||Yield Response of Head Lettuce ('Lactuca sativa' L.) to Ozone.
Temple, P. J. ;
Taylor, O. C. ;
Benoit, L. F. ;
||California Univ., Riverside. Statewide Air Pollution Research Center.;Corvallis Environmental Research Lab., OR.
Air pollution ;
Air pollution effects(Plants) ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Head lettuce (Lactuca sativa L. cv 'Empire') was grown in the field and exposed in open-top chambers to proportional increments of ozone (O3) from full charcoal filtration (CF) to twice ambient O3 concentrations(NF x 2.0). Severe foliar injury developed on young plants exposed to O3 concentrations 1.7 and 2.0 times greater than ambient (seasonal 7 hr means of 0.104 and 0.128 ppm, respectively). These exposure levels also reduced total head weight 13 and 35%, respectively, compared with CF plants. Marketable-sized head weight was reduced 21 and 80%, respectively. (Copyright (c) 1986 Pergamon Press Ltd.).