Premium Fertilizer for Oaks

What is the N-P-K ratio?

I have just planted an oak ( miami ) ( 100 gallons pot ) the tree is about 16 feet height. is it recommended to fertilize it? when and how?

I am planting a 3 ft tall shumard oak. how would i apply this? can i mix in the soil i am using for backfill?

can i use this on a newly planted oak cutting.