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Published online 5 April 2007
Published in J Environ Qual 36:773-779 (2007)
DOI: 10.2134/jeq2006.0394
© 2007 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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Influence of Thymol and a Urease Inhibitor on Coliform Bacteria, Odor, Urea, and Methane from a Swine Production Manure Pit

Vincent H. Varel* and James E. Wells

USDA, Agricultural Research Service, U.S. Meat Animal Research Center, P.O. Box 166, Clay Center, NE 68933-0166, USA


Figure 1
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  		Fig. 1. Effect of thymol and N-(n-butyl) thiophosphoric triamide used as amendments in swine manure pits and their effect on volatile fatty acids (VFA) production, urea, and ammonia. (A–D) Thymol addition of 1.5 g L–1 of slurry. (E–H) Addition of 3.0 g L–1 of slurry. Each data point represents the mean ± SE of six samples.

 

Figure 2
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  		Fig. 2. In vitro incubations of thymol and N-(n-butyl) thiophosphoric triamide–amended swine manure pit samples and their effect on total gas, methane, volatile fatty acids (VFA), and pH. (A–D) Thymol addition of 1.5 g L–1 slurry. (E–H) Addition of 3.0 g L–1 of slurry. Each data point represents the mean ± SE of six samples.

 




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