Average yields and yield ranges from the 2005 Iowa Crop Performance Test-Corn. District 1: Average 171 (range 138–192), District 2: Average 202 (range 171–221), District 3: Average 204 (range 179–224), District 4: Average 187 (range 172–202), District 5: Average 197 (range 170–220), District 6: Average 168 (range 146–191), District 7: Average 192 (range 164–213).