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This article in AJ

  1. Vol. 59 No. 3, p. 240-243
    Received: Nov 16, 1966

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Comparison of Conventional and Automated Procedures for Nitrogen, Phosphorus, and Potassium Analysis of Plant Material Using a Single Digestion1

  1. R. L. Thomas,
  2. R. W. Sheard and
  3. J. R. Moyer2



Nitrogen content in 10 plant samples of widely varying concentrations of N, P, and K was measured by a H2SO4—H2O2 ashing procedure and the AutoAnalyzer system and found comparable to nitrogen content obtained by conventional Kjeldahl analysis. Phosphorus content measured by the AutoAnalyzer system on the same H2SO4-H2O2 ashing was similar to that obtained by dry-ashing combined with the molybdo-vanadate procedure. Potassium analyses on the solutions from the two ashing procedures by atomic absorption spectroscopy were comparable. Details are presented for simultaneous N and P analysis by the AutoAnalyzer and for K analysis by atomic absorption on plant material performed on a single H2SO4-H2O2 digest at a rate of 160 samples per week by one technician.

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