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The current and residual value of superphosphate, Christmas Island C-grade ore, and Calciphos as fertilizers for a subterranean clover pasture

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Abstract

The effectiveness in the year of application of three phosphorus fertilizers, superphosphate, Christmas Island C-grade ore, and 500°C calcined Christmas Island C-grade ore (Calciphos), was measured for 5 consecutive years in a field experiment on a lateritic soil. The residual value of the phosphorus fertilizers was also measured for 6 years. Dry matter production of subterranean clover-based pasture and bicarbonate extractable soil phosphorus were used as indicators of fertilizer effectiveness.

Despite the use of very large amounts of C-grade ore and Calciphos, the plateau of the pasture yield versus fertilizer applied curve for these fertilizers did not reach the yield plateau achieved with superphosphate in either the short or long term.

C-grade ore and Calciphos were 3% and 8% as effective as superphosphate for dry matter production in the year of application. Relative to superphosphate applied in the current year the effectiveness of superphosphate decreased by about 70% between the first and second year after application and decreased by a further 14% from year 3 to year 6. C-grade ore and Calciphos remained about 2% and 9% as effective as currently applied superphosphate each year.

The residual value of superphosphate as measured by bicarbonate-extracted soil phosphorus decreased by about 60% from year 2 to year 7. The residual value of Calciphos was very low for year 2, doubled from year 2–4 and thereafter decreased gradually to its original value by year 7. The residual value of C-grade ore was extremely low throughout the experiment. Thus after year 2, compared to pasture yield, bicarbonate extracted soil phosphorus overestimated the residual value of superphosphate and calciphos.

It follows that neither C-grade ore or Calciphos are suitable replacement fertilizers for superphosphate for use on pastures growing on lateritic soils in south-western Australia.

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Authors and Affiliations

  1. Western Australian Department of Agriculture, 6450, Esperance, Western Australia, Australia

    Mda Bolland

  2. Western Australian Department of Agriculture, Jarrah Road, 6151, South Perth, Western Australia, Australia

    JW Bowden & MF D'Antuono

  3. Department of Soil Science and Plant Nutrition, University of Western Australia, 6009, Nedlands, Western Australia, Australia

    RJ Gilkes

Authors
  1. Mda Bolland
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  2. JW Bowden
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  3. MF D'Antuono
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  4. RJ Gilkes
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Bolland, M., Bowden, J., D'Antuono, M. et al. The current and residual value of superphosphate, Christmas Island C-grade ore, and Calciphos as fertilizers for a subterranean clover pasture. Fertilizer Research 5, 335–354 (1984). https://doi.org/10.1007/BF01049115

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