Method and Device for Protecting Fruit Trees and Crops from Freezing

摘要

The freezing of flowering fruit trees, vineyards and crops during cold spring nights causes important financial loss to the farmers in the moderate climate regions of the earth. Such freezing may occur upon dry atmospheric conditions, when the low moisture level of the atmosphere no longer provides a sufficient back-reflection of the earth's thermal radiation. Objects at the earth surface can then lose their thermal energy by radiation into outer space through the open atmospheric window. In particular, delicate leaves and flowers of trees and crops can then freeze, even if the earth surface temperature is still above 0℃. This effect is also known from car windows, whose temperature may drop below 0℃ during such night, even if the environment is still above 0℃.