Jipson and chickens will raise the ph and pine needles coffee grounds and compost will lower it but soil has a natural balance or buffer it will return to its natural state. Epson salt make a good fertilizer for evergreens and roses and like blueberries like a higher ph soil. ammonium sulfate or sulfur-coated urea are typicly used fertilizers to lower ph. If your blueberry bush’s leaves turn a reddish yellow color, especially near the edges of the leaves, this is most likely a magnesium deficiency. If the leaves turn yellow with green veins, it is most likely an iron deficiency.
