Everything You Wanted to Know About Center-pivot Irrigation and the Resulting Crop Circle Landscapes December 28, 2014Agriculture, All Posts, Engineeringcenter pivot irrigation, crop circlePete Lobner First deployed in Texas in 1949, this has become a water-efficient means to irrigate fields up to about 1/2 mile in diameter. Check out the story and lots of photos at the following link: http://www.kuriositas.com/2014/12/center-pivot-irrigation-real-crop.html?utm_source=howtogeek&utm_medium=email&utm_campaign=newsletter