I am adding this information because I just had the need to irrigate some trees and found out how to do it. I was afraid it was going to be complicated, it only needed a little know-how.
It will help if you do some planning. You start with 3/4" polyethylene pipe (22 mm pipe is also available it is smaller in diameter and cheaper).You can get the 3/4" pipe at Home Depot for about $20 for 100 ft. Of course you can also get it from the catalog but I think it is cheaper because of the shipping charges.
First, you run this pipe along the row where the trees are. A dripper is needed for each tree, so you add the dripper directly to the pipe by punching a hole (special punch is needed) where each tree is and snapping the dripper in the punched hole. When done in this fashion, do all the punching first to be sure the holes are on the same side of the pipe.
The hardware used to work with this polyethylene pipe is very inexpensive. You can get couplers, ells, tees, plugs, etc., all barbed plastic. Depending on your system, you will need more or less of these.
You will also need a pressure regulator. The drippers will open at about 20 lbs. so, you need to regulate the pressure at 35 pounds. The drippers I ordered put out 2 gallons of water per hour but you have several choices.
Other hardware included steel straps to make the barbed connectors leakproof, goof plugs (19-7632) in case you poke a hole in the wrong place, and most important, a swivel 3/4" hose to 3/4" pipe adapter. This last one fits on the input end of the regulator. I did not get one of those, so I had to improvise.
I took a few pictures of the finished system which is fed at this time by a garden hose. I have only about 16 trees now but I will be adding more.
There are many other places on the Internet where you can find the supplies needed for drip irrigation. One of them is dripirrigation.com.
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There must be many different ways to water your trees, this is only one, I could have used 16mm pipe instead of 3/4" but I did not know about it, the 16mm pipe is much more flexible, much more inexpensive, and it also takes drippers. Before you jump on this with both feet, find out about the 16mm pipe.