Acidifying Soil for Blueberries

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I'm preparing to plant about 50 blueberry bushes in a few weeks. Unfortunately, I was not able to incorporate sulfur into the soil last fall to reduce the pH down from 7. I was considering incorporating sulfur into the soil, but also adding some aluminum sulfate to the planting hole for a more immediate effect just in the immediate area. Any suggestions on how much I should add to a hole as big around as a 5 gallon bucket but 3/4 as deep?
 
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No way to anwer unless you provide the existing pH and the soil type as it relates to density, as clay needs about 1.8 times what a loam needs. But then we have calculators. In any event do not try to suddenly change things, as a acid boundary is never a good thing for a root to meet as it will blunt them. Be gentle, the blueberries are tough enough to survive as you bend the soil profile like an artist, with sensitivity and grace.
 

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