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Reducing Phosphorus Runoff from Swine Manure with Dietary Phytase and Aluminum Chloride

D. R. Smith*,a, P. A. Moore, Jr.b, C. V. Maxwellc, B. E. Haggardb and T. C. Danield

a USDA-ARS, National Soil Erosion Research Laboratory, Purdue University, 275 South Russell Street, West Lafayette, IN 47907
b USDA-ARS Poultry Production and Product Safety Research Unit, University of Arkansas, Fayetteville, AR 72701
c Department of Animal Science, University of Arkansas, Fayetteville, AR 72701
d Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701



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  		Fig. 1. Effect of AlCl3 treatment and dietary modification on (A) manure total P and (B) manure soluble P (different letters indicate statistical difference at P < 0.05; bars indicate standard error).

 


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  		Fig. 2. Effect of AlCl3 treatment and dietary modification on runoff soluble P (different letters indicate statistical difference at P < 0.05; AlCl3 x phytase interaction, P = 0.05).

 


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  		Fig. 3. Soluble reactive phosphorus (SRP) concentration in composited manure samples used for application to rainfall simulation plots as a function of weighted SRP concentrations from manure samples taken during the in-house trials.

 


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  		Fig. 4. Soluble reactive phosphorus (SRP) concentration in runoff from the first rainfall simulation as a function of manure SRP concentration.

 




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