Takuji Ohyama is the chairman of the Fertilization Research Foundation. He obtained a Ph.D. in Agriculture from the University of Tokyo in 1980. His previous positions include professor in the Faculty of Agriculture, Dean of the Graduate School of Science and Technology, and dean of the Faculty of Agriculture, all at Niigata University, Japan. He was also a Professor in the Faculty of Applied Biosciences, Department of Agricultural Chemistry, Tokyo University of Agriculture (2017 -2022). He was president of the Japanese Society of Soil Science and Plant Nutrition from 2007–2009. His research interests are nitrogen fixation and metabolism in soybean plants, new technology of deep placement of slow-release nitrogen fertilizers for soybean cultivation, and nitrogen and carbon metabolism in rice, tulip, curcuma, and cucumber. He is also interested in the use of stable isotopes and positron-emitting radioisotopes.