Thresholds for Injury, Growth, and Yield Loss Caused by Ozone on Field Corn Hybrids

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Abstract
A commercial field corn (Zea mays L.) hybrid ''Coker 16'' was exposed to 4 chronic doses of O3 in open-top field chambers from 25 days after planting until maturity. The different doses were obtained by adding different but constant concentrations of O3 to the naturally varying ambient concentrations for 7 h day (0930-1630 h). The threshold O3 concentrations causing foliar injury (0.02-0.07 ppm) were lower than concentrations re2u to decrease kernel yield (0.11-0.15 ppm). These thersholds were the same whether plants were grown in pots or in the ground. In the greenhouse, the sensitivity of ''Coker 16'' to growth effects caused by chronic O3 exposures was intermediate to that of 2 open-pedigree hybrids. In the field, both open-pedigree hybrids were more sensitive than ''Coker 16''. Exposure to a mean O3 concentrations of 0.15 ppm for 7 h/day decreased kernel yield of the open-pedigree hybrids by 37-40%, but that of ''Coker 16'' was decreased by only 12%.

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