I own and run a landscaping business here in mo. and we have found that using the drip with spaghetti tubing combined with the pvc buried next to the root ball is very effective at watering the trees. We place two tubes into the 1 1/2 inch pvc so the water gets to the bottom of the ball to promote a deeper root zone. It also comes in handy for using fertilizers. take slow release granules and place in the pvc per label and every time you water your tree is getting trace amounts of fertilizers. Especially useful when trees are next to your pond due to reduction in runoff because of heavy rains..
