CHAIROJ, P. Nitrogen Status of Upland Soils. Thai Agricultural Research Journal, [S. l.], v. 13, n. 1, p. 43–52, 1995. DOI: 10.14456/thaidoa-agres.1995.5. Disponível em: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/238334. Acesso em: 1 oct. 2026.