I'm looking into offering deep root fertilization of trees/plants and just wondering if I could get some feedback from those who offer this type of service about what kind of equipment your using. All I could find were the spike type feeders that hook up to a hose and feed liquid, and then there is a Webster deep root feeder which has a 2hp engine that powers a 1 1/2"auger with an attached 20lb hopper that deposits granular fert after the hole is drilled. Couldn't find a single other company that offers a gas powered root feeder. I'd love to hear some reviews on this type of power granular feeder or the liquid spike type or any other options that are available/being used. Thanks, I appreciate any info on this.