The acidification process with elemental sulfur is slow and can take up to 6 months. It works faster when the soil is warm. Wait until spring to test the soil again and see what the values are. If you still think you need to use the iron sulfate use about 2 tablespoons per bush.
The acidification process with elemental sulfur is slow and can take up to 6 months. It works faster when the soil is warm. Wait until spring to test the soil again and see what the values are. If you still think you need to use the iron sulfate use about 2 tablespoons per bush.