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This article in SSSAJ

  1. Vol. 31 No. 2, p. 219-222
    Received: July 20, 1966
    Accepted: Sept 20, 1966

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Interaction of Ammonium and Potassium in a Potassium-Fixing Soil1

  1. R. J. Bartlett and
  2. T. J. Simpson2



Different levels of NH4 and K were supplied to a K-fixing soil (Buxton silt loam) containing the nitrification inhibitor 2-chloro-6-(trichloromethyl) pyridine. Maize (Zea mays L.) seedlings were grown in the soil under controlled conditions.

  • When K was equilibrated with this soil first, adidtion of NH4 had almost no effect on the availability of K, as indicated by extraction with NaOAc or by uptake of maize seedlings.

  • Equilibration of the soil with NH4, before the addition of K, increased the amount of K extracted, increased the percentage of K in the p ants, and increased the yields of seedlings.

  • Addition of NH4 at the same time as K was at least as effective as its addition before K in increasing yields as we 1 as amount of K taken up by the plants or extracted chemically from the soil.

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