Answer: I use a simple soil probe to determine how deeply water is reaching. Use any long, sharp, pointed piece of metal or wood. Push it in the ground. It will move easily through moist soil, and stop where the soil is dry and hard. Asa general rule of thumb, trees and shrubs should be watered to a depth of 2-3 feet; turf, 4-6 inches, annuals, 12-18 inches. It's not fancy, but I find that it works well!
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