The Measurement of Soil Fertility. Indian Forester, [S. l.], v. 60, n. 5, p. 317–320, 1934. DOI: 10.36808/if/1934/v60i5/20647. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/20647. Acesso em: 7 oct. 2025.