title: River and groundwater nitrogen contamination caused by livestock production.
abstract: Water quality of rivers in Japanese domestic dairy and pig raising regions, as well as the groundwater in these regions, was investigated. Regarding the method of disposing livestock excreta, interview results from the livestock production farmers and the results of water quality analysis were evaluated. It is concluded that the rivers and the groundwater were contaminated due to inappropriate disposal methods of the livestock excreta. The concentrations of ammonium nitrogen and nitrate nitrogen in the rivers and groundwater were high. The sludge from the bottom of the rivers was also investigated and bacteria which are characteristic of excreta of dairy cattle and pigs were detected. The above pollutants were, therefore, considered to be of livestock origin.
authors.affiliation: Institute of Agricultural and Forest Engineering, University of Tsukuba, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Maekawa
authors.forename: N
authors.initials: N
authors.lastname: Omura
authors.forename: K
authors.initials: K
authors.lastname: Fujita
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Zhang
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: I
authors.initials: I
authors.lastname: Ihara
authors.forename: R
authors.initials: R
authors.lastname: Morioka
mesh_terms: D000818:Animals; D000829:Animals, Domestic; D015169:Colony Count, Microbial; D004784:Environmental Monitoring; D005243:Feces / Q000382:microbiology; D005618:Fresh Water / Q000737:chemistry* / Q000382:microbiology; D007220:Industrial Waste; D007564:Japan; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000009:adverse effects / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D013291:Streptococcus / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods; D014873:Water Pollutants / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000517:prevention & control
chemical_list: D007220:Industrial Waste; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D014873:Water Pollutants; D009584:Nitrogen