Irizarry, Héber, et al. “Nutrient Uptake and Dry Matter Yield in the ’Gunung‘ Yam (Dioscorea Alata) Grown on an Ultisol Without Vine Support”. The Journal of Agriculture of the University of Puerto Rico, vol. 79, no. 3-4, Mar. 2022, pp. 121-30, doi:10.46429/jaupr.v79i3-4.4307.