SAARELA, I. Phosphorus in Finnish soils in the 1900s with particular reference to the acid ammonium acetate soil test. Agricultural and Food Science, [S. l.], v. 11, n. 4, p. 257–271, 2002. DOI: 10.23986/afsci.5729. Disponível em: https://journal.fi/afs/article/view/5729. Acesso em: 4 may. 2024.