Rivera Brenes, L. “Results of Splitting the Application of Nitrogenous Fertilizers to Pangola Grass (Digitaria Decumbens)”. The Journal of Agriculture of the University of Puerto Rico 46, no. 3 (July 1, 1962): 171–174. Accessed April 24, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12331.