Natural air and low-temperature drying systems are generally not recommended for Kentucky because of their slow drying rates. In such systems the grain near the top of the drying bin may remain undried for an extended period of time, possibly leading to grain spoilage and/or the production of aflatoxin.
Loewer, Otto J.; Bridges, Thomas C.; White, G. M.; Fehr, Robert L.; and Turner, Larry W., "Energy in Agriculture: Performance Evaluation for Natural Air and Low-Temperature Drying Systems" (1978). Agricultural Engineering Energy Series. 28.