NISKANEN, R.; JAAKKOLA, A. Comparison of analytical methods in testing soil fertility . Agricultural and Food Science, [S. l.], v. 57, n. 3, p. 183–194, 1985. DOI: 10.23986/afsci.72200. Disponível em: https://journal.fi/afs/article/view/72200. Acesso em: 25 may. 2024.