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Abstract

 

This article in SSSAJ

  1. Vol. 29 No. 4, p. 393-394
     
    Received: Nov 20, 1964


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doi:10.2136/sssaj1965.03615995002900040014x

Gradient Elution of Soil Phosphorus1

  1. Y. Avnimelech and
  2. J. Hagin2

Abstract

Abstract

Soil phosphorus was fractionated by the means of gradient elution technique used in chromatography. This method involves a nonequilibrium extraction of the soil P, whereas conventional methods are based on equilibrium extraction. Non-equilibrium extraction is needed in order to describe the fate of the applied P before it reaches equilibrium with the entire soil system.

Soil samples were leached with a solution of linearily increasing acidity. Thus soil P was fractionated according to its solubility in acid. Upon leaching a soil sample, fertilized with superphosphate, two steps in P fixation could be demonstrated. The first step was a rapid one, decreasing the water solubility of the P, yet keeping it soluble in mildly acidic solutions. In the second slower step, P solubility in acidic solutions was decreased.

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