What we call radiation frost is a loss of heat during the night. It's also known as ground freezing. When that happens, sprinkler irrigation can be used to water crops. Since the water is warmer than the air, when it freezes, it releases heat. Therefore, if we water the crops as long as the frost lasts, we can keep the temperature of the plant at zero degrees, plus a few degrees, and save the fruits and the plant during another frost-free period.
On February 5th, 2018. See this statement in context.