To develop a method to visualize diffusion of zinc from fertilizers.
Zinc diffusion was assessed for three fertilizers in three soils of varying pH.
The fertilizer (zincSO4-coated monoammonium phosphate, MAP; zincSO4-coated diammonium phosphate, DAP; or zincSO4 alone) was applied in the centre of a Petri dish filled with soil.
The zinc diffusion zone was visualized at various incubation times (1, 7 and 18 days) by exposing a CaCO3-impregnated filter paper on the soil surface and colouring the zinc captured on the filter paper using dithizone.
The extent of diffusion was also assessed through concentric sampling and chemical analysis of soil sections.
The visualization results agreed with the chemical analyses and demonstrated the effects of soil properties and fertilizer formulation on zinc diffusion.
Combining zinc with P fertilizer restricted its diffusion, particularly with DAP fertilizer or in high pH soils.
Solubility considerations indicated that this was due to the formation of zinc phosphate minerals.
Lead research organisation
Host research organisation
University of Adelaide
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Related Final Reports By Crop type and Region
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Related Final Reports By Author(s)
F Degryse, R Baird and R McLaughlin
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Trial last modified: 21-10-2019 09:00am AEST
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