Hello, this is my first post too.  I have just planted 6 blueberry plants on our new property so I'm new to them but have read that they love a bunch of organic matter and peat moss.  To correct the soil I am using some of Espoma Garden Sulfar, it ishere  at the bottom of the page.  So far all of mine are doing well.  Since I want them to establish their roots this year, I am also picking off all the flowers.  Hope that helps.