Abruña, F., Rodríguez, J., & Silva, S. (1983). Crop Response to Soil Acidity Factors in Ultisols and Oxisols in Puerto Rico. VI. Grain Sorghum. The Journal of Agriculture of the University of Puerto Rico, 67(1), 28–38. https://doi.org/10.46429/jaupr.v67i1.7688