Submitted to: American Society of Agronomy Branch Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 1/15/1999
Publication Date: N/A
Technical Abstract: Research has shown that the application of swine manure based on plant nitrogen requirements can result in excess phosphorus (P) in runoff waters. Aluminum sulfate (alum) treatment of poultry litter has been shown to reduce P concentrations in runoff waters. The objectives of this study are to determine the effects of alum and aluminum chloride on P concentrations in runoff and measure tall fescue (Festuca arundinacea Shreb.) yields on plots fertilized with liquid swine manure alone and swine manure amended with alum or aluminum chloride. A rainfall simulation was conducted on fescue plots that had received the following treatments: 1) control (no manure); 2) swine manure amended with a high alum rate (0.43g Al/L manure); 3) swine manure amended with a high aluminum chloride rate (0.43 g Al/L manure); 4) swine manure amended with a low alum rate (0.215 g Al/L manure); 5) swine manure amended with a low aluminum chloride rate (0.215 g Al/L manure); and (6) untreated swine manure. The manure was broadcast applied for a target application of 27.58 kg ha**-1 (104,000 L ha**-1). Runoff water was collected during the rainfall simulation and analyzed for soluble reactive phosphorus (SRP); which were as follows: 0.57, 0.91, 0.91, 3.12, 3.81, and 5.72 mg L**-1, respectively for treatments 1-6. The results showed a reduction in P concentrations from the treatments utilizing the chemical amendments.