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Project ID: 2002SD4B

Title: Establishing a Relationship Between Soil Test P and Runoff P for a South Dakota Soil Using Simulated Rainfall

Project Type: Research

Focus Categories: Agriculture, Nutrients, Water Quality

Keywords: Soil Test Phosphorus, P Saturation, P Runoff, Eutrophication, Livestock

Start Date: 03/01/2002

End Date: 02/28/2003

Federal Funds: $18,689

Non-Federal Matching Funds: $37,444

Congressional District: First

Principal Investigators:
Frank V. Schindler
South Dakota State University

Ronald H. Gelderman
South Dakota State University

David R. German
South Dakota State University


Current South Dakota regulations base land applications of manure on nitrogen (N) needs of the crop, with no consideration given to crop phosphorus (P) requirements. This practice can result in P additions to soil well above what is required by the plant to achieve maximum dry matter yield. There is a need to better understand phosphorous (P) loss in runoff as affected by land applications of livestock manure. The result of over application of P is increased soil test P (STP) levels and research supports a direct correlation between STP and runoff P. Increased runoff P results in nutrient loading and possible water resource eutrophication. Soil test phosphorus and runoff P correlations have not been evaluated for South Dakota soils receiving manure from the major livestock enterprises of the region (i.e., beef, dairy and swine). The objectives of the proposed research are: 1) Establish laboratory and field correlations among STP, runoff P, and P saturation for the Brookings soils, and 2) use the research results to educate area animal producers and extension educators on improved manure management. Certain soils have a greater capacity to hold added P and thus would be better suited for the larger feedlot operations. This research will provide answers as to which soil has a higher holding capacity for P and to what extent. This will help livestock producers and various environmental stakeholders identify suitable feedlot areas in South Dakota.

Progress/Completion Report PDF

U.S. Department of the Interior, U.S. Geological Survey
Maintained by: John Schefter
Last Updated: Thursday June 24, 2004 3:18 PM
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