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- W2003707955 abstract "The effects of SO 2 (2 ppm for 6 h), O 3 (0.9 ppm for 5 h), and SO 2 –O 3 mixtures (2 ppm SO 2 and 0.9 ppm O 3 for 5 h followed by SO 2 for 1 h) were studied on injury and growth of 4-month-old, actively growing and quiescent Ulmus americana L. seedlings. In actively growing seedlings visible injury to leaves from SO 2 –O 3 mixtures was evident within 24 h; from O 3 within 36 to 48 h; and from SO 2 within 48 h after fumigation ceased. Sulfur dioxide and SO 2 –O 3 treatments reduced expansion of new leaves (< 1 cm long at time of fumigation) within 1 week, but normal rates of leaf expansion were restored by the end of the 2nd week. Ozone had no significant effect on expansion of new leaves. Expansion of young leaves (> 1 cm long at time of fumigation) was markedly inhibited by all treatments; it was inhibited most by SO 2 –O 3 , an intermediate amount by SO 2 , and least by O 3 . Numbers of emerging leaves were significantly reduced by SO 2 , and by SO 2 –O 3 , but only at the end of the 1st week. After 5 weeks, stem dry weights were reduced by O 3 and SO 2 –O 3 , and root dry weights were reduced by SO 2 and SO 2 –O 3 . In quiescent plants pollution injury to leaves was similar to that in actively growing plants. However, all fumigation treatments induced severe defoliation in quiescent plants." @default.
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- W2003707955 date "1979-01-15" @default.
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- W2003707955 title "Effects of sulfur dioxide and ozone on <i>Ulmus americana</i> seedlings. I. Visible injury and growth" @default.
- W2003707955 doi "https://doi.org/10.1139/b79-025" @default.
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