Abstract
A factorial experiment in controlled environment chambers with three levels of ozone and four levels of sulphur dioxide was used to obtain response surfaces describing the effects of these pollutants on foliar injury and growth of ‘New Yorker’ tomato, ‘Maple Arrow’ soybean and ‘Golden Jubilee’ maize. Non-destructive covariate measurements were used to increase precision. The two pollutants usually did not act independently in their effects on the plants. All three species demonstrated an increase in foliar injury as the concentration of the two gases increased. Leaf area and leaf dry weight for both soybean and maize were increased at low to medium levels of pollutants and decreased at higher levels. Visible injury was greater than growth retardation on a percentage basis. Research of this kind is essential to the development of more efficient designs to evaluate interaction and dose-response patterns. Research projects are underway to determine the effects of seguential treatments with ozone and sulphur dioxide which may be more realistic than simultaneous treatments with these two gases in terms of ambient atmospheric chemical composition.
Published Version
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