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Soil Science Society of America Journal Abstract -

Phosphate Fractions in Calcareous Soils as Altered by Time and Amounts of Added Phosphate1


This article in SSSAJ

  1. Vol. 44 No. 2, p. 269-277
    Received: Sept 20, 1979
    Accepted: Dec 4, 1979

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  1. M. L. Hooker,
  2. G. A. Peterson,
  3. D. H. Sander and
  4. L. A. Daigger2



Tie-up of water-soluble P is very rapid in calcareous soils. To determine the residual effect of high rates of applied P several experiments were established on soils ranging from 0.1 to 16.5% calcium carbonate equivalents (CCE). At each location an experiment was established with four rates of P (25, 50, 100, and 500 kg/ha). The soils were sampled annually for periods of up to 5 years. These soil samples were fractionated to determine the concentration of P in the various inorganic P fractions, using the techniques of Syers et al. (1972), as affected by rate of P application and time after application.

Over time there was a decrease in the more soluble, plant-available fractions indicating a shift of P from extractable to nonextractable forms. Also the various P fractions were correlated with two of the more commonly used soil methods, Bray and Kurtz no. 1 and the Olsen NaHCO3. As the CCE of the soils increased the correlation of the Bray and Kurtz no. 1 method with the fractions considered most available to plants decreased while the correlation of the Olsen method remained high.

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