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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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doi:10.2136/sssaj1975.03615995003900030042x

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

Abstract

Abstract

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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