Air naturally moves up in a bin. Moving with the air is moisture from the grain. As the moisture nears the top of the grain it tends to condense out on the top several inches or maybe a foot of grain. Why??? This grain is usually cooler due to the outside air. Even though the grain is cooler it begins to mold and bind together. I have caught this top 6 inches ringing wet. If the farmer would have caught it in the early stages (grain is still loose) turning on the fan for a few days would "blow" the moisture out drying the top layer of grain. Once the grain gets moldy and crusty the fan won't help much as the air can't get through. This problem can be solved by: 1) Drying the grain to an appropriate mositure (13.5%, 14%, 15%); 2) cooling the grain when it gets real cold after harvest (late Nov); 3) put air on the bin again mid winter (Jan) for a few days; and 4) put air on the bin again to warm it up and further reduce moisture (late March or April). This crust is more hortizontal across the top rather than vertical. Although I have seen vertical bridging were fines have gathered and "molded" the corn in the center. Hope that helps explain the process.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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