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Soil Science Society of America Journal Abstract -

A Semiautomated Procedure for Total Nitrogen in Plant and Soil Samples1

 

This article in SSSAJ

  1. Vol. 40 No. 6, p. 887-889
     
    Received: Mar 31, 1976
    Accepted: Aug 25, 1976


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doi:10.2136/sssaj1976.03615995004000060026x
  1. R. N. Gallaher,
  2. C. O. Weldon and
  3. F. C. Boswell2

Abstract

Abstract

This study evaluated inexpensive alternatives for the determination of total N in plant and soil samples. Plant and soil samples which varied widely in N concentration were digested in a 126-sample-capacity Al block digester followed by determination of total N with the ammonium electrode in a semiautomated reaction vessel assembly. The proposed Ammonium electrode semiautomated (AES) procedure was compared to standard micro-Kjeldahl and aluminum block digested-steam distilled-titrated (ABDDT) procedures. Thirty to 50 more samples could be analyzed per 8-hour day with the proposed semiautomated procedure as compared to standard micro-Kjeldahl methods. The precision of the methods were comparable but significantly more N was found by using the ABDDT procedure.

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