PESSI, Y. The ash content of the plough layer of peat lands cultivated by different methods. Agricultural and Food Science, [S. l.], v. 33, n. 1, p. 215–222, 1961. DOI: 10.23986/afsci.71554. Disponível em: https://journal.fi/afs/article/view/71554. Acesso em: 8 may. 2024.