Low tunnels don't seem to make sense?
I put up a 4x20 low tunnel about a month ago, just so I could get something up and running. But the more research I've done, it just doesn't seem to make economic sense to bother with them, except maybe insect control. I've read a few studies on line, university type studies, not anecdotal personal experience stuff (not that those are not valid as well), and indicators are the low tunnel only gives you maybe three degrees of protection and very little increase in yields. Cost wise, I'm going to use a ten foot section on the low tunnel. Two ten foot sections will give me an eight foot high tunnel, which, if you believe the research, is going to give me more like seven or eight degrees of heat gain and significant increase in crop production. I guess the end walls are the big leap in switching to high tunnels?