About KUWABARA TAKASHI
About 日本獣医生命科大
About agricultural management
About environmental conservation
About cultivation
About site condition
About paddy rice
About preliminary research
About labor force
About winter
About water use
About cropping system
About regional difference
About Niigata prefecture
About Hyogo prefecture
About rice crop
About 地域的条件
About Agricultural engineering
About Rice cropping
About Agricultural economy,agricultural management
About 環境保全
About 稲作
About 地域
About 労働力
About 冬期
About 着目