About IWASA IKUO
About 宮城県石巻地方振興事務所
About SUGAWARA TSUYOSHI
About 宮城県古川農試
About CHIDA TOMOYUKI
About 宮城県登米地方振興事務所
About 農業農村工学会誌
About paddy field
About farm land consolidation
About dry field
About underdrain
About rice hull
About hydrophobic
About humus
About crash recovery
About material
About 疎水材
About Agricultural engineering
About 暗渠
About もみ殻
About 疎水材
About 開削
About 充填機
About 考案