Marchi, G., Silva, V. A., Guilherme, L. R. G., Lima, J. M., Nogueira, F. D., & Guimarães, P. T. G. (2012). Potassium extractability from soils of brazilian coffee regions . Bioscience Journal, 28(6), 913–919. Retrieved from https://seer.ufu.br/index.php/biosciencejournal/article/view/13654