Mena, H. D., Castillo, J. A. and Marín, J. A. (2013) “Calibration preliminary results of a portable kit for soil chemical analysis”, Revista de Ciencias Agrícolas, 30(1), pp. 79–86. Available at: https://revistas.udenar.edu.co/index.php/rfacia/article/view/971 (Accessed: 26April2024).