1. Crop Science Laboratory, Faculty of Agriculture; Iwate University; Iwate 020-8550 Japan
2. Crop and Environmental Sciences Division; International Rice Research Institute; Metro Manila Philippines
3. Agro-Meteorology Division; National Institute for Agro-Environmental Sciences; Ibaraki 305-8604 Japan
4. Agro-Environment Division; NARO Tohoku Agricultural Research Center; Iwate 020-0198 Japan
5. Rice Research Division; NARO Institute of Crop Science; Tsukuba 305-8518 Japan
6. Land Farming Division; NARO Hokuriku Agricultural Research Center; Niigata 943-0193 Japan