Most of Kentucky is dealing with some sort of record: record
low temperature, record snowfall amounts, record windchills. We hope our wheat crop is safe because the
snowfall has provided much needed insulation.
However many fields in western Kentucky had begun to ‘green-up’ prior to
these chilly conditions. Once we begin
to thaw out and get consistent warm weather we will need to assess the
damage.
To determine if freeze damage has occurred to the wheat, wait
until there has been at least 4 days above 40°F. If you inspect before this occurs you may not
get a clear picture of the damage because until temperatures reach at least 40°F
they are essentially in a ‘refrigerator’ and damage cannot be detected. Be patient, this time of year it may take
several weeks before conditions warm up.
Once conditions warm up, inspect a representative area of
your field for yellowing and plant death.
Pay particular attention to yellowing of the growing point and limp
leaves. In most situations 70 to 100 live
tillers per square foot will produce acceptable yields. If tiller counts are 50 live tillers per
square foot or less then yield reductions of up to 40% may occur. If they are between the 50 and 70 live tillers
per square foot then the higher N recommendations of 120 lbs N/A should be
considered for the Feekes 5 application.
An additional concern for wheat stands and yield potential
is heaving. If extreme temperature
changes occur the freezing and thawing cycle may push wheat plants out of the
soil. This will result in reduced stands
and could ultimately affect yield if heaving occurs on a large percentage of
the field.
For now, wait for warmer temperatures before assessing wheat
freeze damage.
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