any ideas?

[kinzwas]

this is local to me and has me baffled.

 

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[kevkirki]

maybe sprinkler systems?....or UFO

 

[Farwalker]

maybe sprinkler systems?....or UFO

Could be areas where portable (chicken/turkey) pens were moved around a pasture after crops have been cut/bailed (hince"Range Fed")added-20/30% to egg market value.
Poultry ate the stubble/insects/airated & fertalized the ground.Could be the same for portable pens for lambs/expensive genetic-bred live stock??
Last but not least: Sat.-nite cowboy tangled up in his weedeater