A technique for the study of zinc release from controlled release fertiliser pellets


Research organisaton

Trial details

Researcher(s) D Joyce, C Asher, L Bell and D Edwards
Year(s) 1984
Contributor South Australian Research and Development Institute
Trial location(s) Site 3, Piednippie, SA
A technique for the study of zinc release from controlled release fertiliser pellets locations

To report on the development of a technique to visualise the movement of zinc from a controlled release fertiliser.

Key messages
  • A technique was developed to visualise the advancing zinc front from controlled release fertiliser pellets in agar medium. Dithizone was used as the indicator which changes from yellow to pink when it complexes with zinc.
  • The dithizone and the zinc – dithizone complex were immobile.
  • The rate of zinc movement was sensitive to temperature, being slower at lower temperatures.
  • As the pH was to decreased to 7 the dithizone and the zinc dithizone complex colours faded and the dithizone precipitated.
  • Comparison of the release rates from controlled-release pellets using the agar technique, sequential washing experiments and plant uptake demonstrated that the agar method ranked pellet types in the same order as these are the more complicated procedures.
  • Additionally the technique allows the effects of temperature on release from controlled releasing sources to be quickly assessed.
  • The agar medium, with other indicators, may be useful for a range of active agents as controlled-release materials become more widely used.
Lead research organisation N/A
Host research organisation N/A
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 Experimental
Trial design Replicated

Piednippie 1984

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Other trial notes

Joyce D, Asher C, Bell L, Edwards D (1984) An indicator – agar technique for the study of zinc release from controlled release fertiliser pellets. In Proceedings of the National Soils Conference. Brisbane, Queensland. (Ed. Anon.) pp. 33

Trial report and links

No trial reports or attachments found

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Trial last modified: 08-10-2019 15:38pm AEST