What humidity levels are ideal for root cellars storing potatoes?

Optimal Environmental Conditions

For optimal potato storage, a consistent relative humidity of 90% is recommended. This can be achieved by maintaining a consistent temperature between 38°F (3°C) and 40°F (4°C). A temperature swing of more than 10°F (5.5°C) can lead to check spotting and other issues.

Managing Humidity Levels

To maintain the ideal humidity levels, ensure the root cellar is well-insulated and sealed. This will help to prevent moisture loss and maintain a consistent environment. If necessary, a humidistat-controlled water spray system can be installed to maintain the optimal humidity levels. A 10-gallon water tank can be sufficient for a small to medium-sized root cellar, and a spray system can be triggered every 10-15 minutes to maintain optimal humidity.

Designing an Effective Root Cellar

When designing a root cellar, consider using materials with high thermal mass, such as concrete or stone, to regulate temperature. A layer of insulation around the walls, floor, and ceiling will help to maintain a consistent temperature and humidity level. A door with an airtight seal will prevent moisture loss and maintain the optimal humidity levels. The door should also be designed to allow for air exchange, typically through a small ventilation opening near the top of the door.