Hernández-Medina, E. 1956. The Use of Chelates to Control Iron Chlorosis in Soybeans Grown in Alkaline Substrate Under Greenhouse Conditions. The Journal of Agriculture of the University of Puerto Rico. 40, 4 (Oct. 1956), 245–254. DOI:https://doi.org/10.46429/jaupr.v40i4.12636.