About HOU Caozhengyang
About NAKAYAMA YASUNORI
About OYAGI HIDEO
About TAKEUCHI SHINJI
About 日本大学文理学部自然科学研究所研究紀要
About Shizuoka prefecture
About land use
About drainage basin
About tea garden
About paddy field
About region
About isotopic ratio
About nitrogen isotope
About stable isotope
About nitrate nitrogen
About fertilization(cultivation)
About ammonium sulfate
About water pollution
About river pollution
About domestic sewage
About anion
About nitrate
About pH
About nitrate ion
About paddy region
About nitrogen stable isotope ratio
About River pollution
About 静岡
About 流域
About 窒素安定同位体比
About 土地利用