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Effects of Chronic Exposure to Simulated Power Plant Emissions and Ozone in Soybean Production

Fisheries and Aquatic Biology Branch, Tennessee Valley Authority, Knoxville, TN 37902;

J. C. Noggle and Charlie McDuffie, Jr.^*

Air Quality Branch, 204 Chemical Eng. Bldg., TVA, Muscle Shoals, AL 35660.

^* Corresponding author.

ABSTRACT

Acute SO₂ effects on vegetation are less likely because large point sources comply with ambient air quality standards and emission limits. The remaining concern is for direct effects of SO₂, which might occur from exposure to intermittent, subacute dosages. Limited data exist for assessing chronic effects because experimental exposure regimes used in most effect studies on soybean [Glycine max. (L.) Merr.] are from field and laboratory exposure regimes consisting of SO₂, NO₂, and O₃ dosages with a high degree of uncertainty. Chronic exposure of ‘Essex’ soybean to 0.06 µL L^–1 (0.06 ppm) O₃ for 8 h d^–1, 5 d wK^+–1, for 18 wk in the greenhouse caused a 34% reduction in yield compared to charcoal-filtered air. Sulfur dioxide in combination with O₃ and NO₂ caused no additional reduction in yield, but lower dosages of SO₂ increased yields compared to the O₃ treatment, apparently by retarding O₃-induced premature senescence. Emissions from a power plant had no adverse effect on yield on the cultivar Essex during a 3-yr field study (1981–1983).

(retired)

Contribution to the Tennessee Valley Authority, Air Quality Branch, Muscle Shoals, AL.

This research was funded by a grant from the USEPA and TVA Office of Power.

Received for publication September 8, 1987.