Abruña, F., Rodríguez, J., Badillo-Feliciano, J., Silva, S., & Vicente-Chandler, J. (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