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This article in SSSAJ

  1. Vol. 45 No. 4, p. 813-815
    Received: Oct 14, 1980
    Accepted: Mar 20, 1981

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Granule Size and Composition of Superphosphate Containing Added Copper and Zinc1

  1. R. J. Gilkes and
  2. S. B. Sadleir2



This study determined the distribution and forms of P, S, Ca, Cu, and Zn in Cu-Zn superphosphate in order to determine whether uniform application of nutrients to soils is promoted by use of such fertilizers. Concentrations of insoluble and water-soluble Cu, Zn, Ca, P, S, and citrate-soluble P in various sized fractions of commercial Cu-Zn superphosphates were almost uniform, apart from a relative concentration of insoluble Cu in the finest-sized fraction. Most of each constituent was present in 1- to 4-mm granules as a consequence of the preponderance of this size granule in the fertilizers. Individual granules were chemically analyzed and showed little variation in S, Ca, and P concentrations, whereas much wider variations occurred in Cu and Zn concentrations. These variations probably are not of agronomic significance.

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