Some may have seen this already especially at nursery outlets which is where I saw it first. The method is especially good for recently planted trees it may not be enough for mature trees.
The method uses small diameter flexible tubing approx 1/4 inch (~6 mm) and pieces of irrigation tubing to diffuse the water exiting the small tubing.
First cut pieces of the small tubing to the desired length, make angled cuts on each end, I use a very sharp standard pruning shear.
Then cut 2 inch (50mm) pieces of large diameter tubing.
Using a standard punch or other tool punch a small hole in the 50 mm long pieces large diameter tubing. Using a suitable angled piece of plastic, I use an old stake emitter, ream out the small hole by stretching it but not cutting into the plastic.
One the hole is enlarged, work the angle cut end of the small tubing into the diffuser piece. The plastic will stretch and then tighten back to hold tight.
Repeat the process at the location needed along the run of the irrigation line close by the desired root zone of the plant or tree.
Hope this helps. The small tubing seldom clogs, but sometimes rats or squirrels do chew on the tubing and it needs to be replaced. I got mine in a 1000 foot roll at the irrigaton supply house.
here are some pictures:
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