Fertilizer research

, Volume 24, Issue 3, pp 149–157 | Cite as

A discussion of the methods for comparing the relative effectiveness of phosphate fertilizers varying in solubility

  • S. H. Chien
  • P. W. G. Sale
  • D. K. Friesen
Article

Abstract

Because various phosphate (P) fertilizers differ widely in their solubility, it is commonly observed that crop response to P fertilizers varies under the same soil and crop conditions. Furthermore, a major problem encountered in the methods for determining the relative effectiveness (RE) of water-insoluble P fertilizer (e.g., phosphate rock) with respect to water-soluble P fertilizers, e.g., single superphosphate (SSP) and triple superphosphate (TSP), is that their growth response curves are usually nonlinear and often do not share a common maximum yield. In this paper, we review and discuss the advantages and disadvantages of the three most commonly used methods for calculating the RE of phosphate rock with respect to TSP (or SSP). The three methods are vertical comparison, horizontal (substitution rate) comparison, and linear-response comparison.

Key words

Phosphate rock SSP TSP partially acidulated phosphate rock relative effectiveness (RE) index substitution rate (SR) 

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References

  1. 1.
    Barrow NJ (1985) Comparing the effectiveness of fertilizers. Fert Res 8: 85–90Google Scholar
  2. 2.
    Bationo A, Chien SH, Henao J, Christianson CB and Mokwunye AU (1990) Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger. Soil Sci Soc Am J (in press)Google Scholar
  3. 3.
    Bolland MDA, Weatherley AJ, Gilkes RJ and Bowden JW (1986) Granular reactive apatite rock phosphate is not an effective phosphorus fertilizer in the short term on lateritic soils in south-western Australia. Aust J Exp Agric 26: 217–225Google Scholar
  4. 4.
    Bolland MDA and Barrow NJ (1988) Effect of level of application on the relative effectiveness of rock phosphate. Fert Res 15: 181–192Google Scholar
  5. 5.
    Bolland MDA, Gilkes RJ and Allen DG (1988) The residual value of superphosphate and rock phosphates for lateritic soils and its evaluation using three soil phosphate tests. Fert Res 15: 253–280Google Scholar
  6. 6.
    Chien SH (1979) Dissolution of phosphate rocks in solution and soils. In: Seminar on Phosphate Rock for Direct Application pp 448–463. International Fertilizer Development Center, Muscle Shoals, Alabama, USAGoogle Scholar
  7. 7.
    Chein SH and Black CA (1976) Free energy of formation of carbonate apatites in some phosphate rocks. Soil Sci Soc Am J 40: 234–239Google Scholar
  8. 8.
    Chien SH and Hammond LL (1978) A comparison of various laboratory methods for predicting the agronomic potential of phosphate rocks for direct application. Soil Sci Soc Am J 42: 935–939Google Scholar
  9. 9.
    Chien SH and Hammond LL (1989) Agronomic effectiveness of partially acidulated phosphate rock as influenced by phosphorus-fixing capacity. Plant and Soil 120: 159–164Google Scholar
  10. 10.
    Chien SH, Sale PWG and Hammond LL (1990) Comparison of effectiveness of various phosphate fertilizer products. In: Proceedings of the Symposium on Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania. International Rice Research Insitutte, Los Baños, The Philippines (in press)Google Scholar
  11. 11.
    Colwell JD and Godert WJ (1988) Substitution rates as measures of the relative effectiveness of alternative phosphorus fertilizers. Fert Res 15: 163–172Google Scholar
  12. 12.
    Engelstad OP, Jugsujinda A and De Datta SK (1974) Response by flooded rice to phosphate rocks varying in citrate solubility. Soil Sci Soc Am Proc 38: 524–529Google Scholar
  13. 13.
    Hellums DT, Chien SH and Touchton JT (1989) Potential agronomic value of calcium in some phosphate rocks from South America and West Africa. Soil Sci Soc Am J 53: 459–462Google Scholar
  14. 14.
    Khasawneh FE and Doll EC (1978) The use of phosphate rock for direct application to soils. Adv Agron 30: 159–206Google Scholar
  15. 15.
    Kpomblekou K (1989) Evaluation of phosphate availability from phosphate fertilizers derived from Togo phosphate rock. MS Thesis, Tuskegee University, Tuskegee, Alabama, USAGoogle Scholar
  16. 16.
    Leon LA, Fenster WE and Hammond LL (1986) Agronomic potential of eleven phosphate rocks from Brazil, Colombia, Peru, and Venezuela. Soil Sci Soc Am J 50: 798–802Google Scholar
  17. 17.
    Palmer B, Bolland MDA and Gilkes RJ (1979) A re-evaluation of the effectiveness of calcined Christmas Island C-grade rock phosphate. Aust J Exp Agric Anim Husb 19: 605–610Google Scholar
  18. 18.
    Terman GL and Engelstad OP (1976) Agronomic evaluation of fertilizers. Bull. Y-21, National Fertilizer Development Center, Muscle Shoals, Alabama, USAGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • S. H. Chien
    • 1
  • P. W. G. Sale
    • 2
  • D. K. Friesen
    • 1
  1. 1.Agro-Economic Division, IFDCMuscle ShoalsUSA
  2. 2.School of AgricultureLa Trobe UniversityBundooraAustralia

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