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This article in SSSAJ

  1. Vol. 29 No. 5, p. 625-628
    Received: Mar 15, 1965
    Accepted: Apr 26, 1965

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Partially Acidulated Rock Phosphate as a Source of Phosphorus to Plants: II. Growth Chamber and Field Corn Studies1

  1. E. O. McLean,
  2. R. W. Wheeler and
  3. J. D. Watson2



Partially acidulated rock phosphate (with H3PO4) was studied using additional soils, application rates and preparation methods under growth chamber and field conditions. The yields and P contents of German millet and alfalfa in the growth chamber increased to a maximum at 66 pp2m P application and 20% acidulation on one group of soils and continued to increase with application rate and acidulation degree in another group. No appreciable difference was obtained with three methods of preparation of 20% acidulated material. Average field corn yield on five soils was highest with 20% acidulated material resulting in marked economic advantage of this material.

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