KAMPRATH, Eugene J. et al. Relevance Of Soil Testing To Agriculture And The Environment. Council for Agricultural Science and Technology (CAST), Ames, U.S.A., 2000. DOI: 10.62300/q6wd7414. Disponível em: https://publications.cast-science.org/CAST/article/view/192. Acesso em: 1 jul. 2026.