About ODASHIMA MERI
About 岩手県農業研究セ
About TAKAHASHI YOSHINORI
About 岩手県農業研究セ
About 東北農業研究
About rice straw
About tillage
About paddy soil
About potassium
About time course
About organic fertilization
About stage(period)
About exchangeable potassium
About cropping period
About plowing-in
About paddy soil
About Rice cropping
About Fertilizer application and efficiency
About Soil fertility
About 稲わら
About 秋
About 水田土壌
About 含量
About 経時変化