One year I had the pine trees trimmed on my property. All branches went through the wood chipper and then on the blueberry beds. I had enough blueberries that year to even share with the birds!
Guess where my Christmas trees end up now!
Oh wow....so the pine needles definitely worked for you?
I read some website that said pine needles were useless to modify pH. Sounds like in your case it worked like a charm. I shoulda never let that site talk me out of it.