It's from a center pivot irrigation system.

Thought it might be the practice area for crop circle making class....

but I guess the above posters found the answer.

Maybe you can make even lower res screenshots next time? The detail is just too much -_-

I wish google forums would be readily available when using google earth. I also wish they would placemark these things so people casually browsing can see at a glance what they are looking at, when it comes to pivot irrigation. Old as the hills since GE came about, all over the keyhole forums when they were around/active/popular/findable..

They're all over the middle east too.

I thought he was joking when he posted that! lol

I got a tour of one of the "crop circles". The irrigation has a bit of fertilizer in it and bacteria. I don't recall why they add the bacteria. Cutting the alfalfa is done at stupid O clock to achieve some sort of water content. The base knows this due to employees living in town, so I'm sure they don't fly the saucers during harvest time. ;-)

just tried the links now dead boooooo lol