Fertilizer research

, Volume 13, Issue 1, pp 31–44 | Cite as

Long-term greenhouse evaluation of partially acidulated phosphate rock fertilizers

I. Effect of acidulant and degree of acidulation on availability of P from two phosphate rocks
  • D. K. Friesen
  • P. W. G. Sale
  • G. J. Blair
Article
Accepted:

Abstract

Twelve granular partially acidulated phosphate rock (PAPR) fertilizers were compared with unacidulated phosphate rocks (PR) and superphosphate at five rates of total P in the presence and absence of supplementary sulfate and plant residue recycling treatments in a long-term green-house experiment with lucerne (Medicago sativa L., cv. CUF101). The PAPRs were prepared from two PRs (Christmas Is. A grade and Duchess, Queensland) and acidulated at two rates (25% and 50% on an H2SO4 to single superphosphate basis) with either H2SO4 or H3PO4. Six harvests (each bulked from three cuttings) were collected over a 2-year period. It was generally found that lucerne response to PAPRs depended closely on their water-soluble plus citrate-soluble P contents which increased with increased degree of acidulation. The H3PO4 tended to yield more soluble P on acidulation of PR than H2SO4 and acidulation of Christmas Is. PR yielded more soluble P than did acidulation of Duchess PR. There was little evidence for enhanced availability of P due to action of the triple point solution in hydrolyzing granules on residual PR in those granules.

Key words

Partially acidulated phosphate rock P uptake lucerne phosphoric acid sulfuric acid 
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Copyright information

© Martinus Nijhoff Publishers 1987

Authors and Affiliations

  • D. K. Friesen
    • 1
  • P. W. G. Sale
    • 1
  • G. J. Blair
    • 1
  1. 1.Department of Agronomy and Soil ScienceUniversity of New EnglandArmidaleAustralia

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