Dr. Fred Below and others at the University of Illinois have demonstrated that rootworm traited corn requires more potassium than non-rootworm traited corn.
Dr. Below reported that a 200 bu/a corn crop will take up 274 lbs. K20 per acre or approximately 1.4 lbs. K20 per bushel produced. In his study, he utilized six different hybrid pairs that differed by the presence or absence of the rootworm trait at two locations over two growing seasons.
The rootworm traited corn required 13 percent more potassium than the non-rootworm traited corn.