Gary Schnitkey
Gary Schnitkey
counties county deviation genetic greater large negative reduced worst year yield
No county has a 2005 deviation greater than its 1988 deviation, a year that was the worst for many counties. However, deviations for some counties in 2005 are large and in the 'second tier' of yield loses. While genetic improvements may have reduced yield losses, large negative yield deviations are still possible.
almost counties dispersion fairly greater illinois image losses mirror northern percent positive primarily southern state western yield
Having a geographical dispersion to yield losses is fairly typical. In 2002, for example, 42 counties located primarily in the southern part of Illinois had percent yield losses indicating greater than 20 percent losses. During that same year, 20 counties located primarily in the northern and western part of the state had positive yield deviations. The 2002 distribution is almost a mirror image of the 2005 distribution.
below farms yields
Some farms have APH yields below their most-likely yields.