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Winter Grain Storage Management
Grain should be cooled to about 25 degrees for winter storage to limit moisture migration and control insect problems. Insects in stored grain can be killed if this temperature is maintained during winter storage.
Grain in storage needs to be checked to be properly managed. Check for indications of moisture such as grain crusting or condensation on the bin's roof, and smell for musty, moldy odors. But just this is not adequate. It is essential to use a probe to collect samples from various locations.
Check and record the grain temperature at several locations in the bin. Both the temperature and trend in temperatures are important; both mold growth and insect activity will cause the temperature to increase.
Check the grain moisture content. The reading must always be adjusted based on the grain temperature, but remember that the moisture content reading is inaccurate at temperatures below 40 degrees. It is best to check the moisture content of collected samples after the grain has been warmed to room temperature. Warm the grain in an air-tight container, such as a plastic bag, to prevent the moisture content from changing during warming.
Also check the samples for insects after they have warmed to room temperature. Placing the grain on a white background will make it easier to see the insects. Cooling the grain to about 25 degrees is the best way to control the problem if insects are found.
Make sure all openings in the bins, such as vents and ducts, prevent snow from getting into the bin. These openings need to be there to allow air flow during aeration, but may be closed once aeration has been completed. Fans should be covered when they are not operating.
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