Why the wheels?

/ Why the wheels? #3  
They look like they came from a giant mutant erector set.
 
/ Why the wheels? #4  
I would venture a guess that they are used to cut drainage channels in wet fields. I have seen similar wheels on four wheelers for that purpose.
 
/ Why the wheels? #5  
Around here they are used to spray levee's in rice fields. Occasionally they also will be used when spraying a crop such as soybeans after the plants have bushed out enough to prevent the passage of a normal tractor tire without crop damage.
 
/ Why the wheels? #6  
They look like they would give awesome traction and less soil compaction than a normal width tire.
 
/ Why the wheels? #7  
They could be Amish and not able to use rubber tires.
 
/ Why the wheels? #9  

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