Rice fields used in the sanitation of waste waters.
D001419:Bacteria / Q000302:isolation & purification; D005374:Filtration; D006376:Helminths / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D012275:Oryza; D010100:Oxygen; D010933:Plankton; D012722:Sewage; D013696:Temperature; D014586:USSR; D014867:Water / Q000032:analysis; D014871:Water Microbiology; D014876:Water Pollution / Q000517:prevention & control*
D012722:Sewage; D014867:Water; D010100:Oxygen