In mass spectrometric procedures developed at the University of Illinois for determination of 15N-labeled dinitrogen (N2) and nitrous oxide (N2O) evolved from soils, the assumption is made that the nitrate (NO3) undergoing denitrification exists in a single pool that is isotopically uniform. Computer simulation studies were conducted to identify trends associated with errors in measuring denitrification of NO3- that exists in two or more pools having different enrichments. The results indicate that, for a constant mean 15N enrichment, the magnitude of the error increases as the range of enrichment becomes greater and can increase or decrease with increase in the number of NO3- pools, depending upon whether there is an increase in the range of enrichment. The error is also affected by the extent to which evolution is distributed among the various pools, but it does not depend upon the overall evolution rate or the 15N enrichment of the fertilizer applied.
|Original language||English (US)|
|Number of pages||5|
|Journal||Soil Science Society of America Journal|
|State||Published - Jan 1 1988|
ASJC Scopus subject areas
- Soil Science