Plant and Soil

, Volume 110, Issue 1, pp 137–139 | Cite as

A rapid method for determination of nitrate in soil and plant extracts

  • J. P. Singh
Short Communications


A rapid colourimetric method of determination of nitrate was modified. Proposed modifications eliminated the use of barium sulphate and introduced diazotization of sulphanilamide by the nitrite ion obtained by the reduction of nitrate and subsequent coupling with N-1-naphthyethelenediamine dihydrochloride. Introduction of filtration in place of centrifugation of coloured solution simplified the procedure. Determinations were highly reproducible with coefficient of variation of 2.2 and 2.9% for soil and plant extracts respectively.

Key words

colourimetric diazotization nitrate nitrite reduction filtration 


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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • J. P. Singh
    • 1
  1. 1.Division of Crops and Soil ScienceCentral Potato Research StationJalandharIndia

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