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    Loblolly pine (Pinus taeda L.) seedlings of five half-sib families were grown for 3 yr in the field in open-top chambers. The seedlings were fumigated during the growing seasons (approximately April-October) with ozone at the following target levels: subambient (CF), ambient (AMB), and ambient+ 60 ppb (AMB+). At the end of the three growing seasons, no significant ozone effects on diameter, height or total biomass of the seedlings were detected, and no statistically significant ozone-family interactions were detected. Analysis of growth trends suggest that drought during the second and third growing seasons may have interacted with the ozone treatments. The importance of long-term studies under realistic field conditions is discussed.

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    Adams, M.B.; Kelly, J.M.; Taylor, G.E., Jr.; Edwards, N.T. 1990. Growth of five families of Pinus taeda L. during three years of ozone exposure. New Phytologist. 116: 689-694.


    Ozone, loblolly pine, genotypic variations, drought effects

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