Why do people burn (light on fire) there grass?
 

When I was in Mississippi in 1981 I drove buy this guy who was burning his
grass (not the clippings) which was a controlled grass fire. It was dry and
the grass burned and he had a hose which was directing where the burn was
going. If I remember it was a 200 x 200 area. Is there any particular
benefit to this? I did a search but did not turn up anything. It was done
either late fall or late winter.
Thanks
Greyhound
Tampa, FL