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Published in Crop Sci 23:1184-1191 (1983)
© 1983 Crop Science Society of America
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Effects of Chronic Doses of Ozone and Sulfur Dioxide on Injury and Yield of Soybeans in Open-Top Field Chambers1

Allen S. Heagle, Walter W. Heck, John O. Rawlings and Robert B. Philbeck2

Soybeans, Glycine max (L.) Merr. ‘Davis’, were exposed for 7 h day–1 (111 days) to six concentrations of ozone (O3) and for 4 h day–1 (101 days) to four concentrations of sulfur dioxide (SO2), singly and in mixtures (24 combinations). The pollutant concentrations were selected to span those that occur in major soybean production areas of the USA. The pollutant dose-yield response relationships were modeled using regression analyses and a Weibull model analysis. Both analyses indicated that a dose of O3 typical for soybean production areas (seasonal 7—h day–1 mean of 0.055 ppm v/v) caused a seed weight decrease of 20% compared to a control dose of 0.025 ppm Oj. Sulfur dioxide at levels known to exist regionally in the USA (seasonal 4—h day–1 mean of <0.026 ppm SO2) did not cause injury or affect soybean yield. Neither pollutant changed the dose-response relationships for the other except at high concentrations where the effect of mixtures was less than the additive effects of the pollutants singly. The dose-response relationships were similar for each of two soil types.

Key Words: Glycine max • Air pollution stress

1 Cooperative investigations of the USDA-ARS and the North Carolina State Univ. Paper no. 8665 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh, NC 27650. Research partly supported by an Interagency Agreement between the Environmental Protection Agency and the USDA; Interagency agreement number AD-12-F-1-490-2.

2 Plant pathologist, USDA-ARS, Deps. of Plant Pathology and Crop Science; plant physiologist, USDA-ARS, Dep. of Botany; professor of statistics, Dep. of Statistics; and agricultural engineer; USDA ARS, North Carolina State Univ., Raleigh, NC 27650.

Received for publication December 27, 1982.




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