||Relationships of Phosphorus and Nitrogen to the Trophic State of Northeast and North-Central Lakes and Reservoirs.
||Pacific Northwest Environmental Research Lab., Corvallis, Oreg.;National Environmental Research Center, Las Vegas, Nev.
Water pollution ;
Inorganic phosphates ;
Inorganic nitrates ;
Water quality ;
Correlation techniques ;
Northeastern Region(United States) ;
North Central Region(United States) ;
Trophic level ;
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Data collected by the National Eutrophication Survey during 1972-73 from lakes and reservoirs in ten northeast and north-central states are presented. Relationships between total phosphorus concentrations and chlorophyll a, total phosphorus concentrations and secchi disc depth, total phsophorus concentrations and algal assay control yields ae developed. Total annual phosphorus and nitrogen loadings to lakes are related to their trophic condition. Water quality criteria for phosphorus and nitrogen and also discussed.