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This article in AJ

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


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doi:10.2134/agronj1967.00021962005900030010x

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

Abstract

Abstract

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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