Quote:
Originally Posted by a.hulva@coxinet.net
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I have put pelletized sulfur on with little results. I am now going to apply powered sulfur an see what happens.
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Sulfur takes time to work. The elemental sulfur has to be converted to sulfate by soil microbe activity before acidification of the soil takes place. This link gives guid to calculate the amount of sulfur needed:
Soil Acidification: How to Lower Soil pH | Ohioline.
Another general 'rule of thumb' for potted plants is to apply (wet of dry) 1/2 teaspoon of sulfur per 6 inches of pot diameter to lower pH
by half a point.
Aluminum sulfate will work the quickest at 1 1/4 to 1 1/2 lb per 10 sft to lower 1 point.