Winter Flame Japanese Maple.
In the picture, the Winter Flame may not look like it came from a 25gallon container and is 6' tall. However it is! The new owners followed Wildwood Nursery instructions to a T when they planted it. The tree is mounded up high and rocks around the base hold the soil in place - functional and aesthetically pleasing.
The first step is to fill a 5 gallon bucket about half way and see if the roots quickly absorb the water. They should. The next step would be to adjust a [rainbird] micro bubbler so that it sprays to the edge of root ball. Then, determine how long the micro bubbler takes to fill a bucket halfway. Run the micro bubbler every two or three days.
Most importantly keep an eye on the plant if weather changes abruptly!