Fall Deep root feeding questions?

[Emerscape]

One of my customers desperatly wants me to do a deep root feeding on his property.. what product do you use? how much do you typically charge? and do you charge by plant shrub etc or do you charge by sq footage.

[Grassmechanic]

I use Arbor Green 30-10-7 and I add Iron to it. I charge by the shrub and by the caliper of the tree. You are going to have to know your costs, overhead, time, etc. to come up with a price. My minimum is $125.