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Mobility of Polyphosphates in Soil¹

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.

¹ Contribution of the Fundamental Research Branch, Division of Chemical Development, TVA, Muscle Shoals, Alabama 35660. Presented in part before Div. S-2, Soil Science Society of America, Aug. 25, 1970, Tucson, Ariz.

² Research Chemists.

Received for publication April 1, 1972. Accepted for publication September 27, 1972.