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Why are grain stocks turned over and ventilated in large silos?

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Close-up of mature golden wheat (Triticum aestivum) heads and stalks densely packed in a field. — Cereal processing Common wheat (*Triticum aestivum*).

Grain stocks are turned over and ventilated in large silos primarily to manage the natural process of grain respiration.1

When grain is stored in large quantities with a high moisture content (typically over 16 percent), the heat generated by respiration cannot easily dissipate. This trapped heat causes the temperature of the grain bulk to rise, which in turn accelerates the rate of respiration, creating a cycle that can lead to significant spoilage.1

By turning over and ventilating the stocks, operators can effectively:
* Lower the temperature: Keeping the grain cool is essential to slowing down biological activity and preventing heat-related damage.1
* Prevent spoilage: Reducing temperature and moisture accumulation helps mitigate the risks of molds and fungi growth.1
* Deter pests: High temperatures provide a favorable environment for various insects, such as the grain weevil, which can cause substantial losses in weight and food value.1