Acknowledgements

Discussion in chapter about implication of paddy cultivation and field has been elaborated with communication in the society on paddy field including the International Society of Paddy and Water Environment Engineering (PAWEES). This study is partially supported by the Sosei and Togo Programs of the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT), and the KAKENHI Grant Number JP16H02763 of Japan Society for Promotion of Science (JSPS).
