, n. 1, p. 35–43, 1953. DOI: 10.46429/jaupr.v37i1.12775. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/12775. Acesso em: 28 sep. 2022.