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This article in SSSAJ

  1. Vol. 37 No. 1, p. 36-41
     
    Received: Apr 1, 1972
    Published: Jan, 1973


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doi:10.2136/sssaj1973.03615995003700010016x

Mobility of Polyphosphates in Soil1

  1. Isao Hashimoto and
  2. James R. Lehr2

Abstract

Abstract

Ammonium ortho-, pyro-, tripoly-, tetrapoly-, and long-chain polyphosphates and cyclic ammonium tri- and tetrametaphosphates were surface applied to soil columns. After 1, 2, and 4 weeks the soil columns were sliced into 1-mm sections and examined for the distribution of P along the columns. Each soil section was analyzed for total and orthophosphate P in both the water-soluble and the immobilized (NaOH-extractable) fractions. The general features of the distribution patterns usually were established by the first week, after which soluble P moved much more slowly and the amount of immobilized P increased slowly. The total distance of movement and the distribution patterns of water-soluble P were similar for all the phosphates tested, but the polyphosphates differend markedly in the degree of immobilization of P and differed significantly in the positions of maximum retention of P in the soil columns. These positions of maximum retention had no apparent relation to the degree of condensation of the polyphosphates.

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