DALE RITCHEY, K.; FOX, Richard H. Limitations to Productivity of Some Ultisol and Oxisol Subsoils. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 58, n. 2, p. 197–210, 1974. DOI: 10.46429/jaupr.v58i2.10678. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/10678. Acesso em: 4 may. 2024.