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Ozone and Sulfur Dioxide-Induced Changes in Soybean Growth. R. A. Reinert, Plant pathologist, Agricultural Research, Science and Education Administration, U. S. Department of Agriculture, Department of Plant Pathology, North Carolina State University, Raleigh 27650; D. E. Weber, plant pathologist, Office of Research and Development, Energy Effects Division, U. S. Environmental Protection Agency, Washington, DC 20460. Phytopathology 70:914-916. Accepted for publication 15 March 1980. Copyright The American Phytopathological Society. DOI: 10.1094/Phyto-70-914.

The growth of soybean was inhibited by exposure to 490 μg O3/m3 (25 pphm) and 665 μg SO2/m3 (25 pphm), singly and in combination, when plants were exposed for 4 hr three times per week for 11 wk. The main effects of O3 were a reduction of shoot, root, and plant dry weight measured at 5, 7, 9, and 11 wk. The main effects of SO2 were a reduction of shoot dry weight at 7 wk and total plant growth at 11 wk. Sulfur dioxide contributed to the reduced growth in soybean in the absence of visible SO2 injury. The effect of SO2 and O3 in combination on soybean growth was only additive. Treatments containing O3 reduced the numbers and dry weight of root nodules of soybean, compared with treatments without O3.

Additional keywords: Glycine max, air pollution, pollutant interaction.