Abstract

Abstract Phosphorus loads were estimated for 30 lakes and subwatersheds. Major land uses in the watersheds were cropland and forestland. Annual phosphorus loads varied from 0.42 to 1.19 kg/ha. Watersheds with over 60% cropland had higher phosphorus loading rates than watersheds with more than 40% forestland. Ortho phosphorus concentrations were much lower than total phosphorus concentrations.

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