Around here, we don't use any irrigation at all. We depend on Mother Nature for all of our moisture, and it works well for us. Our soil holds a lot of moisture — about 2 inches per foot of water. So it takes about 20 inches a year to grow a crop of corn, and corn roots will go down approximately 5 or 6 feet. If your soils aren't too compacted, they might even go 7, 8 or 9 feet. So if you looking at starting out with 2 inches a foot, then you're looking at only needing about 6 to 8 inches; and maybe and you're sitting all right. That’s a nice advantage to have.