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Study shows eutrophic lakes may not recover for a millennium

tation of chemical phosphorus to watersheds and limiting feed for cattle and other farm animals to feed that is grown in the watershed. At present, a significant amount of feed for farm animals is imported into the Lake Mendota watershed.

Last year, the City of Madison implemented a ban on chemical phosphorus for lawn products, but farmers still apply phosphorus fertilizers, even when soils have a reservoir of the nutrient.

The biggest help, Carpenter says, would come from reducing soil erosion rates. However, developing larger buffers around lakes and streams, restoring wetlands and encouraging the use of new manure storage and handling processes are also steps that can be taken to reduce phosphorus runoff.

"Anything we can do to reduce the erosion of phosphorus is going to be beneficial," Carpenter says.


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Source:University of Wisconsin-Madison


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