Vélez-Ramos, Antonio, and Jorge Borges. “Foliar Application of Nitrogen, Potassium and Magnesium, and Pineapple Yield and Quality”. The Journal of Agriculture of the University of Puerto Rico 79, no. 3-4 (July 1, 1995): 111-119. Accessed January 29, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/4306.