Mobility of Polyphosphates in Soil1
- Isao Hashimoto and
- James R. Lehr2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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