Abstract
Phosphorus (P) runoff from agricultural lands fertilized with swine manure can be a significant environmental issue. The objectives of this study were to evaluate the effect of aluminum chloride (AlCl3) applications to a swine lagoon during total clean out on P concentrations in manure and runoff water. There were four treatments: 1) untreated manure; 2) manure treated with AlCl3 in-situ; 3) manure treated with AlCl3 post collection; and 4) manure treated with AlCl3 plus lime post collection. Manure applications were equivalent to 112 kg P ha-1. Rainfall simulators were used to provide a 5-cm h-1 storm event 1, 8, 15, 17, and 24 days after application. All AlCl3 amendments significantly reduced manure soluble reactive P (SRP) concentrations. The AlCl3/lime treatment was the most effective, reducing manure SRP concentrations by 69% compared to the untreated manure. In runoff water, SRP loads were significantly higher from plots fertilized with the untreated manure. Cumulative SRP loads were 30% lower from plots fertilized with manure treated with AlCl3 in-situ than the untreated manure. Cumulative P losses increased as SRP application rates increased. Treatment of manure with AlCl3 in-situ can significantly decrease manure SRP concentrations and subsequently reduce P loss from fields receiving manure applications.
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