Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Covariate Measurements for Increasing the Precision of Plant Response to O3 and SO2.
Author Ormrod, D. P. ; Tingey, D. T. ; Gumpertz, M. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Guelph Univ. (Ontario). Dept. of Horticultural Science. ;Northrop Services Inc., Corvallis, OR.
Year Published 1983
Report Number EPA-600/J-83-193;
Stock Number PB84-177542
Additional Subjects Plants(Botany) ; Ozone ; Sulfur dioxide ; Air pollution ; Plant growth ; Radish ; Lettuce ; Exposure ; Harvesting ; Farm crops ; Reprints ; Baseline measurements
Library Call Number Additional Info Location Last
NTIS  PB84-177542 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 6p
Lettuce (Lactuca sativa L. ev. Grand Rapids) and radish (Raphanus sativus L. cv. Cherry Belle) plants growing at baseline environmental conditions were exposed to charcoal-filtered air, 0.40 ppm (v/v) ozone, and 0.80 ppm sulfur dioxide alone or in combination for 6 hours at 14 days from seeding. Analysis of covariance was used to account for significant within-treatment variation in plant growth. Covariates used were: planar leaf area (PLA) at 14 days for leaf area, fresh weight, and dry weight, and dry weight at harvest; plastochron index (PI) at 14 days for PI at harvest; and hypocotyl diameter for hypocotyl weights of radish roots at harvest. The covariates reduced the variability (Standard geometric errors) of the response variables and increased the precision of statistical tests substantially for lettuce but much less for radish. For lettuce, the effect of the gas mixture on plant growth and foliar injury was less severe than that of the single gases. Radish plants, in contrast, exhibited no response to SO2 and the effects of O3 and the mixture on foliar injury and plant growth were similar.