About HAMADA KOJI
About SHIRATANI EISAKU
About HITOMI TADAYOSHI
About 農業農村工学会誌
About agricultural water
About treated sewage
About reuse of water
About irrigation water
About irrigation
About dry field
About risk management
About International Organization for Standardization
About international standard
About field irrigation
About Agricultural engineering
About Water resources
About Water pollution in general
About 再生水
About 農業
About 動向
About 現状
About 規格化
About 動き