About SAITO MASANORI
About 秋田県農試
About KATO MASAYA
About 秋田県 東京事務所
About SHINDO HAYATO
About 秋田県 農林水産部
About SAYAMA AKIRA
About 秋田県農試
About 東北農業研究
About tractor
About automatic operative method
About tillage
About operation performance
About cultivation control machine and tool
About plowing
About Machines for field operations
About トラクタ
About 耕起作業
About 作業能率