Tokyo University of Agriculture and Technology;
Tokyo (Japan);
Institute of Soil Science;
Chinese Academy of Sciences;
Nanjing;
210008 (China);
Hokkaido University;
Sapporo (Japan);
Akita Prefectural University;
Akita (Japan);
National Institute for Agro-Environmental Sciences;
Tsukuba (Japan);
Kitasato University;
Towada (Japan);
Tohoku University;
Osaki (Japan);