From the Bloomington Pantagraph:
GIBSON CITY — Ford County authorities have identified the farmer who was killed early Wednesday morning in a mowing accident as Michael J. Schroeder, 60, of rural Gibson City
He was pronounced dead at the scene at 1:30 a.m. Wednesday at county roads 300N and 70 E west of Gibson City. Ford County Sheriff Mark Doran said Schroeder was mowing along the edge of a creek in that area when a tire of his tractor apparently slipped off the edge of the waterway. The tractor rolled on top of him.
Schroeder was found when family members started looking for him when he did not return home at dusk.
Here are some links on farm safety:
Farm Safety 4 Just Kids
Medline Plus - Farm Safety
National Safety Council