Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Cold Temps – Grain Bin Aeration?

Posted by romeethredge on January 7, 2015

These cool nights made me think about the benefits of cooling grain in storage to help with insect problems. I like corn and they do too and try to get at it if they can.  If we move the grain temperature in bins  below 60 degrees F. they won’t reproduce.

Figure 3. Duct system for round or rectangular bins.

Dr. Mike Toews, UGA Entomologist, has this to say about how we should aerate.

“For operators storing small quantities of grain (i.e. wagon, truck, flat, or a small bin), running bins during a few cold nights would be a good idea as it will quickly move the grain temperature below 60 degrees where the insects will not be able to reproduce; however, operators that have big bins should not just run the fans for a few nights as that could leave the grain mass with radically different temperatures at different depths thereby leading to moisture migration.

 Fans on big bins (1000 bu+) should be operated using a thermostat with set points at 75, 65, and 45 degrees.  Start at the 75 degree set point, which will operate the fans anytime the outside temperature is below 75 degrees.

Monitor the grain temperature at different depths and leave the fans operating until the entire grain mass is at or below the set point; then move to the next lower set point and start the process over.

When the grain mass is entirely below 45 degrees, turn the fans off and seal up the vents and fans.  After achieving a grain temperature below 45 degrees, some folks will operate the fans about one day a month to remove musty odors.

Operators that pull air from the top need only monitor the air temperature coming out of the fans to know when they have reached the set point.”

We have a good UGA publication concerning Aerating Grain in Storage.

Here’s a link to Dr. Toews’ Stored Product Management page.

Dr. Toews will be presenting a session on stored grain management at the upcoming Corn Short Course in Tifton on Jan. 20.


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