1. FAO. 2020. Food and Agriculture Organization of the United Nations. Accessed August 31, 2020. http://www.fao.org/faostat/en/#data.
2. Gerwing, J. A. B., R. Gelderman, R. Berg. 2003. Foliar nutrient application influence on soybean yield at Aurora and Berestord SD in 2003. Plant Sci. 315:65–69. Agricultural experiment station plant science department. South Dakota State University.
3. A Comparison of Three Methods for Reducing Iron‐Deficiency Chlorosis in Soybean