NISKANEN, R. Extractable aluminium, iron and manganese in mineral soils: I Dependence of extractability on the pH of oxalate, pyrophosphate and EDTA extractants. Agricultural and Food Science, [S. l.], v. 61, n. 2, p. 73–78, 1989. DOI: 10.23986/afsci.72355. Disponível em: https://journal.fi/afs/article/view/72355. Acesso em: 20 jul. 2024.