About KARASAWA TOSHIHIKO
About 農業・食品産業技術総合研究機構 中央農業研究セ
About organic farming
About organic fertilizer
About soil microorganism
About biological activity
About microbial mineralization
About Nitrogen
About field (agriculture)
About organic soil
About fertilizer effect
About vegetable
About cultivation
About conventional cultivation
About nitrogen mineralization
About soil microbial activity
About vegetable growing
About Fertilizer application and efficiency
About 野菜
About 畑土壌
About 有機物
About 肥料