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Table 2. Establishment time and watering <br />volume for newly planted trees. <br />Caliper <br />(inches) <br />4 <br />5 <br />6 <br />Root Water <br />establishment applied <br />time for trees during each <br />(years) irrigation <br />(gallons) <br />3 <br />4.5 <br />6 <br />7.5 <br />9 <br />2-3 <br />3-4.5 <br />4-6 <br />5-7.5 <br />6-9 <br />Caliper: <br />• trunk diameter at 6" above the ground <br />for diameters up to 4" <br />• If the caliper at 6" above ground <br />exceeds 4", measure caliper at 12" <br />above ground. <br />How to measure tree caliper. <br />Where to water <br />Apply water directly over the root ball. Also be sure to keep the backfill soil in the planting hole <br />moist. This encourages the roots to expand beyond the root ball into the backfill soil. Tree roots <br />grow 18 inches Nci ycal in Minnesota so remember to expand the area being <br />watered over time. <br />Initial watering of a newly planted tree or shrub is easily accomplished by creating a circular <br />mound of earth 3 to 4 inches high around the plant at the edge of the root ball to create a <br />reservoir for irrigation water. A slow trickle of water can be used to fill this reservoir, which <br />