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Journal of Environmental Quality Abstract -

Nitrogen Tracers in Nitrogen Cycle Studies—Past Use and Future Needs1

 

This article in JEQ

  1. Vol. 2 No. 3, p. 317-327
     
    Received: July 7, 1972


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doi:10.2134/jeq1973.00472425000200030001x
  1. Roland D. Hauck2

Abstract

Abstract

Nitrogen research is directed toward two main objectives, food and fiber production and environmental control. To achieve N balance in productive ecosystems, better quantitative estimates of N transformation rates are needed. Nitrogen tracers are indispensable for making many of these estimates. Either 15N-depleted or 15N-enriched materials can be used. The use of 15N-depleted materials is limited to studies where dilution form other N is less than 2,000-fold, but these materials are potentially available in ton amounts.

Use of variation in natural 15N abundance may be useful in observing qualitative relationships among N cycle processes over large areas or extremely long time periods. Such use is questionable for obtaining quantitative information for short-term N transformation processes.

Obvious information gaps are quantitative data on atmospheric N2 fixation and denitrification in cropped field soils and N transformation data for many other ecosystems. A program for computer data retrieval and correlation is outlined.

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