That may be too much water depending on the amount that is applied in a 30 minute period by your watering system and the type of soil and its ability to drain well or not. I suspect you are overwatering the tree. It is not unusual for a plant to be stressed when planted during warm conditions. Root injury, dry roots, or soggy wet conditions can all create problem that show up as yellowing, browning and dropping of the leaves. Dig down a few inches around the plant and feel the soil to see if it is moist or not. Water only when it is starting to dry out a little.
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