Managing Stored Grain
Figure 48 - Bin Coring Diagram
Coring of bin should be performed by unloading grain periodically (e.g. each time several feet of new grain is
added) as shown in Figure 48. Coring in this manner pulls down grain peak. Coring during initial filling also
removes a major amount of fines and foreign material - more than if the bin is cored after it is filled.
When coring a bin after filling is complete, remove about half the peak height for improved aeration. After coring,
top of grain should be visually inspected to ensure an inverted cone has been created, as in Figure 48. If no cone
is created, bridging of grain has occurred and a very unsafe condition has been created. Do not enter bin until
bridging situation has been safely corrected.
Moisture Migration
Crops are normally placed in storage at temperatures much warmer than winter temperatures. Since grains are
good insulators, grain in center of bin will be at same temperature as at harvest, even after outside temperatures
have dropped well below freezing. This temperature differential causes moisture migration.
Figure 49 - In-Bin Moisture Migration
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