Reducing phosphorus runoff from swine manure with dietary phytase and aluminum chloride

Journal of Environmental Quality
D R SmithT C Daniel

Abstract

Phosphorus (P) runoff from fields fertilized with swine (Sus scrofa) manure has been implicated in eutrophication. Dietary modification and manure amendments have been identified as best management practices to reduce P runoff from manure. This study was conducted to compare the effects of dietary modification and aluminum chloride (AlCl3) manure amendments on reducing P in swine manure and runoff. Twenty-four pens of nursery swine were fed either a normal diet or a phytase-amended diet. Each pen was connected to a separate manure pit, which was treated with AlCl3 to give final concentrations in the liquid manure of 0 (control), 0.25, 0.50, or 0.75% (v/v). Manure was collected and applied to plots cropped with tall fescue (Festuca arundinacea Schreb.), and simulated rainfall was applied at 50 mm h(-1), sufficient to generate a minimum of 30 min of continuous runoff. Samples of manure and runoff were analyzed for P and Al concentrations. Phytase reduced manure soluble reactive phosphorus (SRP) by 17%, while AlCl3 reduced manure SRP by as much as 73% compared with normal manure. Phosphorus runoff was reduced from 5.7 to 2.6 mg P L(-1) (a 53% reduction) using AlCl3. The mean SRP concentration in runoff from phytase diets without A...Continue Reading

Citations

Mar 26, 2013·Environmental Science and Pollution Research International·Cornelius J O' FlynnOwen Fenton
Aug 11, 2015·The Science of the Total Environment·Thiago Augusto FormentiniEmmanuel Doelsch
Feb 22, 2011·Chemosphere·Sangwon Suh, Scott Yee
Jul 16, 2013·Journal of Environmental Management·Cornelius J O' FlynnOwen Fenton
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Jun 2, 2006·Journal of Environmental Quality·P A Vadas, P J A Kleinman
Mar 3, 2006·Journal of Environmental Quality·Douglas R SmithC Huang
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Jan 9, 2021·Journal of Environmental Management·Luciano Colpo GatiboniDalton Belchior Abdala
Nov 29, 2008·Poultry Science·T ApplegateR Angel

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