I'm backing out I dont believe in foliar sprays.
My citrus is in sorry red clay soil I dont fertilize and it seems to grow even though I gave up on it for the time being.
If the root ball is below the surrounding soil it needs to be brought up level and the roots need to be covered.
Figs are the only tree I know of that likes to be planted below the soil level and covered up.
Get rid of the grass around the tree about 3 feet out and level the soil out to the root ball and make a water saucer.
Fill this water saucer up at least once a week until it stops draining more if it is hot and dry.
Mulch.
Put your nutrients in the soil and the tree will grow like a weed.
I have planted untold 100's of trees some with root ball 6 feet in diameter.
Worth