A slow release boron phosphate to mitigate boron deficiency in high rainfall environments


Research organisatons

Trial details

Researcher(s) M Abat, M McLaughlin, F Degryse, B Ajiboye, B Baird and S Stacey
Year(s) 2012
Contributor South Australian Research and Development Institute
Trial location(s) Adelaide, SA
Further information View external link
A slow release boron phosphate to mitigate boron deficiency in high rainfall environments locations

To discuss how a slow release boron phosphate to mitigate boron deficiency in high rainfall environments.

Key messages
  • Boron phosphate compounds were synthesized by mixing boric acid and phosphoric acid (1:1 molar ratio) and heating at temperatures of 25 to 1000 °C for 1 or 24 h.
  • X-ray diffraction patterns and chemical analysis results showed formation of boron phosphate compounds at low temperature • These compounds gradually crystallized with increasing temperature and heating time.
  • The compounds synthesized at 300°C or less were hygroscopic, while those synthesized at 500 to 1000°C were non-hygroscopic and free-flowing.
  • The solubility of all compounds decreased with increasing synthesis temperature • The solubility of compounds synthesized at 500 and 800°C increased with increasing pH.
  • The compound synthesized at 1000°C was nearly insoluble and the solubility was not pH dependent.
  • The release of B from the boron phosphate synthesized at 800°C for 1 hour was approximately 70% after 150 days, which confirmed its slow release.
  • The characteristics of the compounds synthesized at temperatures 500 and 800°C showed that it can be used as raw materials for co-granulation with macronutrient fertilisers such as mono-ammonium phosphate.
  • Such co-granulated products are currently being tested.
Lead research organisation N/A
Host research organisation CSIRO - Waite Campus
Related program More Profit from Crop Nutrition
Acknowledgments N/A
Other trial partners Not specified


Crop type No crop specified
Treatment type(s)
  • Fertiliser: Form
Trial type Unknown
Trial design Unknown

Adelaide 2012

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

Trial report and links

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Trial last modified: 07-05-2019 19:13pm AEST