Eh, it's not really necessary, we've compared our rain water crops with irrigation and when it came down to it, the net income we were both making was about the same at the end of the day.

Farmer here, irrigation is actually expensive to not only install but to run, just imagine the water bill. We just slap our wheat seed into the ground with some pot ash and rely on Mother Nature to provide rain. At most, the kids may be pulling weeds but if you plant your wheat seeds close they can usually over take the weeds.