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a 275 South Russell Street, West Lafayette, IN 47907
b 115 Plant Science, University of Arkansas, Fayetteville, AR 72701
c 203 Engineering Hall, University of Arkansas, Fayetteville, AR 72701
d Waste Management and Forage Research Unit, USDA-ARS, PO Box 5367, Mississippi State, MS 39762-5367
* Corresponding author (drsmith{at}purdue.edu)
Received for publication December 15, 2003. Phosphorus (P) losses from pastures fertilized with poultry litter contribute to the degradation of surface water quality in the United States. Dietary modification and manure amendments may reduce potential P runoff losses from pastures. In the current study, broilers were fed a normal diet, phytase diet, high available phosphorus (HAP) corn diet, or HAP corn + phytase diet. Litter treatments were untreated control and alum added at 10% by weight between flocks. Phytase and HAP corn diets reduced litter dissolved P content in poultry litter by 10 and 35%, respectively, compared with the normal diet (789 mg P kg–1). Alum treatment of poultry litter reduced the amount of dissolved P by 47%, while a 74% reduction was noted after alum treatment of litter from the HAP corn + phytase diet. The P concentrations in runoff water were highest from plots receiving poultry litter from the normal diet, whereas plots receiving poultry litter from phytase and HAP corn diets had reduced P concentrations. The addition of alum to the various poultry litters reduced P runoff by 52 to 69%; the greatest reduction occurred when alum was used in conjunction with HAP corn and phytase. This study demonstrates the potential added benefits of using dietary modification in conjunction with manure amendments in poultry operations. Integrators and producers should consider the use of phytase, HAP corn, and alum to reduce potential P losses associated with poultry litter application to pastures.
Abbreviations: DRP, dissolved reactive phosphorus • HAP, high available phosphorus
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