On April 4th I toured southwest Oklahoma and surveyed freeze injury to wheat. In my experience, most freeze events are overhyped; however, this one was the real deal Holyfield. I traveled a route from Faxon to Chattanooga to Altus to Blair and ended up at Apache. Damage was similar at all sites, with injury ranging from 50 to 80%.
The best looking wheat was the hardest hit. Particularly troubling are some fields in the Altus area that easily had 80 bushel potential prior to the freeze. In most of these fields we are too far past the tillering stage to have yield compensation from secondary tillers. Late-emerging fields that were jointing or smaller escaped the freeze with little injury. Fields that had been heavily grazed and/or under-fertilized also escaped with relatively minor injury. Conditions improved slightly when I checked wheat in the Chickasha area and injury was more in the 10 – 30% range.
I am frequently asked if the injured wheat head will go ahead and “push through” as the season progresses, and the answer is no. So, if you see heads emerging out of the boot in a few weeks, they are likely not damaged and a head count at this stage will be a reasonable estimate of fertile heads. Since there will not be additional stem elongation in freeze injured wheat, it will not accumulate as much tonnage as in a ‘normal’ year.
I have posted a few pictures below showing freeze injury symptoms. Freeze injury can vary greatly among fields and even within a field. So, it is important to check several sites within a field and split several stems when determining the percent injury. Check early maturing varieties such as Jackpot, Billings, and Everest first, as they are most likely to have injury.
Reblogged this on The Wheat Beat and commented:
Great insight from Jeff Edwards, Small Grains Extension Specialist at Oklahoma State University, on the impact of freezing temperatures on that state’s wheat crop.
Thanks for the reblog
Glad to. Now we’re facing the freeze in Kansas.
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Thanks for the reblog
What is the thoughts of the young wheat that the flag leat is shooting out of the boot completely fried is there any chance of recovery and can the flag leaf with very little green left make a head or fill grain?
If the flag leaf is heavily damaged and the head is okay, then my primary concern is head trapping. Similar to what you would see with 2,4-D injury. In this case, the head will still make some grain, but no where close to full potential. If the head is not trapped and the flag leaf emerges okay, then impact on grain yield will not be as severe because the F minus one leaf can step up and help with grain fill if the flag leaf is damaged