Scientists developing strategies for upcoming phosphorus mandates

CHAMPAIGN, Ill. A reality of Illinois agriculture is phosphorus, a consequence of keeping soils fertile to produce food, feed and fiber. University of Illinois researchers say that around the state, levels of soil-test phosphorus range from a low five pounds per acre to an excessively high 1,000 pounds per acre. High levels often are associated with long-term manure or sewage sludge applications. A day of reckoning is coming in the form of a decision by the U.S. Environmental Protection Agency to apply standards on either soluble or total phosphorus, said Robert Hoeft, a professor of soil fertility in the UI department of crop sciences. Hoeft has been leading a state-mandated research effort to understand what is happening with phosphorus and what to do about it.

Unchecked, phosphorus and its fertilizer-based-cousin nitrogen become part of the eutrophication process that leads to the oxygen-choking growth of excess algae a problem the EPA says affects as much as half of U.S. waters. Agriculture and community sanitation systems rank as the biggest suppliers of phosphorus in Illinois.

We have identified the factors that affect the runoff of phosphorus into the environment, and weve identified them in a way so that we can manage them to minimize that runoff into our lakes and streams, Hoeft said. We are confident that when the EPA decides which form of phosphorus it wants us to set standards on, we will have management strategies that will help farmers, if they follow our recommendations, reduce the chances their phosphorus runs off their land.

UI researchers have been working on the issue since the Illinois Livestock Management Act took effect in January 1998. Hoeft detailed the UI effort in October at the annual meeting of the American Society of Agronomy in Charlotte, N.C. He is about to embark on a series of meetings around the state to share their data and potential remedial recommendations with fertilizer and seed dealers.

The UI ex

Contact: Jim Barlow
University of Illinois at Urbana-Champaign

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