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THE EFFECTS OF OXIDANT AIR POLLUTANTS ON SOYBEANS, SNAP BEANS AND POTATOES
Heggestad, H., R. Howell, AND J. Bennett. THE EFFECTS OF OXIDANT AIR POLLUTANTS ON SOYBEANS, SNAP BEANS AND POTATOES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-77/128.
During the past 5 years the impact of photochemical oxidants on soybeans and snap beans in Maryland and on potatoes in Virginia and Delaware was assessed with open-top chambers. The mean yields of four selected soybean varieties grown in open-top chambers with carbon-filtered air and in plots without chambers were about the same. However, the mean yields of beans grown in chambers with nonfiltered air were significantly lower (about 20%). In experiments with snap beans at Beltsville, Maryland from 1972-1974, the bean yield from one of three varieties tested was decreased 14% by oxidants, whereas the other two varieties did not show a yield decrease. At Painter, Virginia, in 1975, three of four potato varieties showed a significant yield reduction (average 30%) in chambers with nonfiltered air as compared with filtered air.