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Published online 7 November 2005
Published in J Environ Qual 34:2318-2327 (2005)
DOI: 10.2134/jeq2005.0090
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chemical and Physical Changes Following Co-Composting of Beef Cattle Feedlot Manure with Phosphogypsum

Francis Zvomuyaa, Francis J. Larneya,*, Connie K. Nicholb, Andrew F. Olsona, Jim J. Millera and Paul R. DeMaerea

a Agriculture and Agri-Food Canada, Research Centre, 5403 First Avenue South, Lethbridge, Alberta, Canada T1J 4B1
b Agrium Inc., 11751 River Road, Fort Saskatchewan, Alberta, Canada T8L 4J1



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  		Fig. 1. Effect of bedding type and phosphogypsum (PG) rate on water content of manure–phosphogypsum mixtures at the start of composting. Vertical bars represent standard errors.

 


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  		Fig. 2. Effect of bedding type and phosphogypsum (PG) rate on total N content of manure–phosphogypsum mixtures at the start of composting. Vertical bars represent standard errors.

 


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  		Fig. 3. Effect of bedding type and phosphogypsum (PG) rate on available sulfur (SO4–S) concentration of co-composts after 99 d of composting.

 


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  		Fig. 4. Effect of bedding type and phosphogypsum (PG) rate on pH of co-composts after 99 d of composting. Vertical bars represent standard errors.

 


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  		Fig. 5. Effect of bedding type and phosphogypsum (PG) rate on water mass loss (% of initial) during co-composting. Vertical bars represent standard errors.

 




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The SCI Journals Agronomy Journal Crop Science
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Copyright © 2005 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.