Four soybean cultivars ( Glycine max (L.) Merr. cv. Forrest, Davis, Ransom, and Bragg) differing in foliar sensitivity and shoot weight response to O 3 during vegetative growth were exposed to O 3 from the seedling stage to maturity to determine if the yield response correlated with the vegetative response. Neither the foliar injury nor the vegetative shoot weight response of cultivars to O 3 allowed reasonable prediction of the cultivar yield response to O 3 . This inadequacy may relate to differences in cultivar tolerance. Bragg, with moderate amounts of O 3 ‐induced injury and with decreased growth, yielded as well as the controls. Davis, with moderate amounts of O 3 ‐induced injury and decreased growth, yielded 34% less than the controls. The four cultivars were grown in open‐top field chambers with different degrees of shading to determine whether light intensity would alter their response to O 3 . Light intensity in nonshaded open‐top chambers was 9% less than that in an open field; chambers with shade cloth covering the sides or tops decreased light intensity by 15 and 19%, respectively. The shade treatments did not change overall yield response to O 3 or the relative cultivar yield response to O 3 .
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Heagle et al. (1982) studied this question.