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This article in SSSAJ

  1. Vol. 39 No. 3, p. 537-540
    Received: Sept 30, 1974
    Accepted: Dec 16, 1974

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Utilization of Soil and Fertilizer Phosphorus Compounds by Slash Pine Seedlings in Relation to Their Solubility in Soil Test Extractants1

  1. R. Ballard and
  2. W. L. Pritchett2



Eight P compounds, monocalcium and dicalcium phosphates, fluorapatite, colloidal aluminum and ferric phosphates, potassium taranakite, wavellite, and strengite were evaluated as sources of P for slash pine (Pinus elliottii var. elliottii Engelm.) seedlings grown on two acids soils in the greenhouse.

Potassium taranakite and both colloidal phosphates were as effective P sources as monocalcium and dicalcium phosphate in stimulating tree growth. Fluorapatite was an effective source on a soil of pH 4.3 but was ineffective on a soil of pH 5.3. Wavellite and strengite were ineffective P sources on both soils. The uptake of P by seedlings corresponded closely to the amount of H2O-extractable P present following 2 months of incubation of the P compounds in the soils.

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