About MIYAZATO NAOKI
About TAKASE AKIHIKO
About MORITA TETSUO
About AOI TOORU
About 環境システム研究論文集
About Gunma prefecture
About river
About paddy field
About rainfall
About weir
About nitrogen form
About concentration(ratio)
About seasonal variation
About irrigation water
About water quality test
About numerical value
About reduction
About elimination quantity
About inorganic nitrogen
About Tonegawa River
About Water quality research and measurement in general
About Nitrogen and its compounds
About Wastewater treatment of agricultural wastes
About 無機態窒素
About 濃度変動
About 水田