Apple tree problems
Hi I have a few apple trees with a small amount of leaves and the leaves are curled up like a taco. The soil ph is between 6-7. I do a deep watering when I check my moisture meter and it shows it's getting towards the low end of the scale. I have been feeding with 6-4-6 citrus fertilizer with some 21-0-0 ammonium sulfate and some ironite. This past couple weeks I've been starting to fertilize with iron and zinc chelate in case that was the issue since I read Iron may be hard to take in on high calcium soils such as there is around here in San Diego. I was thinking of getting some Epsom salts next to see if that could be the key, I'm down to guessing now what the solution could be. Thanks for your help!