First spray water to cool down.
Spray water to cool down, you can spray water directly on the plastic film. By evaporating water and absorbing surrounding heat, the temperature in the film can be increased to ensure the normal temperature environment required by flue-cured tobacco seedlings.
Second, ventilation and cooling.
The method of ventilation and cooling is to punch holes in the plastic film. The hole should not be opened in the center of the plastic film, so as to avoid the adverse effects caused by the decrease of environmental temperature, but should be opened in the side of the seedling.
Third, blast to cool down.
Blow air to cool down, the ventilation pipe can directly introduce the first layer of film, and blow a lot of cold air through the blower to achieve the purpose of cooling down.