Rivera, Edmundo, Fernando Abruña, and José Rodríguez. “Crop Response to Soil Acidity Factors in Ultisols and Oxisols in Puerto Rico X1. Cassava”. The Journal of Agriculture of the University of Puerto Rico 69, no. 2 (April 1, 1985): 145–151. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7337.