This was broken by the blade of a tiller hitting it.
As you can see, the tiller sliced cleanly through the tubing.
Cut the damaged area out form the existing tubing. This is a small repair, but you can replace entire sections in the same manner.
This is simply a close-up view of the broken tubing.
Using 2 barbed half inch couplings and a new piece of tubing, insert the barbed couplings into each end.
Press the pieces together, you may have to work the pipe and fitting side to side while pushing it together.
Press the fittings in until the pipe meets the collar on the fitting.
Test the fitting to make sure it holds and that there are no leaks. These fittings do not require clamps since the pressure in the drip line should be below 40 PSI.