Keng, J. C. W., Scott, T. W. and Lugo-López, M. A. (1981) “Fertilizer for Sweet Pepper Under Drip Irrigation in an Oxisol in Northwestern Puerto Rico”, The Journal of Agriculture of the University of Puerto Rico, 65(2), pp. 123–128. doi: 10.46429/jaupr.v65i2.7583.