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The effects of ozone and nitrogen fertilizer on tall fescue festuca arundinacea cultivar kentucky 31 and ladino clover trifolium repens cultivar tillman and a fescue clover mixture 1. growth re growth and forage production



The effects of ozone and nitrogen fertilizer on tall fescue festuca arundinacea cultivar kentucky 31 and ladino clover trifolium repens cultivar tillman and a fescue clover mixture 1. growth re growth and forage production



Canadian Journal of Botany 60(12): 2745-2752



The effects of chronic ozone (O3) and (or) N fertilizer on growth, regrowth and forage production of ladino clover (T. repens L. cv. Tillman) and tall fescue (F. arundinaceae Schreb. cv. Kentucky 31) grown in pots separately and together in open-top chambers in the field were studied from April 27 to Oct. 19, 1979. Mean 7 h per day (0930 to 1630 EDT) O3 concentrations for this period were as follows: charcoal-filtered air chambers, 0.03 ppm; nonfiltered air chambers (NF-1), 0.05 ppm; nonfiltered air chambers with O3 added for 7 h per day (NF-2), 0.08 ppm; and ambient air, 0.05 ppm. Ozone reduced regrowth (milligrams of dry weight per plant per week) and total forage production of clover and the fescue-clover mixture. The magnitude of the reductions of clover growth and forage production corresponded in general in the O3 levels. Growth of fescue was not significantly modified by O3 treatments. N fertilization stimulated the growth of fescue but had little impact on the growth of clover. N fertilization did not change the response of either species to O3.

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