WERASOPON, O. Use of Organic Materials for Upland Soil Improvement. Thai Agricultural Research Journal, [S. l.], v. 9, n. 1, p. 47–54, 1991. Disponível em: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/242209. Acesso em: 1 oct. 2026.