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This article in SSSAJ

  1. Vol. 37 No. 3, p. 371-374
    Received: Sept 18, 1972
    Accepted: Jan 26, 1973

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Effects of Phosphorus Application Rate, Soil Properties, and Leaching Mode on 32P Movement in Soil Columns1

  1. T. J. Logan and
  2. E. O. McLean2



Movement of 32P-labeled monocalcium phosphate was investigated in column experiments with P application rate, P-fixation capacity, and mode and intensity of leaching as variables. Three soils of contrasting texture and P-fixation capacity were studied. Leaching of P increased with P application rate and intensity of leaching. Constant head leaching resulted in greater movement of 32P out of the surface layer and greater accumulation in the leachate than intermittent leaching. In general, 32P recovered in the leachate was nonionic except in instances where maximum leaching occurred. Significant amounts of 32P were recovered in the leachate only with sandy loam soil and at the highest P application rate.

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