Other defense systems, whose effectiveness is still little confirmed and in any case variable, are those of the application on crops of protective products against thermal lowering, with presumed anti-freeze action.
Burners and anti-freeze spark plugs are systems that are based on the direct transfer of heat to the environment.
This techniques remix the air and counteracts layering.
Fans are the most common devices used in alternative anti-freeze systems to irrigation.
This technique may be used to partly remedy the elevated water requirements of the classic over-tree irrigation system
Over-tree irrigation is a classic application, and is very efficient against frost