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FROSTPRO, a Model of Overhead Irrigation Rates for Frost/Freeze Protection of Apple Orchards


A BASIC microcomputer program, FROSTPRO, has been developed from existing literature (3) to calculate irrigation rates for frost/freeze protection of orchards based on given atmospheric and crop parameters. An energy budget approach was used to determine the rate of heat lost by the susceptible plant part through radiative, convective, and latent heat transfer processes at the actual plant part temperature and at the critical temperature, below which damage will occur. The difference between these 2 rates of heat loss is the rate at which heat must be added by the latent heat of fusion liberated as the applied water freezes. The model developed follows that previously described (2), with the addition of the relative humidity parameter.