WATER RESOURCES RESEARCH GRANT PROPOSAL
WATER RESOURCES RESEARCH GRANT PROPOSAL
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
Abstract
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.