Abstract
Sweet corn, Zea mays L. Golden Midget and White Midget, were exposed to 0, 5, or 10 pphm ozone for 6 hr/day, from emergence to harvest, in field exposure chambers. Golden Midget was more sensitive to ozone than White Midget as indicated by the amount of visible injury and by reduction in growth and yield. Fresh weight of ears, number of kernels, and dry weight of kernels on plants receiving 10 pphm ozone were significantly reduced (5% level) with respect to the controls in Golden Midget but not in White Midget. Since the ozone levels used in this experiment were lower than those commonly found in the air surrounding many urban areas, the results suggest that measurable yield losses in corn due to air pollution may be greater than was previously recognized.
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