Employment: Professor of Graduate School of Horticulture, Department of Biological Production, Chiba University (1996-present). Vice Dean of Faculty of Horticulture, Chiba University (2003-2007). Deputy Vice President of Chiba University (2006-2007). President of Japanese Society of Soil Science and Plant Nutrition (2017-2019). Education: PhD in Agriculture, The University of Tokyo, Japan in 1984. BS, Faculty of Agriculture, The University of Tokyo. Research interests: 1) Nitrogen and other nutrients in paddy soil. 2) Effects of slow release nitrogen fertilizers on microbial biomass in soil and greenhouse gas emission. 3) Nitrogen fixation and soil rehabilitation in arid soil. 4) Use of stable isotopes and long-term soil fertility.