Abstract
A heat transfer model is presented that predicts the temperature behavior of a heated cylinder of orchard soil [60-cm (24-in.) diameter ¥ 44-cm (17-in.) deep] that is to be the replant site for a new apple tree. The heat treatment is intended to pasteurize the soil by destroying pathogenic organisms that cause apple replant disease and thus enable more rapid growth of the new tree. The model is based on radial heat diffusion in the horizontal plane and slab diffusion in the vertical direction, using measured soil thermal properties. Good model agreement was obtained with measured soil temperatures at two different soil sites, indicating utility to pathologists for predicting temperature histories and death rates for various pathogens.
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