The three ventilation levels recommended by Arvalis

Published on 05/30/2024

The temperature of the grains at harvest time is generally around 30°C. Moulds and storage insects can develop rapidly. Lowering grain temperature is the only readily available guarantee of good grain storage quality.

To ensure the quality and preservation of the grain, it must be cooled as quickly as possible to protect it from insect pests.

To achieve this, a cooling ventilation strategy needs to be put in place as soon as the crop is harvested, to lower the temperature of the grains to around 5°C at the start of winter.

Stored grain has a high thermal inertia, so it will stay warm for a long time if we wait for it to cool down on its own. Cold air is injected into the stocks in stages, as it is impossible to cool them to 5°C immediately after harvesting unless cold is generated mechanically using a chiller.

The temperature is therefore lowered in three stages:

  • The first round of ventilation takes place as soon as the crop is harvested. The aim is to cool the grain to around 20°C. in August. At this temperature, grain respiration, and therefore self-heating, is reduced.
  • In autumn, a second round of ventilation is carried out to bring the grain to a temperature close to 12°C in November to block the reproduction cycles of insect pests.
  • A third ventilation session is carried out at the start of winter to bring the temperature of the batches down to around 5°C or less in January. This level of temperature keeps the grain fresh in early spring and, if the cold exposure times are long enough, starts to generate mortality on insect pests.

How does Javelot meet the needs of ventilation landings?

Automating ventilation by entering the correct ventilation ranges allows you to reach the different ventilation levels more efficiently, while keeping energy consumption under control. 

Remember the ventilation levels:

- Optimise energy, consume less but better.

- Reduces the risk of condensation.

- Reduces the risk of pests developing.

"We chose Javelot to optimise our ventilation and improve efficiency.
Raphael COMPTE - Oxyane

In terms of quality, it's a real plus: far fewer insects and less insecticide.
Jean-Charles COURCOUL - Pelé Agri Conseil 

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