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Low level ozone and or sulfur di oxide exposure causes a linear decline in soybean glycine max cultivar hark yield



Low level ozone and or sulfur di oxide exposure causes a linear decline in soybean glycine max cultivar hark yield



Environmental Pollution Series A Ecological & Biological 34(4): 345-356



A field fumigation system was used to expose unenclosed field-grown soybean plants G. max 'Hark' to low levels of O3 and/or SO2. A 3 .times. 3 factorial design was employed, allowing for analysis of individual effects of and potential interactions between the 2 pollutants. During the experiment ambient O3 was significant, but low (mean concentration of 0.04 .mu.l/l), and ambient SO2 were not detected. Plants were exposed to ambient air with or without additional pollutants for about 5 h/day on 16 days between Aug. 20 and Sept. 12, 1980. Exposure to greater than ambient levels of O3 (mean concentration of 0.06 or 0.08 .mu.l/l) caused significant linear reductions of 2-5% in mass per seed and number of seeds per pod, 17-25% in number of seeds and pods per plant and 10-25% in seed yield (dry mass) per plant and per hectare. Exposure to greater than ambient levels of SO2 (mean concentration of 0.06 to 0.11 .mu.l/l) caused significant linear reductions of 4-7% in mass per seed. High SO2 treatment (mean concentration of 0.11 .mu.l/l) also resulted in non-significant declines of 7-12% in yield per plant and per hectare. No significant interactions between the pollutants were observed and O3 had a several-fold greater impact on soybean than SO2 on either a concentration or a dose basis.

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Accession: 005834075

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