JOMHATAIKOOL, B.; FAUNGNAWAKIJ, K. .; KUBOON, S.; KRAITHONG, W.; CHUTIPAICHIT, S.; FUJI, M. .; EIAD-UA, A. Effect of humic acid extracted from Thailand’s leonardite on rice growth. Journal of Metals, Materials and Minerals, Bangkok, Thailand, v. 29, n. 1, 2019. Disponível em: https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/400. Acesso em: 24 jun. 2024.