Composted pine needles are what I use on my strawberries to lower ph and increase production but I do not put them on bannanas, mine grow just fine putting vermiculture vertilizer on them (red worm composter) I grow hydroponic lettuce in a eb and flow system in the winter and the below link is where I get ph adjusting chemicals and fertilizers they have better pricing than I can get locally; places around here cater to people who grow illegal things and have crazy prices and one cold not make a profit on head lettuce unless it could be sold for 20 dollars a head if I used local suppliers
Fertilizer Compounds