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Effects of the dust treatment with coal powder on the apple productivity were investigated from the plant eco-physiological point of view. Coal dust was applied at three levels ranging from 0 to 50g/㎡ of land area on the six trees of 18-year-old apple(Malus pumila, Mill) in the experiment orchard. To obtain more information about the growth analysis of dry matter productions by treated apple, two local cultivars, Jonathan and Ralls Genet, were determined in regard to seasonal changes of relative light intensities, leaf area indices and specific leaf areas o leaf population, growth of new shoot length and fruit diameter, and rates of fruit dropping and coloring during the growing period from April to October, 1974. Effects o the coal-dust pollution were rendered different pattern of plant reactions on above growth factors. Unlike the decreased results obtained in the light intensity under leaf population, an increase in the growth of leaf area was achieved by increasing coal-dust amount. However, a significant increase in the fruit dropping rate for Jonathan was observed with heavy (50g/㎡) treatment. (with 3 Tables and 4 Figs.)
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