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Colorimetric Determination of Urea in Soil Extracts Using an Automated System¹

ABSTRACT

A method is described for using an automated system to determine urea in 2M KCl soil extracts that contain a urease inhibitor (phenylmercuric acetate). The method is sensitive and precise and allows 90–120 extracts to be analysed per day.

¹ Contribution from the Institut fur Biochemie des Bodens, Bundesforschungsanstalt fur Landwirtschaft, Braunschweig, West Germany, and the School of Agriculture and Forestry, University of Melbourne, Australia.

² Alexander von Humboldt Research Fellow, now located at the Univ. of Melbourne, Australia; Professor and Director, Institut für Biochemie des Bodens, Bundesforschungsanstalt für Landwirthschaft, Braunschweig, Federal Republic of Germany, respectively.

Received for publication September 2, 1977. Accepted for publication December 12, 1977.