If you have difficulty determining how to manage your low-temperature drying from this guide, contact your area agricultural engineering specialist at your local University Extension center for help. Layer drying With low-temperature layer drying, the bin is filled in two or more fillings or layers and each fill layer is dried before the next layer is added. The depth of each fill depends on the moisture content of the corn, the depth of dried corn already in the bin and the amount of air delivered by the fans. Adding layers at depths greater than those recommended increases the chance of mold. Because the time to dry a layer of wet grain can take four to 14 days, layer drying works best where several bins are equipped for low-temperature drying.
Harvesting can proceed more rapidly because the grain is drying in several bins at the same time.
This table was prepared on performance data of typical vaneaxial fans. At the grain depths used in drying as described in this guide, vaneaxial fans are recommended. The adjustment factor is bolded for the fan-bin combination recommended when the unit is purchased. This is an estimate. The next layer can be added when a visual inspection or a moisture test determines that the top surface of the last layer added has dried to 15 percent moisture or less.