1. Laboratory of Plant Nutrition, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University
2. Laboratory of Plant Nutrition, Division of Soil Science and Plant production, Department of Plant Resources, Faculty of Agriculture, Kyushu University
3. Laboratory of Plant Nutrition, School of Agriculture, Kyushu University
4. Department of biochemistry and Applied Biosciences, Faculty of Agriculture, Miyazaki University