Abruña, Fernando, José Rodríguez, José Badillo-Feliciano, Servando Silva, and José Vicente-Chandler. 1978. “Crop Response to Soil Acidity Factors in Ultisols and Oxisols in Puerto Rico-Soybeans”. The Journal of Agriculture of the University of Puerto Rico 62 (1):90-112. https://doi.org/10.46429/jaupr.v62i1.10401.