Badillo-Feliciano, J., Lugo-López, M. A. and Scott, T. W. (1979) “Influence of Cultivars, N levels and Time of N Application on Plant Characters, leaf Composition, and Yield of Corn Grown on an Oxisol”, The Journal of Agriculture of the University of Puerto Rico, 63(3), pp. 273–280. doi: 10.46429/jaupr.v63i3.10285.