YAMIN, Muhammad; ISMAIL, Wan Ishak bin Wan; KASSIM, Muhamad Saufi bin Mohd; AZIZ, Samsuzana Binti Abd; AKBAR, Farah Naz; SHAMSHIRI, Redmond R.; IBRAHIM, Muhammad; MAHNS, Benjamin. Modification of colorimetric method based digital soil test kit for determination of macronutrients in oil palm plantation. International Journal of Agricultural and Biological Engineering, Beijing, China, v. 13, n. 4, p. 188–197, 2020. Disponível em: https://ijabe.org/index.php/ijabe/article/view/5694. Acesso em: 23 feb. 2026.