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Published online 25 August 2005
Published in Soil Sci Soc Am J 69:1639-1643 (2005)
DOI: 10.2136/sssaj2004.0364
© 2005 Soil Science Society of America
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Production of Nitrogen-15-Labeled Pig Manure for Nitrogen Cycling Studies

Peter Sørensen* and Ingrid K. Thomsen

Danish Institute of Agricultural Sciences, Dep. of Agroecology, P.O. Box 50, Reseach Centre Foulum, 8830 Tjele, Denmark



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  		Fig. 1. The 15N content of pig feces and urine excreted by Pig 1 during 11 d of feeding with a 15N-enriched diet.

 


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  		Fig. 2. Nitrogen-15 enrichment of ammonium N formed during decomposition of pig feces in quartz sand. The feces were sampled on Days 3, 5, and 11 after the start of 15N-feeding. Bars indicate standard errors (n = 3), NS = not significant (p < 0.05).

 


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  		Fig. 3. Inorganic soil N derived from feces as estimated either by the 15N technique or the difference method, after incubation of 15N-labeled pig feces (Pig 1) in a sandy soil for 32 wk. The feces were sampled on Days 5 and 11 after the start of 15N-feeding. Bars indicate standard errors (n = 3).

 


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  		Fig. 4. Relationship between inorganic soil N derived from feces as estimated either by the 15N technique or the difference method, after incubation of 15N-labeled pig feces in a sandy soil for 32 wk. The feces were sampled on Days 5 and 11 after start of 15N-feeding (see Fig. 3).

 




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