Our property is too large for any scale of watering. I water by hose the trees and shrubs I myself have planted when we go down every couple of weeks and that's it. Mother Nature has to do the rest or it dies. Our soil is pure sand IMHO, and dry as a chip most of the year. Ant hills almost ever 12" on our place, with 5-6 large fire ant mounds on average inside the cabin 1/2 acre inner-fenced yard. We treat those with Amdro or similar paroducts. No way to treat all ant hills there as we have them on such a massive scale. In a nutshell, it's a place on which you don't want to spend much time walking without rubber or snake boots to slow them down a bit. I keep mine at the cabin font door and don't go out without them on anymore. We plan to discuss the problem with the county agent to see if he offers any suggestions, but never catch him IN the office when we stop by on the way to the property. May try the 'appointment' route.
