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Abstract

 

This article in SSSAJ

  1. Vol. 37 No. 3, p. 351-355
     
    Received: Sept 18, 1972
    Accepted: Jan 26, 1973


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doi:10.2136/sssaj1973.03615995003700030013x

Nature of Phosphorus Retention and Adsorption with Depth in Soil Columns1

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

Abstract

Abstract

Sequential fractionation of adsorbed 32P and changes in equilibrium P concentration (EPC) with depth were studied in a column leaching experiment. In general, the percentage of NH4Cl-extractable P decreased rapidly with depth; the percentage of NH4F-extractable P decreased rapidly in the initial 2-cm depth and then remained fairly constant. Percentage NaOH-extractable P increased as that of NH4F-extractable P decreased, and that of H2SO4-extractable P increased gradually with depth.

Equilibrium P concentration (EPC) decreased with depth and increased as rate of P applied increased. These EPC values reflected both depth of penetration of applied P and level of native P in the soil.

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