microclimate → cold-pockets-and-inversions
Cold damage and frost injury are rarely uniform.
They occur in cold pockets created by temperature inversions and poor air movement.
Understanding cold air behaviour explains why damage patterns look irregular and unfair.
Under calm, clear conditions:
This creates a temperature inversion, where temperature increases with height.
Cold air behaves like a fluid.
It: - Flows downhill - Accumulates in low points - Becomes trapped by barriers
Cold pockets form in: - Depressions - Enclosed structures - Sheltered corners - Dense canopies - Poorly ventilated glasshouses
Patchy damage occurs because:
Plants metres apart can experience different minimum temperatures.
Inversions also increase disease risk by:
Cold pockets often double as high disease risk zones.
Cold air pooling often coincides with:
These effects persist beyond the cold event.
Heating air does not guarantee protection if:
Air movement is often more important than heat input.
Risk reduction strategies include:
Key mistake: - Measuring temperature too high above the crop
Cold damage is often an airflow problem, not a temperature problem.