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Granule Size and Composition of Superphosphate Containing Added Copper and Zinc¹

ABSTRACT

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.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Univ. of W. Australia, Nedlands, W.A. 6009, Australia. Supported by Australian Wheat Industry Research Council.

² Associate Professor and Research Officer, respectively.

Received for publication October 14, 1980. Accepted for publication March 20, 1981.