1. The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Japan
2. Faculty of Agriculture, Stiper Agricultural University, Yogyakarta, Indonesia
3. College of Tropical Crops, Hainan University, Haikou, China
4. Faculty of Agriculture, Yamagata University, Tsuruoka, Japan
5. Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, China
6. Japan International Research Center for Agricultural Sciences, Tsukuba, Japan
7. Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan