Why Do You Say NOT To Use Aluminum Sulphate In Blueberries?

In your June 12/20 article by Heather Rhoades you say NOT to use Aluminum Sulphate. All of the greenhouses in my area carry only that and recommend it for blueberries. Can you give me more detail why you recommend not using it and only using AMMONIUM sulphate? Thank you.

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2 Comments To "Why Do You Say NOT To Use Aluminum Sulphate In Blueberries?"

#1 Comment By MichiganDot On 06/16/2020 @ 1:33 pm

There are reports that aluminum sulfate can be toxic to blueberries if high rates are applied. Unfortunately, many gardeners try to quickly get their soil pH down to blueberry levels instead of making a gradual change and testing yearly. I am not the writer but that may have been the rationale. Here is a reference: https://www.canr.msu.edu/uploads/files/Lowering_Soil_pH_with_Sulfur.pdf ^[1]

#2 Comment By MichiganDot On 06/16/2020 @ 1:37 pm

I failed to indicate that there is an issue with aluminum toxicity to blueberry roots. https://www.nature.com/articles/s41598-019-47569-8 ^[2]

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URLs in this post:

[1] https://www.canr.msu.edu/uploads/files/Lowering_Soil_pH_with_Sulfur.pdf: https://www.canr.msu.edu/uploads/files/Lowering_Soil_pH_with_Sulfur.pdf

[2] https://www.nature.com/articles/s41598-019-47569-8: https://www.nature.com/articles/s41598-019-47569-8

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