About WATANABE YOSHIMICHI
About ABE SUSUMU
About Africa Rice Center
About KIKUNO HIDEHIKO
About Int. Ins. Trop. Agric.
About OBALUM Sunday
About OBALUM Sunday
About Univ. Nigeria
About ASIEDU Robert
About Int. Ins. Trop. Agric.
About WAKATSUKI TOSHIYUKI
About 日本土壌肥料学会講演要旨集
About lowland
About paddy field
About fallow land
About soil property
About Federal Republic of Nigeria
About cultivation
About soil organic matter
About surface course
About soil fertility
About land use
About soil profile
About soil survey
About comparative test
About rice crop
About Rice cropping
About Soil survey
About キャンパス
About 低地
About 水田
About 短期
About 休閑地
About 長期
About 土壌